UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ý	Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended December 31, 2017

OR

¨	Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from             to

Commission file number 033-90866

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

(Exact name of registrant as specified in its charter) 

Delaware	25-1615902
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

1001 Air Brake Avenue Wilmerding, Pennsylvania 15148	(412) 825-1000
(Address of principal executive offices, including zip code)	(Registrant’s telephone number)

Securities registered pursuant to Section 12(b) of the Act:

Title of Class	Name of Exchange on which registered
Common Stock, par value $.01 per share	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None 

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ý    No  ¨.

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    Yes  ¨    No  ý.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)    Yes  ý    No   ¨.

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    ý.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x	Accelerated filer	¨	Non-accelerated filer	¨	(Do not check if smaller reporting company)
Emerging growth company	¨	Smaller reporting company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨  

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act.    Yes  ¨    No  ý.

The registrant estimates that as of June 30, 2017, the aggregate market value of the voting shares held by non-affiliates of the registrant was approximately $7.8 billion based on the closing price on the New York Stock Exchange for such stock.

As of February 16, 2018, 96,090,518 shares of Common Stock of the registrant were issued and outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the Proxy Statement for the registrant’s Annual Meeting of Stockholders to be held on May 7, 2018 are incorporated by reference into Part III of this Form 10-K.

---

TABLE OF CONTENTS

 

		Page
	PART I
Item 1.	Business	3
Item 1A.	Risk Factors	11
Item 1B.	Unresolved Staff Comments	15
Item 2.	Properties	16
Item 3.	Legal Proceedings	17
Item 4.	Mine Safety Disclosures	17
	Executive Officers of the Registrant	18
	PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	20
Item 6.	Selected Financial Data	22
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	40
Item 8.	Financial Statements and Supplementary Data	40
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	40
Item 9A.	Controls and Procedures	41
Item 9B.	Other Information	41
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	42
Item 11.	Executive Compensation	42
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	42
Item 13.	Certain Relationships and Related Transactions, and Director Independence	42
Item 14.	Principal Accountant Fees and Services	42
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	43
Item 16.	Form 10-K Summary	96

2

---

PART I

Item  1.	BUSINESS

General

Westinghouse Air Brake Technologies Corporation, doing business as Wabtec Corporation, is a Delaware corporation with headquarters at 1001 Air Brake Avenue in Wilmerding, Pennsylvania. Our telephone number is 412-825-1000, and our website is located at www.wabtec.com. All references to “we”, “our”, “us”, the “Company” and “Wabtec” refer to Westinghouse Air Brake Technologies Corporation and its consolidated subsidiaries. George Westinghouse founded the original Westinghouse Air Brake Co. in 1869 when he invented the air brake. Westinghouse Air Brake Company (“WABCO”) was formed in 1990 when it acquired certain assets and operations from American Standard, Inc., now known as Trane (“Trane”). The company went public on the New York Stock Exchange in 1995. In 1999, WABCO merged with MotivePower Industries, Inc. and adopted the name Wabtec.

In 2017, Wabtec completed the acquisition of Faiveley Transport, S.A. (“Faiveley Transport”), a leading provider of value-added, integrated systems and services, primarily for the global transit rail market, for a purchase price of approximately $1.5 billion. Based in France, Faiveley Transport has roots to 1919 and became a leader in manufacturing pantographs, automatic door mechanisms and air conditioning systems. Faiveley Transport was listed on the Paris Stock Exchange in 1994 and during the next 20 years acquired a number of rail industry leaders including Sab Wabco, a specialist in railway braking systems and couplers. Wabtec believes that the acquisition of Faiveley Transport provides the following strategic benefits:

•	Increased diversity of revenues by product, geography and market. A majority of Faiveley Transport’s revenues are outside the U.S. and in the transit market, which helps to balance the cyclicality of our North American freight business.

•	Broadened product line. Faiveley Transport provides many products that we did not previously offer, including braking and door systems for high-speed trains and air conditioning systems.

•	Expanded international presence in the transit market. A majority of Faiveley Transport’s revenues come from transit markets outside the U.S., where we previously did not have a strong presence.

•	Increased technical and engineering expertise. Faiveley Transport strengthens Wabtec's technical capabilities and product development efforts.

Today, we are one of the world’s largest providers of value-added, technology-based equipment, systems and services for the global passenger transit and freight rail industries. We believe we hold a leading market share for many of our core product lines globally. Our highly engineered products, which are intended to enhance safety, improve productivity and reduce maintenance costs for customers, can be found on most locomotives, freight cars, passenger transit cars and buses around the world. In 2017, the Company had sales of approximately $3.9 billion and net income attributable to our shareholders of about $262.3 million. In 2017, sales of aftermarket parts and services represented about 56% of total sales, while sales to customers outside of the U.S. accounted for about 66% of total sales.

Industry Overview

The Company primarily serves the global passenger transit and freight rail industries. As such, our operating results are largely dependent on the level of activity, financial condition and capital spending plans of passenger transit agencies and freight railroads around the world, and transportation equipment manufacturers who serve those markets. Many factors influence these industries, including general economic conditions; traffic volumes, as measured by freight carloadings and passenger ridership; government spending on public transportation; and investment in new technologies. In general, trends such as increasing urbanization and growth in developing markets, a focus on sustainability and environmental awareness, increasing investment in technology solutions, an aging equipment fleet, and growth in global trade are expected to drive continued investment in passenger transit and freight rail.

According to the 2016 bi-annual edition of a market study by UNIFE, the Association of the European Rail Industry, the accessible global market for railway products and services was more than $100 billion, and was expected to grow at about 3.2% annually through 2021. The three largest geographic markets, which represented about 80% of the total accessible market, were Europe, North America and Asia Pacific. UNIFE projected above-average growth in Asia Pacific and Europe due to overall economic growth and trends such as urbanization and increasing mobility, deregulation, investments in new technologies, energy and environmental issues, and increasing government support. The largest product segments of the market were rolling stock, services and infrastructure, which represent almost 90% of the accessible market. UNIFE projected spending on rolling stock to grow at an above-average rate due to increased investment in passenger transit vehicles. UNIFE estimated that the global installed base of locomotives was about 114,000 units, with about 32% in Asia Pacific, about 25% in North America and about 18% in Russia-CIS (Commonwealth of Independent States).  Wabtec estimates that about 2,600 new

3

---

locomotives were delivered worldwide in 2017, and we expect deliveries of about 2,700 in 2018. UNIFE estimated the global installed base of freight cars was about 5.5 million units, with about 37% in North America, about 26% in Russia-CIS and about 20% in Asia Pacific. Wabtec estimates that about 155,000 new freight cars were delivered worldwide in 2017, and it expects deliveries of about 148,000 in 2018.  UNIFE estimated the global installed base of passenger transit vehicles to be about 569,000 units, with about 43% in Asia Pacific, about 32% in Europe and about 14% in Russia-CIS. Wabtec estimates that about 34,000 new passenger transit vehicles were delivered worldwide in 2017, and we expect deliveries of about 44,000 in 2018.

In Europe, the majority of the rail system serves the passenger transit market, which is expected to continue growing as energy and environmental factors encourage continued investment in public mass transit. According to UNIFE, France, Germany and the United Kingdom were the largest Western European transit markets, representing almost two-thirds of industry spending in the European Union. UNIFE projected the Western European rail market to grow at about 3.6% annually, led by investments in new rolling stock in France and Germany.  Significant investments were also expected in Turkey, the largest market in Eastern Europe. About 75% of freight traffic in Europe is hauled by truck, while rail accounts for about 20%. The largest freight markets in Europe are Germany, Poland and the United Kingdom. In recent years, the European Commission has adopted a series of measures designed to increase the efficiency of the European rail network by standardizing operating rules and certification requirements. UNIFE believes that adoption of these measures should have a positive effect on ridership and investment in public transportation over time.

In North America, railroads carry about 40% of intercity freight, as measured by ton-miles, which is more than any other mode of transportation. Through direct ownership and operating partnerships, U.S. railroads are part of an integrated network that includes railroads in Canada and Mexico, forming what is regarded as the world’s most-efficient and lowest-cost freight rail service. There are more than 500 railroads operating in North America, with the largest railroads, referred to as “Class I,” accounting for more than 90% of the industry’s revenues. The railroads carry a wide variety of commodities and goods, including coal, metals, minerals, chemicals, grain, and petroleum.  These commodities represent about 50% of total rail carloadings, with intermodal carloads accounting for the rest. Railroads operate in a competitive environment, especially with the trucking industry, and are always seeking ways to improve safety, cost and reliability. New technologies offered by Wabtec and others in the industry can provide some of these benefits. Demand for our freight related products and services in North America is driven by a number of factors, including rail traffic, and production of new locomotives and new freight cars.  In the U.S., the passenger transit industry is dependent largely on funding from federal, state and local governments, and from fare box revenues. Demand for North American passenger transit products is driven by a number of factors, including government funding, deliveries of new subway cars and buses, and ridership. The U.S. federal government provides money to local transit authorities, primarily to fund the purchase of new equipment and infrastructure for their transit systems.

Growth in the Asia Pacific market has been driven mainly by the continued urbanization of China and India, and by investments in freight rail rolling stock and infrastructure in Australia to serve its mining and natural resources markets. India is making significant investments in rolling stock and infrastructure to modernize its rail system; for example, the country has awarded a 1,000-unit locomotive order to a U.S. manufacturer. UNIFE expected the increased spending in India to offset decreased spending on very-high-speed rolling stock in China.

Other key geographic markets include Russia-CIS and Africa-Middle East.  With about 1.4 million freight cars and about 20,000 locomotives, Russia-CIS is among the largest freight rail markets in the world, and it’s expected to invest in both freight and transit rolling stock. PRASA, the Passenger Rail Agency of South Africa, is expected to continue to invest in new transit cars and new locomotives. According to UNIFE, emerging markets were expected to grow at above-average rates as global trade led to increased freight volumes and urbanization led to increased demand for efficient mass-transportation systems. As this growth occurs, Wabtec expects to have additional opportunities to provide products and services in these markets.

In its study, UNIFE also said it expected increased investment in digital tools for data and asset management, and in rail control technologies, both of which would improve efficiency in the global rail industry. UNIFE said data-driven asset management tools have the potential to reduce equipment maintenance costs and improve asset utilization, while rail control technologies have been focused on increasing track capacity, improving operational efficiency and ensuring safer railway traffic. Wabtec offers products and services to help customers make ongoing investments in these initiatives.

Business Segments and Products

We provide our products and services through two principal business segments, the Transit Segment and the Freight Segment, both of which have different market characteristics and business drivers. The acquisition of Faiveley Transport significantly strengthened our capabilities and presence in the worldwide transit market.

The Transit Segment, primarily manufactures and services components for new and existing passenger transit vehicles, typically regional trains, high speed trains, subway cars, light-rail vehicles and buses; supplies rail control and infrastructure

4

---

products including electronics, positive train control equipment, and signal design and engineering services; builds new commuter locomotives; and refurbishes passenger transit vehicles. Customers include public transit authorities and municipalities, leasing companies, and manufacturers of passenger transit vehicles and buses around the world. Demand in the transit market is primarily driven by general economic conditions, passenger ridership levels, government spending on public transportation, and investment in new rolling stock. In 2017, the Transit Segment accounted for 64% of our total sales, with about 21% of its sales in the U.S. About two-thirds of the Transit Segment’s sales are in the aftermarket with the remainder in the original equipment market. The addition of Faiveley Transport’s key products strengthened Wabtec's presence in the following areas: high-speed braking and door systems; heating, ventilation and air conditioning systems; pantographs and power collection; information systems; platform screen doors and gates; couplers; and aftermarket services, maintenance and spare parts. Geographically, Faiveley Transport significantly strengthened Wabtec’s presence in the European and Asia Pacific transit markets.

The Freight Segment primarily manufactures and services components for new and existing locomotives and freight cars; supplies rail control and infrastructure products including electronics, positive train control equipment, and signal design and engineering services; overhauls locomotives; and provides heat exchangers and cooling systems for rail and other industrial markets. Customers include large, publicly traded railroads, leasing companies, manufacturers of original equipment such as locomotives and freight cars, and utilities. Demand is primarily driven by general economic conditions and industrial activity; traffic volumes, as measured by freight carloadings; investment in new technologies; and deliveries of new locomotives and freight cars. In 2017, the Freight Segment accounted for 36% of our total sales, with about 58% of its sales in the U.S. In 2017, slightly more than half of the Freight Segment’s sales were in the aftermarket.

Following is a summary of our leading product lines in both aftermarket and original equipment across both of our business segments:

Specialty Products & Electronics:

•	Positive Train Control equipment and electronically controlled pneumatic braking products

•	Railway electronics, including event recorders, monitoring equipment and end of train devices

•	Signal design and engineering services

•	Freight car trucks and couplers

•	Draft gears, couplers and slack adjusters

•	Air compressors and dryers

•	Heat exchangers and cooling products for locomotives and power generation equipment

•	Track and switch products

Brake Products:

•	Railway braking equipment and related components for Freight and Transit applications, including high-speed passenger transit vehicles

•	Friction products, including brake shoes, discs and pads

Remanufacturing, Overhaul and Build:

•	New commuter and switcher locomotives

•	Transit car and locomotive overhaul and refurbishment

Transit Products:

•	Heating, ventilation and air conditioning equipment

•	Doors for buses and subway cars

•	Platform screen doors

•	Pantographs

•	Window assemblies

•	Couplers

•	Accessibility lifts and ramps for buses and subway cars

•	Traction motors

5

---

We have become a leader in the passenger transit and freight rail industries by capitalizing on the strength of our existing products, technological capabilities and new product innovations, and by our ability to harden products to protect them from severe conditions, including extreme temperatures and high-vibration environments. Supported by our technical staff of over 2,300 engineers and specialists, we have extensive experience in a broad range of product lines, which enables us to provide comprehensive, systems-based solutions for our customers.

In recent years, we have introduced a number of significant new products, including Positive Train Control (“PTC”) equipment that encompasses onboard digital data and global positioning communication protocols. We are making additional investments in this technology which we believe will provide customers with opportunities to improve safety and efficiency, in part through data analytics solutions. Other new products include HVAC inverter integrated solutions, brake discs and brake controls, platform doors and gates, and door controllers.

For additional information on our business segments, see Note 20 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

Competitive Strengths

Our key strengths include:

•

Leading market positions in core products. Dating back to 1869 and George Westinghouse’s invention of the air brake, we are an established leader in the development and manufacture of pneumatic braking equipment for freight and passenger transit vehicles. Faiveley Transport, founded nearly 100 years ago, has a long history and is a market leader for its core products, including pantographs, automatic door mechanisms and air conditioning systems. We have leveraged our leading positions by focusing on research and engineering to expand beyond pneumatic braking components to supplying integrated parts and assemblies for the locomotive through the end of the train. We are a recognized leader in the development and production of electronic recording, measuring and communications systems, positive train control equipment, highly engineered compressors and heat exchangers for locomotives, and a leading manufacturer of freight car components, including electronic braking equipment, draft gears, trucks, brake shoes and electronic end-of-train devices. We are also a leading provider of braking equipment; heating, ventilation and air conditioning equipment; door assemblies and platform screen doors; lifts and ramps; couplers and current collection equipment, such as pantographs, for passenger transit vehicles.

•

Breadth of product offering with a stable mix of original equipment market (OEM) and aftermarket business. Our product portfolio is one of the broadest in the rail industry, as we offer a wide selection of quality parts, components and assemblies across the entire train and worldwide. We provide our products in both the original equipment market and the aftermarket. Our substantial installed base of products with end-users such as the railroads and the passenger transit authorities is a significant competitive advantage for providing products and services to the aftermarket because these customers often look to purchase safety- and performance-related replacement parts from the original equipment components supplier. In addition, as OEMs and railroad operators attempt to modernize fleets with new products designed to improve and maintain safety and efficiency, these products must be designed to be interoperable with existing equipment. On average, over the last several years, about 60% of our total net sales have come from our aftermarket products and services business.

•

Leading design and engineering capabilities. We believe a hallmark of our relationship with our customers has been our leading design and engineering practice, which has, in our opinion, assisted in the improvement and modernization of global railway equipment. We believe both our customers and the government authorities value our technological capabilities and commitment to innovation, as we seek not only to enhance the efficiency and profitability of our customers, but also to improve the overall safety of the railways through continuous improvement of product performance. The Company has an established record of product improvements and new product development. We have assembled a wide range of patented products, which we believe provides us with a competitive advantage. Wabtec currently owns 3,135 active patents worldwide. During the last three years, we have filed for approximately 450 patents worldwide in support of our new and evolving product lines.

•

Experience with industry regulatory requirements. The freight rail and passenger transit industries are governed by various government agencies and regulators in each country and region. These groups mandate rigorous manufacturer certification, new product testing and approval processes that we believe are difficult for new entrants to meet cost-effectively and efficiently without the scale and extensive experience we possess. Certification processes are lengthy, and often require local presence and expertise. In addition, each transit agency places a high degree of importance on vehicle customization, which requires experience and technical expertise to meet ever-evolving specifications.

•	Experienced management team and the Wabtec Excellence Program (WEP) Wabtec’s lean manufacturing and continuous improvement initiatives have been a part of the Company’s culture for more than 25 years and have enabled Wabtec to manage successfully through cycles in the rail supply market. With the acquisition of Faiveley Transport

6

---

(see Note 3 of "Notes to Consolidated Financial Statements" for further details), which introduced its Worldwide Excellence Program several years ago, we have combined the best practices of both organizations into WEP. We expect WEP will not only drive a successful integration of Wabtec and Faiveley Transport, but will also result in a reduced cost structure and ensure standardized excellence in all processes. We believe that using WEP as our operational foundation will foster state-of-the-art processes and continuous improvement, promote a constant pursuit of quality, and drive practical innovations and best-in-class, modern manufacturing.

Business strategy

Using WEP, we strive to generate sufficient cash to invest in our growth strategies and to build on what we consider to be a leading position as a low-cost producer in the industry while maintaining world-class product quality, technology and customer responsiveness. Through WEP and employee-directed initiatives such as Kaizen, a Japanese-developed team concept, we continuously strive to improve quality, delivery and productivity, and to reduce costs utilizing global sourcing and supply chain management. These practices enable us to streamline processes, improve product reliability and customer satisfaction, reduce product cycle times and respond more rapidly to market developments. We also rely on functional experts within the company across various disciplines to train, coach and share best practices throughout the corporation, while benchmarking against best-in-class competitors and peers. Over time, we believe the principles of WEP will enable us to continue to increase operating margins, improve cash flow and strengthen our ability to invest in the following growth strategies:

•

Product innovation and new technologies. We continue to emphasize innovation and development funding to create new products and capabilities, such as vehicle monitoring and data analytics. WabtecONE is a multi-year initiative to ensure that we continue to build on our existing expertise and technologies in electronics. In addition, we invest in developing enhancements and new features to existing products, such as brake discs and heat exchangers. We are focusing on technological advances, especially in the areas of electronics, braking products and other on-board equipment, as a means to deliver new product growth. We seek to provide customers with incremental technological advances that offer immediate benefits with cost-effective investments.

•

Global and market expansion. We believe that international markets represent a significant opportunity for future growth. In 2017, sales to non-U.S. customers were approximately $2.6 billion. We intend to increase international sales through direct sales of existing products to current and new customers, by developing specific new products for application in new geographic markets, by making strategic acquisitions and through joint ventures with railway suppliers which have a strong presence in their local markets. In transit, we are focused on mature markets such as Europe and emerging markets such as India. In freight, we are targeting markets that operate significant fleets of U.S.-style locomotives and freight cars, including Australia, Brazil, China, India, Russia, South Africa, and other select areas within Europe and South America. In addition, we have opportunities to increase the sale of certain products that we currently manufacture for the rail industry into other industrial markets, such as mining, off-highway and energy. These products include heat exchangers and friction materials.

•

Aftermarket products and services. Historically, aftermarket sales are less cyclical than OEM sales because a certain level of aftermarket maintenance and service work must be performed, even during an industry slowdown. In 2017, Wabtec’s aftermarket sales and services represented approximately 56% of the Company’s total sales across both of our business segments. As a long time supplier of original equipment, we have an extensive installed base of equipment in the field, which generates recurring aftermarket sales. Wabtec provides aftermarket parts and services for its components, and we seek to expand this business with customers who currently perform the work in-house. In this way, we expect to benefit as transit authorities and railroads outsource certain maintenance and overhaul functions.

•

Acquisitions, joint ventures and alliances. We invest in acquisitions, joint ventures and alliances using a disciplined, selective approach and rigorous financial criteria. These transactions are expected to meet our financial criteria and contribute to growth strategies of product innovation and new technologies, global expansion, and aftermarket products and services. We believe these expansion strategies will help Wabtec to grow profitably, expand geographically, and dampen the impact from potential cycles in the North American freight rail industry.

Recent Acquisitions and Joint Ventures

See Note 3 of the Notes to Consolidated Financial Statements

7

---

Backlog

The Company’s backlog was about $4.6 billion at December 31, 2017. For 2017, about 56% of total sales came from aftermarket orders, which typically carry lead times of less than 30 days, and are not recorded in backlog for a significant period of time.

The Company’s contracts are subject to standard industry cancellation provisions, including cancellations on short notice or upon completion of designated stages. Generally, if a customer were to cancel a contract we would have an enforceable right to payment for work completed up to the date of cancellation which would include a reasonable profit margin. Substantial scope-of-work adjustments are common. For these and other reasons, completion of the Company’s backlog may be delayed or canceled. The railroad industry, in general, has historically been subject to fluctuations due to overall economic conditions and the level of use of alternative modes of transportation.

The backlog of firm customer orders as of December 31, 2017 and December 31, 2016, and the expected year of completion are as follows:

		Total				Expected Delivery								Total				Expected Delivery
		Backlog								Other				Backlog								Other
In thousands		12/31/2017				2018				Years				12/31/2016				2017				Years
Freight Segment		$	549,188			$	423,805			$	125,383			$	575,931			$	396,160			$	179,771
Transit Segment		4,050,460				1,891,079				2,159,381				3,405,561				1,565,519				1,840,042
Total		$	4,599,648			$	2,314,884			$	2,284,764			$	3,981,492			$	1,961,679			$	2,019,813

Engineering and Development

To execute our strategy to develop new products, we invest in a variety of engineering and development activities. For the fiscal years ended December 31, 2017, 2016, and 2015, we invested about $95.2 million, $71.4 million and $71.2 million, respectively, on product development and improvement activities. The engineering resources of the Company are allocated between research and development activities and the execution of original equipment customer contracts. Across the corporation we have established multiple Centers of Competence, which have specialized, technical expertise in various disciplines and product areas.

Our engineering and development program includes investments in data analytics, train control and other new technologies, with an emphasis on developing products that enhance safety, productivity and efficiency for our customers. For example, we have developed advanced cooling systems that enable lower emissions from diesel engines used in rail and other industrial markets.  Sometimes we conduct specific research projects in conjunction with universities, customers and other industry suppliers.

We use our Product Development System to develop and monitor new product programs. The system requires the product development team to follow consistent steps throughout the development process, from concept to launch, to ensure the product will meet customer expectations and internal profitability targets.

Positive Train Control ("PTC")

PTC is a collision-avoidance system that uses GPS to monitor and control the movement of passenger and freight trains. In 2008, the U.S. mandated the use of PTC on a majority of the locomotives and track in the U.S. The Federal Railroad Administration ("FRA") eventually approved the use of Wabtec’s Electronic Train Management System® as the on-board locomotive standard for the deployment of this technology. Our system includes an on-board locomotive computer and related software. The deadline to implement this technology is December 31, 2018, and we are working with the U.S. Class I railroads, commuter rail authorities and other industry suppliers to meet this deadline. Under certain conditions, the deadline could be extended through 2019 and 2020. In 2017, Wabtec recorded about $322 million of revenue from freight and transit train control and signaling projects, which includes PTC.

Intellectual Property

We have 3,135 active patents worldwide and on average file for approximately 150 new patents each year. We also rely on a combination of trade secrets and other intellectual property laws, nondisclosure agreements and other protective measures to establish and protect our proprietary rights in our intellectual property. We also follow the product development practices of our competitors to monitor any possible patent infringement by them, and to evaluate their strategies and plans.

Certain trademarks, among them the name WABCO®, were acquired or licensed from American Standard Inc., now known as Trane, in 1990 at the time of our acquisition of the North American operations of the Railway Products Group of Trane. Other trademarks have been developed through the normal course of business, or acquired as a part of our ongoing merger and acquisition program.

8

---

We have entered into a variety of license agreements as licensor and licensee. We do not believe that any single license agreement is of material importance to our business or either of our business segments as a whole.

We have issued licenses to the two sole suppliers of railway air brakes and related products in Japan, Nabtesco and Mitsubishi Electric Company. The licensees pay annual license fees to us and also assist us by acting as liaisons with key Japanese passenger transit vehicle builders for projects in North America. We believe that our relationships with these licensees are beneficial to our core transit business and customer relationships in North America.

Customers

We provide products and services for more than 500 customers worldwide. Our customers include passenger transit authorities and railroads throughout North America, Europe, Asia Pacific, South Africa and South America; manufacturers of transportation equipment, such as locomotives, freight cars, passenger transit vehicles and buses; and companies that lease and maintain such equipment.

Top customers can change from year to year. For the fiscal year ended December 31, 2017, our top five customers accounted for approximately 18% of net sales: Bombardier, Inc., Alstom, the Greenbrier Companies, Siemens and Union Pacific Corporation. No one customer represents 10% or more of consolidated sales. We believe that we have strong relationships with all of our key customers.

Competition

We believe we hold a leading market share for many of our core product lines globally, although market shares vary by product lines and geographies. We operate in a highly competitive marketplace. Price competition is strong because we have a relatively small number of customers and they are very cost-conscious. In addition to price, competition is based on product performance and technological leadership, quality, reliability of delivery, and customer service and support.

Our principal competitors vary across product lines and geographies. Within North America, New York Air Brake Company, a subsidiary of the German air brake producer Knorr-Bremse AG (“Knorr”) and Amsted Rail Company, Inc., a subsidiary of Amsted Industries Corporation, are our principal overall OEM competitors. Our competition for locomotive, freight and passenger transit service and repair is mostly from the railroads’ and passenger transit authorities’ in-house operations, Electro-Motive Diesel, a division of Caterpillar, GE Transportation Systems, and New York Air Brake/Knorr. We believe our key strengths, which include leading market positions in core products, breadth of product offering with a stable mix of OEM and aftermarket business, leading design and engineering capabilities, significant barriers to entry and an experienced management team, enable us to compete effectively in this marketplace. Outside of North America, Knorr is our main competitor, although not in every product line or geography. In addition, our competitors often include smaller, local suppliers in most international markets. Depending on the product line and geography, we can also compete with our customers, such as CRRC Corporation Limited, a China-based manufacturer of rolling stock.

Employees

At December 31, 2017, we employed approximately 18,000 full-time employees around the world. This figure includes employees subject to collective bargaining agreements, most of which are outside of North America. We consider our relations with employees and union representatives to be good, but cannot assure that future contract negotiations and labor relations will be favorable to us.

Regulation

In the course of our operations, we are subject to various regulations and standards of governments and other agencies in the U.S. and around the world. These entities typically govern equipment, safety and interoperability standards for passenger transit and freight rail rolling stock, oversee a wide variety of rules and regulations governing safety and design of equipment, and evaluate certification and qualification requirements for suppliers.  New products generally must undergo testing and approval processes that are rigorous and lengthy. As a result of these regulations and requirements, we must usually obtain and maintain certifications in a variety of jurisdictions and countries.  The governing bodies include the FRA and the Association of American Railroads ("AAR") in the U.S., and the International Union of Railways (“UIC”) and the European Railway Agencies in Europe. Also in Europe, the European Committees for Standardization continually draft new European standards which cover, for example, the Reliability, Availability, Maintainability and Safety of railways systems. To guarantee interoperability in Europe, the European Union for Railway Agencies is responsible for defining and implementing Technical Standards of Interoperability, which covers areas such as infrastructure, energy, rolling stock, telematic applications, traffic operation and management subsystems, noise pollution and waste generation, protection against fire and smoke, and system safety.

9

---

Most countries and regions in which Wabtec does business have similar rule-making bodies. In Russia, a GOST-R certificate of conformity is mandatory for all products related to the safety of individuals on Russian territory. In China, any product or system sold on the Chinese market must have been certified in accordance with national standards. In the local Indian market, most products are covered by regulations patterned after AAR and UIC standards.

Effects of Seasonality

Our business is not typically seasonal. The third quarter results may be affected by vacation and scheduled plant shutdowns at several of our major customers and fourth quarter results may be affected by the timing of spare parts and service orders placed by transit agencies worldwide. Quarterly results can also be affected by the timing of projects in backlog and by project delays.

Environmental Matters

Additional information on environmental matters is included in Note 19 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

Available Information

We maintain a website at www.wabtec.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to such reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as well as the annual report to stockholders and other information, are available free of charge on this site. The Internet site and the information contained therein or connected thereto are not incorporated by reference into this Form 10-K. The following are also available free of charge on this site and are available in print to any shareholder who requests them: Our Corporate Governance Guidelines, the charters of our Audit, Compensation and Nominating and Corporate Governance Committees, our Code of Conduct, which is applicable to all employees, our Code of Ethics for Senior Officers, which is applicable to our executive officers, our Policies on Related Party Transactions and Conflict Minerals, and our Sustainability Report.

10

---

Item 1A.	RISK FACTORS

Prolonged unfavorable economic and market conditions could adversely affect our business.

Unfavorable general economic and market conditions in the United States and internationally could have a negative impact on our sales and operations. To the extent that these factors result in continued instability of capital markets, shortages of raw materials or component parts, longer sales cycles, deferral or delay of customer orders or an inability to market our products effectively, our business and results of operations could be materially adversely affected.

We are dependent upon key customers.

We rely on several key customers who represent a significant portion of our business. Our top customers can change from year to year. For the fiscal year ended December 31, 2017, our top five customers accounted for approximately 18% of our net sales. While we believe our relationships with our customers are generally good, our top customers could choose to reduce or terminate their relationships with us. In addition, many of our customers place orders for products on an as-needed basis and operate in cyclical industries. As a result, their order levels have varied from period to period in the past and may vary significantly in the future. Such customer orders are dependent upon their markets and customers, and may be subject to delays and cancellations. As a result of our dependence on our key customers, we could experience a material adverse effect on our business, results of operations and financial condition if we lost any one or more of our key customers or if there is a reduction in their demand for our products.

Our business operates in a highly competitive industry.

We operate in a global, competitive marketplace and face substantial competition from a limited number of established competitors, some of which may have greater financial resources than we do. Price competition is strong and, coupled with the existence of a number of cost conscious customers, has historically limited our ability to increase prices. In addition to price, competition is based on product performance and technological leadership, quality, reliability of delivery and customer service and support. There can be no assurance that competition in one or more of our markets will not adversely affect us and our results of operations.

We intend to pursue acquisitions, joint ventures and alliances that involve a number of inherent risks, any of which may cause us not to realize anticipated benefits.

One aspect of our business strategy is to selectively pursue acquisitions, joint ventures and alliances that we believe will improve our market position, and provide opportunities to realize operating synergies. These transactions involve inherent risks and uncertainties, any one of which could have a material adverse effect on our business, results of operations and financial condition including:

•	difficulties in achieving identified financial and operating synergies, including the integration of operations, services and products;

•	diversion of management’s attention from other business concerns;

•	the assumption of unknown liabilities; and

•	unanticipated changes in the market conditions, business and economic factors affecting such an acquisition.

We cannot assure that we will be able to consummate any future acquisitions, joint ventures or other business combinations. If we are unable to identify suitable acquisition candidates or to consummate strategic acquisitions, we may be unable to fully implement our business strategy, and our business and results of operations may be adversely affected as a result. In addition, our ability to engage in strategic acquisitions will be dependent on our ability to raise substantial capital, and we may not be able to raise the funds necessary to implement our acquisition strategy on terms satisfactory to us, if at all.

As we introduce new products and services, a failure to predict and react to customer demand could adversely affect our business.

We have dedicated significant resources to the development, manufacturing and marketing of new products. Decisions to develop and market new transportation products are typically made without firm indications of customer acceptance. Moreover, by their nature, new products may require alteration of existing business methods or threaten to displace existing equipment in which our customers may have a substantial capital investment. There can be no assurance that any new products that we develop will gain widespread acceptance in the marketplace or that such products will be able to compete successfully with other new products or services that may be introduced by competitors. In addition, we may incur additional warranty or other costs as new products are tested and used by customers.

11

---

A portion of our sales are related to delivering products and services to help our U.S. railroad and transit customers meet the Positive Train Control (PTC) mandate from the U.S. federal government, which requires the use of on-board locomotive computers and software by the end of 2018.

For the year ended December 31, 2017, we had sales of about $322 million related to Train Control and Signaling, which includes PTC. In 2015, the industry's PTC deadline was extended by three years through December 31, 2018, which also included the ability of railroads to request an additional two years for compliance with the approval of the Department of Transportation if certain parameters are met. This could change the timing of our revenues and could cause us to reassess the staffing, resources and assets deployed in delivering Positive Train Control services.

Our revenues are subject to cyclical variations in the railway and passenger transit markets and changes in government spending.

The railway industry historically has been subject to significant fluctuations due to overall economic conditions, the use of alternate methods of transportation and the levels of government spending on railway projects. In economic downturns, railroads have deferred, and may defer, certain expenditures in order to conserve cash in the short term. Reductions in freight traffic may reduce demand for our replacement products.

The passenger transit railroad industry is also cyclical. New passenger transit car orders vary from year to year and are influenced greatly by major replacement programs and by the construction or expansion of transit systems by transit authorities. To the extent that future funding for proposed public projects is curtailed or withdrawn altogether as a result of changes in political, economic, fiscal or other conditions beyond our control, such projects may be delayed or cancelled, resulting in a potential loss of business for us, including transit aftermarket and new transit car orders. There can be no assurance that economic conditions will be favorable or that there will not be significant fluctuations adversely affecting the industry as a whole and, as a result, us.

Our backlog is not necessarily indicative of the level of our future revenues.

Our backlog represents future production and estimated potential revenue attributable to firm contracts with, or written orders from, our customers for delivery in various periods.  Instability in the global economy, negative conditions in the global credit markets, volatility in the industries that our products serve, changes in legislative policy, adverse changes in the financial condition of our customers, adverse changes in the availability of raw materials and supplies, or un-remedied contract breaches could possibly lead to contract termination or cancellations of orders in our backlog or request for deferred deliveries of our backlog orders, each of which could adversely affect our cash flows and results of operations.

A growing portion of our sales may be derived from our international operations, which exposes us to certain risks inherent in doing business on an international level.

In fiscal year 2017, approximately 66% of our consolidated net sales were to customers outside of the U.S. and we intend to continue to expand our international operations in the future. Our global headquarters for the Transit group is located in France, and we currently conduct other international operations through a variety of wholly and majority-owned subsidiaries and joint ventures in Australia, Austria, Brazil, Canada, China, Czech Republic, France, Germany, India, Italy, Macedonia, Mexico, the Netherlands, Poland, Russia, Spain, South Africa, Turkey, and the United Kingdom. As a result, we are subject to various risks, any one of which could have a material adverse effect on those operations and on our business as a whole, including:

•	lack of complete operating control;

•	lack of local business experience;

•	currency exchange fluctuations and devaluations;

•	foreign trade restrictions and exchange controls;

•	difficulty enforcing agreements and intellectual property rights;

•	the potential for nationalization of enterprises; and

•	economic, political and social instability and possible terrorist attacks against American interests.

In addition, certain jurisdictions have laws that limit the ability of non-U.S. subsidiaries and their affiliates to pay dividends and repatriate cash flows.

12

---

We may have liability arising from asbestos litigation.

Claims have been filed against the Company and certain of its affiliates in various jurisdictions across the United States by persons alleging bodily injury as a result of exposure to asbestos-containing products. Most of these claims have been made against our wholly owned subsidiary, Railroad Friction Products Corporation (RFPC), and are based on a product sold by RFPC prior to the time that the Company acquired any interest in RFPC.

Most of these claims, including all of the RFPC claims, are submitted to insurance carriers for defense and indemnity or to non-affiliated companies that retain the liabilities for the asbestos-containing products at issue. We cannot, however, assure that all these claims will be fully covered by insurance or that the indemnitors or insurers will remain financially viable. Our ultimate legal and financial liability with respect to these claims, as is the case with most other pending litigation, cannot be estimated.

We are subject to a variety of environmental laws and regulations.

We are subject to a variety of environmental laws and regulations governing discharges to air and water, the handling, storage and disposal of hazardous or solid waste materials and the remediation of contamination associated with releases of hazardous substances. We believe our operations currently comply in all material respects with all of the various environmental laws and regulations applicable to our business; however, there can be no assurance that environmental requirements will not change in the future or that we will not incur significant costs to comply with such requirements.

Future climate change regulation could result in increased operating costs, affect the demand for our products or affect the ability of our critical suppliers to meet our needs.

The Company has followed the current debate over climate change and the related policy discussion and prospective legislation. The potential challenges for the Company that climate change policy and legislation may pose have been reviewed by the Company. Any such challenges are heavily dependent on the nature and degree of climate change legislation and the extent to which it applies to our industry. At this time, the Company cannot predict the ultimate impact of climate change and climate change legislation on the Company’s operations. Further, when or if these impacts may occur cannot be assessed until scientific analysis and legislative policy are more developed and specific legislative proposals begin to take shape. Any laws or regulations that may be adopted to restrict or reduce emissions of greenhouse gas could require us to incur increased operating costs, and could have an adverse effect on demand for our products. In addition, the price and availability of certain of the raw materials that we use could vary in the future as a result of environmental laws and regulations affecting our suppliers. An increase in the price of our raw materials or a decline in their availability could adversely affect our operating margins or result in reduced demand for our products.

The occurrence of litigation in which we could be named as a defendant is unpredictable.

From time to time, the Company is subject to litigation or other commercial disputes and other legal and regulatory proceedings with respect to our business, customers, suppliers, creditors, shareholders, product liability, intellectual property infringement, warranty claims or environmental-related matters. Due to the inherent uncertainties of any litigation, commercial disputes or other legal or regulatory proceedings, the Company cannot accurately predict their ultimate outcome, including the outcome of any related appeals. We may incur significant expense to defend or otherwise address current or future claims. Any litigation, even a claim without merit, could result in substantial costs and diversion of resources and could have a material adverse effect on our business and results of operations. Although we maintain insurance policies for certain risks, we cannot make assurances that this insurance will be adequate to protect us from all material judgments and expenses related to potential future claims or that these levels of insurance will be available in the future at economical prices or at all.

The Company is subject to national and international laws and regulations, such as the anti-corruption laws of the U.S. Foreign Corrupt Practices Act, the French Law n° 2016-1691 (Sapin II) and the U.K. Bribery Act, relating to its business and its employees. Despite the Company's policies, procedures and compliance programs, its internal controls and compliance systems may not be able to protect the Company from prohibited acts willfully committed by its employees, agents or business partners that would violate such applicable laws and regulations. Any such improper acts could damage the Company's reputation, subject it to civil or criminal judgments, fines or penalties, and could otherwise disrupt the Company's business, and as a result, could materially adversely impact the Company's business, financial condition or results of operations.

If we are not able to protect our intellectual property and other proprietary rights, we may be adversely affected.

Our success can be impacted by our ability to protect our intellectual property and other proprietary rights. We rely primarily on patents, trademarks, copyrights, trade secrets and unfair competition laws, as well as license agreements and other contractual provisions, to protect our intellectual property and other proprietary rights. However, a significant portion of our technology is not patented and we may be unable or may not seek to obtain patent protection for this technology. Moreover,

13

---

existing U.S. legal standards relating to the validity, enforceability and scope of protection of intellectual property rights offer only limited protection, may not provide us with any competitive advantages and may be challenged by third parties. The laws of countries other than the United States may be even less protective of intellectual property rights. Accordingly, despite our efforts, we may be unable to prevent third parties from infringing upon or misappropriating our intellectual property or otherwise gaining access to our technology. If we fail to protect our intellectual property and other proprietary rights, then our business, results of operations or financial condition could be negatively impacted.

We face risks relating to cybersecurity attacks that could cause loss of confidential information and other business disruptions.

We rely extensively on computer systems to process transactions and manage our business, and our business is at risk from and may be impacted by cybersecurity attacks. These could include attempts to gain unauthorized access to our data and computer systems. Attacks can be both individual and/or highly organized attempts organized by very sophisticated hacking organizations. We employ a number of measures to prevent, detect and mitigate these threats, which include employee education, password encryption, frequent password change events, firewall detection systems, anti-virus software in-place and frequent backups; however, there is no guarantee such efforts will be successful in preventing a cyber-attack. A cybersecurity attack could compromise the confidential information of our employees, customers and supplier, and potentially violate certain domestic and international privacy laws. Furthermore, a cybersecurity attack on our customers and suppliers could compromise our confidential information in the possession of our customers and suppliers. A successful attack could disrupt and otherwise adversely affect our business operations, including through lawsuits by third-parties.

Our manufacturer’s warranties or product liability may expose us to potentially significant claims.

We warrant the workmanship and materials of many of our products. Accordingly, we are subject to a risk of product liability or warranty claims in the event that the failure of any of our products results in personal injury or death, or does not conform to our customers’ specifications. In addition, in recent years, we have introduced a number of new products for which we do not have a history of warranty experience. Although we currently maintain liability insurance coverage, we cannot assure that product liability claims, if made, would not exceed our insurance coverage limits or that insurance will continue to be available on commercially acceptable terms, if at all. The possibility exists for these types of warranty claims to result in costly product recalls, significant repair costs and damage to our reputation.

Labor disputes may have a material adverse effect on our operations and profitability.

We collectively bargain with labor unions at some of our operations throughout the world. Failure to reach an agreement could result in strikes or other labor protests which could disrupt our operations. Furthermore, non-union employees in certain countries have the right to strike. If we were to experience a strike or work stoppage, it would be difficult for us to find a sufficient number of employees with the necessary skills to replace these employees. We cannot assure that we will reach any such agreement or that we will not encounter strikes or other types of conflicts with the labor unions of our personnel. Such labor disputes could have an adverse effect on our business, financial condition or results of operations, could cause us to lose revenues and customers and might have permanent effects on our business.

We may incur increased costs due to fluctuations in interest rates and foreign currency exchange rates

In the ordinary course of business, we are exposed to increases in interest rates that may adversely affect funding costs associated with variable-rate debt and changes in foreign currency exchange rates. We may seek to minimize these risks through the use of interest rate swap contracts and currency hedging agreements. There can be no assurance that any of these measures will be effective. Material changes in interest or exchange rates could result in material losses to us.

Our indebtedness could adversely affect our financial health.

Being indebted could have important consequences to us. At December 31, 2017, we had total debt of $1,870.5 million. If it becomes necessary to access our available borrowing capacity under our 2016 Refinancing Credit Agreement, the $853.1 million currently borrowed under this facility and the $747.7 million 3.450% senior notes, and the $248.6 million 4.375% senior notes. For example, it could:

•	increase our vulnerability to general adverse economic and industry conditions;

•	require us to dedicate a substantial portion of our cash flow from operations to payments on our indebtedness, thereby reducing the availability of our cash flow to fund working capital, capital expenditures, acquisitions and other general corporate purposes;

•	limit our flexibility in planning for, or reacting to, changes in our business and the industries in which we operate;

•	place us at a disadvantage compared to competitors that have less debt; and

•	limit our ability to borrow additional funds.

14

---

The indenture for our $750 million 3.450% senior notes due in 2026, our $250 million 4.375% senior notes due in 2023, and our 2016 Refinancing Credit Agreement contain various covenants that limit our management’s discretion in the operation of our businesses.

The 2016 Refinancing Credit Agreement limits the Company’s ability to declare or pay cash dividends and prohibits the Company from declaring or making other distributions, subject to certain exceptions. The 2016 Refinancing Credit Agreement contains various other covenants and restrictions including the following limitations: incurrence of additional indebtedness; mergers, consolidations and sales of assets and acquisitions; additional liens; sale and leasebacks; permissible investments, loans and advances; certain debt payments; capital expenditures; and imposes a minimum interest expense coverage ratio and a maximum debt to EBITDA ratio. See "Management's Discussion and Analysis of Financial Condition and Results of Operations" and see Note 8 of "Notes to Consolidated Financial Statements" included in Part IV, Item 15 of this report.

The indentures under which the senior notes were issued contain covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens.

The integration of our recently completed acquisitions may not result in anticipated improvements in market position or the realization of anticipated operating synergies or may take longer to realize than expected.

In 2016 and 2017, we completed multiple acquisitions with a combined investment of $1,865 million, which included our acquisition of Faiveley Transport for $1,507 million. Although we believe that the acquisitions will improve our market position and realize positive operating results, including operating synergies, operating expense reductions and overhead cost savings, we cannot be assured that these improvements will be obtained or the timing of such improvements. The management and acquisition of businesses involves substantial risks, any of which may result in a material adverse effect on our business and results of operations, including:

•	the uncertainty that an acquired business will achieve anticipated operating results;

•	significant expenses to integrate;

•	diversion of Management’s attention;

•	departure of key personnel from the acquired business;

•	effectively managing entrepreneurial spirit and decision-making;

•	integration of different information systems;

•	unanticipated costs and exposure to unforeseen liabilities; and

•	impairment of assets.

Item 1B.	UNRESOLVED STAFF COMMENTS

None.

15

---

Item 2.	PROPERTIES

Facilities

The following table provides certain summary information about the principal facilities owned or leased by the Company as of December 31, 2017. The Company believes that its facilities and equipment are generally in good condition and that, together with scheduled capital improvements, they are adequate for its present and immediately projected needs. Leases on the facilities are long-term and generally include options to renew. The Company’s corporate headquarters are located at the Wilmerding, PA site.

 

Location

Primary Use

Segment

Own/Lease

Approximate Square Feet

Domestic

Rothbury, MI

Manufacturing/Warehouse/Office

Freight

Own

500,000

Wilmerding, PA

Manufacturing/Service

Freight

Own

365,000

(1

)

Lexington, TN

Manufacturing

Freight

Own

170,000

Jackson, TN

Manufacturing

Freight

Own

150,000

Berwick, PA

Manufacturing/Warehouse

Freight

Own

150,000

Chicago, IL

Manufacturing/Service

Freight

Own

123,000

Greensburg, PA

Manufacturing

Freight

Own

113,000

Chillicothe, OH

Manufacturing/Office

Freight

Own

104,000

Warren, OH

Manufacturing

Freight

Own

103,000

Delray Beach, FL

Warehouse

Freight

Lease

126,000

Boise, ID

Manufacturing

Freight/Transit

Own

326,000

Maxton, NC

Manufacturing

Freight/Transit

Own

105,000

Salem, VA

Manufacturing

Transit

Own

320,000

Greenville, SC

Manufacturing

Transit

Own

154,000

Brenham, TX

Manufacturing/Office

Transit

Own

145,000

Spartanburg, SC

Manufacturing/Service

Transit

Lease

184,000

Carson City, NV

Manufacturing

Transit

Lease

176,000

Buffalo Grove, IL

Manufacturing

Transit

Lease

116,000

International

Sao Paulo, Brazil

Manufacturing/Office

Freight

Own

177,000

Wallaceburg (Ontario), Canada

Manufacturing

Freight

Own

126,000

Northampton, UK

Manufacturing

Freight

Lease

300,000

Shenyang City, Liaoning Province, China

Manufacturing

Freight

Lease

291,000

Lincolnshire, UK

Manufacturing/Office

Freight

Lease

149,000

London (Ontario), Canada

Manufacturing

Freight

Lease

104,000

Doncaster, UK

Manufacturing/Service

Freight/Transit

Own

330,000

Kilmarnock, UK

Manufacturing

Freight/Transit

Own

108,000

Loughborough, UK

Manufacturing

Freight/Transit

Lease

245,000

Kempton Park, South Africa

Manufacturing

Freight/Transit

Lease

156,000

Piossasco, Italy

Manufacturing

Transit

Own

301,000

Monte Alto, Brazil

Manufacturing/Office

Transit

Own

244,000

Tamil Nadu, India

Manufacturing

Transit

Own

220,000

Schkeuditz, Germany

Manufacturing

Transit

Own

219,000

16

---

Location

Primary Use

Segment

Own/Lease

Approximate Square Feet

Schuttorf, Germany

Manufacturing/Office

Transit

Own

189,000

Amiens, France

Manufacturing

Transit

Own

142,000

Chard, UK

Manufacturing/Office

Transit

Own

142,000

St Pierre Des Corps, France

Manufacturing

Transit

Own

133,000

Avellino, Italy

Manufacturing/Office

Transit

Own

132,000

Burton on Trent, UK

Manufacturing/Office

Transit

Lease

253,000

Blovice, Czech Republic

Manufacturing

Transit

Lease

235,000

Witten, Germany

Manufacturing

Transit

Lease

209,000

Verviers, Belgium

Manufacturing/Office

Transit

Lease

137,000

Camisano, Italy

Manufacturing/Office

Transit

Lease

136,000

San Luis Potosi, Mexico

Manufacturing/Office

Transit

Lease

113,000

Birkenhead, UK

Overhaul/Manufacturing

Transit

Lease

109,000

Shanghai, China

Manufacturing

Transit

Lease

104,000

 

(1)	Approximately 250,000 square feet are currently used in connection with the Company’s corporate and manufacturing operations. The remainder is leased to third parties.

Item  3.	LEGAL PROCEEDINGS

Additional information with respect to legal proceedings is included in Note 19 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report and incorporate by reference herein.

Item  4.	MINE SAFETY DISCLOSURES

Not applicable.

17

---

EXECUTIVE OFFICERS OF THE REGISTRANT

The following table provides information on our executive officers as of December 31, 2017. They are elected periodically by our Board of Directors and serve at its discretion.

Officers		Age		Position
Albert J. Neupaver		67		Chairman of the Board
Raymond T. Betler		62		President and Chief Executive Officer
Stephane Rambaud-Measson		55		Executive Vice President, President and Chief Operating Officer
Patrick D. Dugan		51		Executive Vice President Finance, and Chief Financial Officer
R. Mark Cox		49		Executive Vice President, Corporate Development
David L. DeNinno		62		Executive Vice President, General Counsel and Secretary
Scott E. Wahlstrom		54		Executive Vice President, Human Resources
John A. Mastalerz		51		Senior Vice President of Finance, Corporate Controller and Principal Accounting Officer
Paul I. Overby		60		Vice President, Corporate Strategy
Timothy R. Wesley		56		Vice President, Investor Relations and Corporate Communications

Albert J. Neupaver was named Chairman of the Board of Directors in May 2017. Prior to that, Mr. Neupaver served as Executive Chairman of the Company since May 2014. Previously, he served as Chairman and CEO from May 2013 to May 2014 and as the Company’s President and CEO from February 2006 to May 2013.  Prior to joining Wabtec, Mr. Neupaver served in various positions at AMETEK, Inc., a leading global manufacturer of electronic instruments and electric motors. Most recently he served as President of its Electromechanical Group for nine years.

Raymond T. Betler was named President and Chief Executive Officer in May 2014. Previously, Mr. Betler was President and Chief Operating Officer since May 2013 and the Company’s Chief Operating Officer since December 2010.  Prior to that, he served as Vice President, Group Executive of the Company since August 2008. Prior to joining Wabtec, Mr. Betler served in various positions of increasing responsibility at Bombardier Transportation since 1979. Most recently, Mr. Betler served as President, Total Transit Systems from 2004 until 2008 and before that as President, London Underground Projects from 2002 to 2004.

Stephane Rambaud-Measson was named Executive Vice President and Chief Operating Officer in May 2017. Prior to that, Mr. Rambaud-Measson served as Executive Vice President, President and CEO, Transit Segment from December 2016. Previously, Mr. Rambaud-Measson was Chairman of the Management Board and Chief Executive Officer of Faiveley Transport from April 2014 until November 30, 2016.  Prior to that position, he served as Executive Vice President of Faiveley Transport from March 2014 to April 2014. Prior to joining Faiveley Transport, Mr. Rambaud-Measson was Chief Executive Officer of Veolia Verkehr. Prior to that, Mr. Rambaud-Measson served in various management roles at Bombardier Transport including President of the Passengers Division beginning in 2008. Before that, in 2005, he was appointed President of Mainline & Metro after serving as Group Vice President Project Management and Administration, which he began in 2004.

Patrick D. Dugan was named Executive Vice President and Chief Financial Officer effective December 2016. Previously Mr. Dugan served as Senior Vice President and Chief Financial Officer since January 2014.  Previously, Mr. Dugan was Senior Vice President, Finance and Corporate Controller from January 2012 until November 2013.   He originally joined Wabtec in 2003 as Vice President, Corporate Controller. Prior to joining Wabtec, Mr. Dugan served as Vice President and Chief Financial Officer of CWI International, Inc. from December 1996 to November 2003. Prior to 1996, Mr. Dugan was a Manager with PricewaterhouseCoopers.

R. Mark Cox was named Executive Vice President, Corporate Development effective December 2016. Previously, Mr. Cox served as Sr. Vice President Corporate Development from January 2012, and has been with Wabtec since September 2006 as Vice President, Corporate Development. Prior to joining Wabtec, Mr. Cox served as Director of Business Development for the Electrical Group of Eaton Corporation since 2002. Prior to joining Eaton, Mr. Cox was an investment banker with UBS Warburg, Prudential and Stephens.

David L. DeNinno was named Executive Vice President, General Counsel and Secretary of the Company effective December 2016. Previously, Mr. DeNinno served as Sr. Vice President, General Counsel and Secretary since February 2012. Previously, Mr. DeNinno served as a partner at K&L Gates LLP since May 2011 and prior to that with Reed Smith LLP.

    

Scott E. Wahlstrom was named Executive Vice President, Human Resources effective December 2016. Previously, Mr. Wahlstrom served as Senior Vice President, Human Resources since January 2012. Prior to that, Mr. Wahlstrom has been

18

---

Vice President, Human Resources, since November 1999. Previously, Mr. Wahlstrom was Vice President, Human Resources & Administration of MotivePower Industries, Inc. from August 1996 until November 1999.

John A. Mastalerz was named Senior Vice President of Finance, Corporate Controller and Principal Accounting Officer in July 2017. Previously, Mr. Mastalerz served as Vice President and Corporate Controller from January 2014 to July 2017. Prior to joining Wabtec, Mr. Mastalerz served in various executive management roles with the H.J. Heinz Company from January 2001 to December 2013, most recently as Corporate Controller and Principal Accounting Officer.  Prior to 2001, Mr. Mastalerz was a Senior Manager with PricewaterhouseCoopers.

Paul I. Overby was named Vice President, Corporate Strategy in January of 2016. Prior to joining Wabtec, Mr. Overby was founder and President of Paul Overby Associates from 2009 and prior to that, Mr. Overby served in various executive management roles at Bombardier.

Timothy R. Wesley was named Vice President, Investor Relations and Corporate Communications in November 1999. Previously, Mr. Wesley was Vice President, Investor and Public Relations of MotivePower Industries, Inc. from August 1996 until November 1999.

19

---

PART II

Item  5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

The Common Stock of the Company is listed on the New York Stock Exchange under the symbol “WAB”. As of February 16, 2018, there were 96,090,518 shares of Common Stock outstanding held by 473 holders of record. The high and low sales price of the shares and dividends declared per share were as follows:

2017		High				Low				Dividends
First Quarter		$	88.87			$	74.06			$	0.100
Second Quarter		$	92.00			$	77.09			$	0.100
Third Quarter		$	93.81			$	69.20			$	0.120
Fourth Quarter		$	82.13			$	71.96			$	0.120
2016		High				Low				Dividends
First Quarter		$	80.61			$	60.28			$	0.080
Second Quarter		$	88.46			$	66.14			$	0.080
Third Quarter		$	82.00			$	65.54			$	0.100
Fourth Quarter		$	89.18			$	74.32			$	0.100

The Company’s 2016 Refinancing Credit Agreement restricts the ability to make dividend payments, with certain exceptions. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and see Note 8 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

At the close of business on February 16, 2018, the Company’s Common Stock traded at $77.27 per share.

The following performance graph and related information shall not be deemed “soliciting material” or to be “filed” with the Securities and Exchange Commission, nor shall such information be incorporated by reference to any future filings under the Securities Act of 1933 and the Securities Exchange Act of 1934, each as amended, except to the extent that Wabtec specifically incorporates it by reference into such filing. The graph below compares the total stockholder return through December 31, 2017, of Wabtec’s common stock to (i) the S&P 500 and (ii) our peer group of manufacturing companies which consists of the following publicly traded companies: AGCO, AMETEK, Colfax, Dana, Dover, Flowserve, The Greenbrier Companies, Navistar, Oshkosh, Regal Beloit, Rockwell Automation, Rockwell Collins, Terex, Trinity Industries, Snap-On, WABCO and Xylem.  

20

---

Month		Total Number of Shares Purchased			Average Price Paid per Share				Total Number of Shares Purchased as Part of Publicly Announced Programs (1)			Maximum Dollar Value of Shares That May Yet Be Purchased Under the Programs (1)
October 2017		—			—				—			$	137,824,347
November 2017		—			$	—			—			$	137,824,347
December 2017		—			$	—			—			$	137,824,347
Total quarter ended December 31, 2017		—			$	—			—			$	137,824,347

(1)

On February 9, 2016, the Board of Directors amended its stock repurchase authorization to $350.0 million of the Company’s outstanding shares. During the twelve months ended December 31, 2017 and 2016, the Company repurchased $0.0 million and $212.2 million, respectively, leaving $137.8 million remaining under the authorization. No time limit was set for the completion of the programs which conforms to the requirements under the 2016 Refinancing Credit Agreement, as well as the senior notes currently outstanding.

The Company intends to purchase shares on the open market or in negotiated or block trades. No time limit was set for the completion of the programs which conform to the requirements under the 2016 Refinancing Credit Agreement, as well as the senior notes currently outstanding.

    

21

---

Item 6.	SELECTED FINANCIAL DATA

The following table shows selected consolidated financial information of the Company and has been derived from audited financial statements. This financial information should be read in conjunction with, and is qualified by reference to, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the Consolidated Financial Statements of the Company and the Notes thereto included elsewhere in this Form 10-K.

		Year Ended December 31,
In thousands, except per share amounts		2017				2016				2015				2014				2013
Income Statement Data
Net sales		$	3,881,756			$	2,931,188			$	3,307,998			$	3,044,454			$	2,566,392
Gross profit		1,065,313				924,239				1,047,816				935,982				764,027
Operating expenses		(643,580		)		(465,878		)		(440,249		)		(408,873		)		(326,717		)
Income from operations		$	421,733			$	458,361			$	607,567			$	527,109			$	437,310
Interest expense, net		$	(68,704	)		$	(42,561	)		$	(16,888	)		$	(17,574	)		$	(15,341	)
Other (expense) income, net		(966		)		(2,963		)		(5,311		)		(1,680		)		(882		)
Net income attributable to Wabtec shareholders		$	262,261			$	304,887			$	398,628			$	351,680			$	292,235
Diluted Earnings per Common Share
Net income attributable to Wabtec shareholders (1)		$	2.72			$	3.34			$	4.10			$	3.62			$	3.01
Cash dividends declared per share (1)		$	0.44			$	0.36			$	0.28			$	0.20			$	0.13
Fully diluted shares outstanding (1)		96,125				91,141				97,006				96,885				96,832
Balance Sheet Data
Total assets		$	6,579,980			$	6,581,018			$	3,229,513			$	3,303,841			$	2,821,997
Cash and cash equivalents		233,401				398,484				226,191				425,849				285,760
Total debt		1,870,528				1,892,776				692,238				521,195				450,709
Total equity		2,828,532				2,976,825				1,701,339				1,808,298				1,587,167

(1)	Information above for net income attributable to Wabtec shareholders, cash dividends declared per share and fully diluted shares outstanding for all periods presented reflects the two-for-one split of the Company’s common stock, which occurred on May 14, 2013.

22

---

Item 7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

Wabtec is one of the world’s largest providers of value-added, technology-based products and services for the global rail industry. Our products are found on virtually all U.S. locomotives, freight cars and passenger transit vehicles, as well as in more than 100 countries throughout the world. Our products enhance safety, improve productivity and reduce maintenance costs for customers, and many of our core products and services are essential in the safe and efficient operation of freight rail and passenger transit vehicles. Wabtec is a global company with operations in 31 countries. In 2017, about 66% of the Company’s revenues came from customers outside the U.S.

Management Review and Future Outlook

Wabtec’s long-term financial goals are to generate cash flow from operations in excess of net income, maintain a strong credit profile while minimizing our overall cost of capital, increase margins through strict attention to cost controls and implementation of the Wabtec Excellence Program, and increase revenues through a focused growth strategy, including product innovation and new technologies, global and market expansion, aftermarket products and services, and acquisitions. In addition, Management evaluates the Company’s current operational performance through measures such as quality and on-time delivery.

The Company primarily serves the worldwide freight and transit rail industries. As such, our operating results are largely dependent on the level of activity, financial condition and capital spending plans of railroads and passenger transit agencies around the world, and transportation equipment manufacturers who serve those markets. Many factors influence these industries, including general economic conditions; traffic volumes, as measured by freight carloadings and passenger ridership; government spending on public transportation; and investment in new technologies. In general, trends such as increasing urbanization, a focus on sustainability and environmental awareness, an aging equipment fleet, and growth in global trade are expected to drive continued investment in freight and transit rail.

The Company monitors a variety of factors and statistics to gauge market activity. Freight rail markets around the world are driven primarily by overall economic conditions and activity, while Transit markets are driven primarily by government funding and passenger ridership. Changes in these market drivers can cause fluctuations in demand for Wabtec's products and services.

According to the 2016 edition of a market study by UNIFE, the Association of the European Rail Industry, the accessible global market for railway products and services was more than $100 billion, and was expected to grow at about 3.2% annually through 2021. The three largest geographic markets, which represented about 80% of the total accessible market, were Europe, North America and Asia Pacific. UNIFE projected above-average growth in Asia Pacific and Europe due to overall economic growth and trends such as urbanization and increasing mobility, deregulation, investments in new technologies, energy and environmental issues, and increasing government support. The largest product segments of the market were rolling stock, services and infrastructure, which represented almost 90% of the accessible market. UNIFE projected spending on rolling stock to grow at an above-average rate due to increased investment in passenger transit vehicles. UNIFE estimated that the global installed base of locomotives was about 114,000 units, with about 32% in Asia Pacific, about 25% in North America and about 18% in Russia-CIS (Commonwealth of Independent States).  Wabtec estimates that about 2,600 new locomotives were delivered worldwide in 2017, and it expects deliveries of about 2,700 in 2018. UNIFE estimated the global installed base of freight cars was about 5.5 million units, with about 37% in North America, about 26% in Russia-CIS and about 20% in Asia Pacific. Wabtec estimates that about 155,000 new freight cars were delivered worldwide in 2017, and it expects deliveries of about 148,000 in 2018.  UNIFE estimated the global installed base of passenger transit vehicles to be about 569,000 units, with about 43% in Asia Pacific, about 32% in Europe and about 14% in Russia-CIS. Wabtec estimates that about 34,000 new passenger transit vehicles were delivered worldwide in 2017, and it expects deliveries of about 44,000 in 2018.

In Europe, the majority of the rail system serves the passenger transit market, which is expected to continue growing as energy and environmental factors encourage continued investment in public mass transit. According to UNIFE, France, Germany and the United Kingdom were the largest Western European transit markets, representing almost two-thirds of industry spending in the European Union. UNIFE projected the Western European rail market to grow at about 3.6% annually, led by investments in new rolling stock in France and Germany.  Significant investments were also expected in Turkey, the largest market in Eastern Europe. About 75% of freight traffic in Europe is hauled by truck, while rail accounts for about 20%. The largest freight markets in Europe are Germany, Poland and the United Kingdom. In recent years, the European Commission has adopted a series of measures designed to increase the efficiency of the European rail network by standardizing operating rules and certification requirements. UNIFE believes that adoption of these measures should have a positive effect on ridership and investment in public transportation over time.

23

---

In North America, railroads carry about 40% of intercity freight, as measured by ton-miles, which is more than any other mode of transportation. Through direct ownership and operating partnerships, U.S. railroads are part of an integrated network that includes railroads in Canada and Mexico, forming what is regarded as the world’s most-efficient and lowest-cost freight rail service. There are more than 500 railroads operating in North America, with the largest railroads, referred to as “Class I,” accounting for more than 90% of the industry’s revenues. The railroads carry a wide variety of commodities and goods, including coal, metals, minerals, chemicals, grain, and petroleum.  These commodities represent about 50% of total rail carloadings, with intermodal carloads accounting for the rest. Railroads operate in a competitive environment, especially with the trucking industry, and are always seeking ways to improve safety, cost and reliability. New technologies offered by Wabtec and others in the industry can provide some of these benefits. Demand for our freight related products and services in North America is driven by a number of factors, including rail traffic, and production of new locomotives and new freight cars.  In the U.S., the passenger transit industry is dependent largely on funding from federal, state and local governments, and from fare box revenues. Demand for North American passenger transit products is driven by a number of factors, including government funding, deliveries of new subway cars and buses, and ridership. The U.S. federal government provides money to local transit authorities, primarily to fund the purchase of new equipment and infrastructure for their transit systems.

Growth in the Asia Pacific market has been driven mainly by the continued urbanization of China and India, and by investments in freight rail rolling stock and infrastructure in Australia to serve its mining and natural resources markets. India is making significant investments in rolling stock and infrastructure to modernize its rail system; for example, the country has awarded a 1,000-unit locomotive order to a U.S. manufacturer. UNIFE expected the increased spending in India to offset decreased spending on very-high-speed rolling stock in China.

Other key geographic markets include Russia-CIS and Africa-Middle East.  With about 1.4 million freight cars and about 20,000 locomotives, Russia-CIS is among the largest freight rail markets in the world, and it’s expected to invest in both freight and transit rolling stock. PRASA, the Passenger Rail Agency of South Africa, is expected to continue to invest in new transit cars and new locomotives. According to UNIFE, emerging markets were expected to grow at above-average rates as global trade led to increased freight volumes and urbanization led to increased demand for efficient mass-transportation systems. As this growth occurs, Wabtec expects to have additional opportunities to provide products and services in these markets.

In its study, UNIFE also said it expected increased investment in digital tools for data and asset management, and in rail control technologies, both of which would improve efficiency in the global rail industry. UNIFE said data-driven asset management tools have the potential to reduce equipment maintenance costs and improve asset utilization, while rail control technologies have been focused on increasing track capacity, improving operational efficiency and ensuring safer railway traffic. Wabtec offers products and services to help customers make ongoing investments in these initiatives.

In 2018 and beyond, general global economic and market conditions will have an impact on our sales and operations. To the extent that these factors cause instability of capital markets, shortages of raw materials or component parts, longer sales cycles, deferral or delay of customer orders or an inability to market our products effectively, our business and results of operations could be materially adversely affected. In addition, we face risks associated with our four-point growth strategy including the level of investment that customers are willing to make in new technologies developed by the industry and the Company, and risks inherent in global expansion. When necessary, we will modify our financial and operating strategies to reflect changes in market conditions and risks.

ACQUISITION OF FAIVELEY TRANSPORT S.A.

On November 30, 2016, the Company acquired majority ownership of Faiveley Transport S.A. (“Faiveley Transport”)

under the terms of a Share Purchase Agreement (“Share Purchase Agreement”). Faiveley Transport is a leading global provider

of value-added, integrated systems and services for the railway industry with annual sales of about $1.2 billion and more than

5,700 employees in 24 countries. Faiveley Transport supplies railway manufacturers, operators and maintenance providers with

a range of value-added, technology-based systems and services in Energy & Comfort (air conditioning, power collectors and

converters, and passenger information), Access & Mobility (passenger access systems and platform doors), and Brakes and

Safety (braking systems and couplers). The transaction was structured as a step acquisition as follows:

•

On November 30, 2016, the Company acquired majority ownership of Faiveley Transport, after completing the purchase of the Faiveley family’s ownership interest under the terms of the Share Purchase Agreement, which directed the Company to pay €100 per share of Faiveley Transport, payable between 25% and 45% in cash at the election of those shareholders and the remainder payable in Wabtec stock. The Faiveley family’s ownership interest acquired by the Company represented approximately 51% of outstanding share capital and approximately 49% of the outstanding voting shares of Faiveley Transport. Upon completion of the share purchase under the

24

---

Share Purchase Agreement, Wabtec commenced a tender offer for the remaining publicly traded Faiveley Transport shares. The public shareholders had the option to elect to receive €100 per share in cash or 1.1538 shares of Wabtec common stock per share of Faiveley Transport. The common stock portion of the consideration was subject to a cap on issuance of Wabtec common shares that was equivalent to the rates of cash and stock elected by the 51% owners.

•

On February 3, 2017, the initial cash tender offer was closed, which resulted in the Company acquiring approximately 27% of additional outstanding share capital and voting rights of Faiveley Transport for approximately $411.8 million in cash and $25.2 million in Wabtec stock. After the initial cash tender offer, the Company owned approximately 78% of outstanding share capital and 76% of voting rights.

•

On March 6, 2017, the final cash tender offer was closed, which resulted in the Company acquiring approximately 21% of additional outstanding share capital and 22% of additional outstanding voting rights of Faiveley Transport for approximately $303.2 million in cash and $0.3 million in Wabtec stock. After the final cash tender offer, the Company owned approximately 99% of the share capital and 98% of the voting rights of Faiveley Transport.

•	On March 21, 2017, a mandatory squeeze-out procedure was finalized, which resulted in the Company acquiring the Faiveley Transport shares not tendered in the offers for approximately $17.5 million in cash. This resulted in the Company owning 100% of the share capital and voting rights of Faiveley Transport.

As of November 30, 2016, the date the Company acquired 51% of the share capital and 49% of the voting interest in Faiveley Transport, Faiveley Transport was consolidated under the variable interest entity model as the Company concluded that it was the primary beneficiary of Faiveley Transport as it then possessed the power to direct the activities of Faiveley Transport that most significantly impact its economic performance and it then possessed the obligation and right to absorb losses and benefits from Faiveley Transport.

The purchase price paid for 100% ownership of Faiveley Transport was $1,507 million. The $744.7 million included as deposits in escrow on the consolidated balance sheet at December 31, 2016 was cash designated for use as consideration for the tender offers.

25

---

RESULTS OF OPERATIONS

The following table shows our Consolidated Statements of Operations for the years indicated.

		Year Ended December 31,
In thousands		2017				2016				2015
Net sales		$	3,881,756			$	2,931,188			$	3,307,998
Cost of sales		(2,816,443		)		(2,006,949		)		(2,260,182		)
Gross profit		1,065,313				924,239				1,047,816
Selling, general and administrative expenses		(511,898		)		(371,805		)		(347,373		)
Engineering expenses		(95,166		)		(71,375		)		(71,213		)
Amortization expense		(36,516		)		(22,698		)		(21,663		)
Total operating expenses		(643,580		)		(465,878		)		(440,249		)
Income from operations		421,733				458,361				607,567
Interest expense, net		(68,704		)		(42,561		)		(16,888		)
Other (expense) income, net		(966		)		(2,963		)		(5,311		)
Income from operations before income taxes		352,063				412,837				585,368
Income tax expense		(89,773		)		(99,433		)		(186,740		)
Net income		262,290				313,404				398,628
Net income attributable to noncontrolling interest		(29		)		(8,517		)		—
Net income attributable to Wabtec shareholders		$	262,261			$	304,887			$	398,628

2017 COMPARED TO 2016

The following table summarizes the results of operations for the period:

		For the year ended December 31,
										Percent
In thousands		2017				2016				Change
Freight Segment		$	1,396,588			$	1,543,098			(9.5	)%
Transit Segment		2,485,168				1,388,090				79.0	%
Net sales		3,881,756				2,931,188				32.4	%
Income from operations		421,733				458,361				(8.0	)%
Net income attributable to Wabtec shareholders		$	262,261			$	304,887			(14.0	)%

The following table shows the major components of the change in sales in 2017 from 2016:

		Freight				Transit
In thousands		Segment				Segment				Total
2016 Net Sales		$	1,543,098			$	1,388,090			$	2,931,188
Acquisitions		148,122				1,035,061				1,183,183
Change in Sales by Product Line:
Specialty Products & Electronics		(164,532		)		8,502				(156,030		)
Remanufacturing, Overhaul & Build		(79,129		)		10,548				(68,581		)
Brake Products		(51,595		)		2,473				(49,122		)
Other		(480		)		1,397				917
Transit Products		—				45,462				45,462
Foreign exchange		1,104				(6,365		)		(5,261		)
2017 Net Sales		$	1,396,588			$	2,485,168			$	3,881,756

Net sales increased by $950.6 million to $3,881.8 million in 2017 from $2,931.2 million in 2016. The increase is due to sales from acquisitions of $1,183.2 million with the majority related to the Faiveley Transport acquisition. This increase was partially offset by a $156.0 million decrease for Specialty Products and Electronics due to lower demand for freight original equipment rail products and train control and signaling products and services, a $68.6 million decrease for Remanufacturing, Overhaul and Build primarily due to the absence of a large locomotive rebuild contract that completed in 2016, and a $49.1 million decrease for Brake products due to lower demand for original equipment brakes from freight and transit customers. Unfavorable foreign exchange decreased sales $5.3 million.

26

---

Freight Segment sales decreased by $146.5 million, or 9.5%, primarily due to a $164.5 million decrease for Specialty Products and Electronics sales from lower demand for freight original equipment rail products and train control and signaling products attributable to lower freight car and locomotive builds, a decrease of $79.1 million for Remanufacturing, Overhaul and Build sales due to a large locomotive rebuild contract that was completed in 2016, and a $51.6 million decrease in Brake Products sales from lower demand for original equipment brakes and aftermarket services. Acquisitions increased sales by $148.1 million and favorable foreign exchange increased sales by $1.1 million.

Transit Segment sales increased by $1,097.1 million, or 79.0%, primarily due to an increase in sales from acquisitions of $1,035.1 million with the majority related to the Faiveley Transport acquisition. Additionally, Transit Products sales increased $45.5 million from increased demand in original train doors, air conditioning systems, and other transit electronics, Overhaul & Build sales increased $10.5 million due to an increase in transit overhaul demand, and Specialty Products & Electronics sales increased $8.5 million due to increased demand for transit train control and signaling products and services. Unfavorable foreign exchange decreased sales by $6.4 million.

Cost of Sales and Gross Profit The following table shows the major components of cost of sales for the periods indicated:

	Twelve Months Ended December 31, 2017
In thousands	Freight				Percentage of Sales			Transit				Percentage of Sales			Total				Percentage of Sales
Material	$	526,727			37.7	%		$	1,123,571			45.2	%		$	1,650,298			42.5	%
Labor	186,863				13.4	%		339,110				13.6	%		525,973				13.5	%
Overhead	233,786				16.7	%		341,389				13.7	%		575,175				14.8	%
Other/Warranty	7,148				0.5	%		57,849				2.3	%		64,997				1.7	%
Total cost of sales	$	954,524			68.3	%		$	1,861,919			74.8	%		$	2,816,443			72.5	%
	Twelve Months Ended December 31, 2016
In thousands	Freight				Percentage of Sales			Transit				Percentage of Sales			Total				Percentage of Sales
Material	$	590,876			38.3	%		$	587,516			42.3	%		$	1,178,392			40.2	%
Labor	176,518				11.4	%		170,481				12.3	%		346,999				11.8	%
Overhead	242,956				15.7	%		213,821				15.4	%		456,777				15.6	%
Other/Warranty	5,575				0.4	%		19,206				1.4	%		24,781				0.8	%
Total cost of sales	$	1,015,925			65.8	%		$	991,024			71.4	%		$	2,006,949			68.4	%

Cost of sales increased by $809.5 million to $2,816.4 million in 2017 compared to $2,006.9 million in the same period of 2016.  For the twelve months ended 2017, cost of sales as a percentage of sales was 72.5% compared to 68.4% in the same period of 2016. The increase as a percentage of sales is due to product mix largely attributable to higher transit segment sales due to acquisitions, along with an unfavorable product mix within the freight segment. Also contributing to the increase were higher project adjustments of $44.5 million recorded on certain existing contracts and $11.8 million of restructuring and integration costs related to recent acquisitions.

Freight Segment cost of sales increased 2.5% as a percentage of sales to 68.3% in 2017 compared to 65.8% for the same period of 2016. The increase is primarily related to lower demand for freight original equipment rail products and train control and signaling products and services which typically offer a higher margin, higher project adjustments of $6.9 million on certain existing contracts related to labor, material and warranty costs, and $4.5 million of restructuring and integration costs related to recent acquisitions.

Transit Segment cost of sales increased 3.4% as a percentage of sales to 74.8% in 2017 compared to 71.4% for the same period in 2016. The increase is primarily related to product mix largely attributable to the acquisition of Faiveley Transport, which has lower overall margins and higher project adjustments of $37.6 million on certain existing contracts primarily related to material and warranty costs and $7.3 million of restructuring and integration costs related to recent acquisitions.

Included in cost of sales is warranty expense. The provision for warranty expense is generally established for specific losses, along with historical estimates of customer claims as a percentage of sales, which can cause variability in warranty expense between quarters. Warranty expense was $50.4 million in 2017 compared to $28.9 million in 2016. The increase in warranty expense is primarily related to the increase in sales and the contract adjustments noted above.

27

---

Operating expenses The following table shows our operating expenses:

		For the year ended December 31,
						Percentage of							Percentage of
In thousands		2017				Sales			2016				Sales
Selling, general and administrative expenses		$	511,898			13.2	%		$	371,805			12.7	%
Engineering expenses		95,166				2.5	%		71,375				2.4	%
Amortization expense		36,516				0.9	%		22,698				0.8	%
Total operating expenses		$	643,580			16.6	%		$	465,878			15.9	%

Total operating expenses were 16.6% and 15.9% of sales for 2017 and 2016, respectively. Selling, general, and administrative expenses increased $140.1 million, or 37.7%, primarily due to $174.7 million in incremental expense from acquisitions partially offset by lower costs due to cost saving initiatives and lower organic sales volumes. Engineering expense increased $23.8 million or 33.3% primarily due to additional expenses from acquisitions and remained a relatively consistent as a percentage of sales. Amortization expense increased $13.8 million due to amortization of intangibles associated with new acquisitions.

The following table shows our segment operating expenses:

		For the year ended December 31,
										Percent
In thousands		2017				2016				Change
Freight Segment		$	177,460			$	182,718			(2.9	)%
Transit Segment		434,704				225,620				92.7	%
Corporate		31,416				57,540				(45.4	)%
Total operating expenses		$	643,580			$	465,878			38.1	%

Freight Segment operating expenses decreased $5.3 million, or 2.9%, in 2017 and increased 150 basis points to 12.7% of sales.  The decrease is primarily attributable to reduced sales volumes and realized benefits associated with the cost saving initiatives undertaken in 2017 partially offset by $19.7 million of incremental operating expenses from acquisitions and $3.2 million related to integration and restructuring costs.    

Transit Segment operating expenses increased $209.1 million, or 92.7%, in 2017 and increased 290 basis points to 17.5% of sales.  The increase is primarily related to $191 million of incremental operating expenses related to acquisitions and $20 million related to integration and restructuring costs related to recent acquisitions.  

Corporate non-allocated operating expenses decreased $26.1 million in 2017 primarily due to a decrease in Faiveley Transport transaction and integration costs as well as benefits from cost savings initiatives undertaken in 2017 and 2016.

Interest expense, net Overall interest expense, net, increased $26.1 million in 2017 due to a higher overall debt balance in 2017 compared to 2016, primarily related to the Faiveley Transport acquisition and higher interest rates.

Other expense, net Other expense, net, decreased $2.0 million to $1.0 million for 2017, compared to 2016 primarily due to an increase in equity income earned on unconsolidated subsidiaries.  

Income taxes The effective income tax rate was 25.5% and 24.1% in 2017 and 2016, respectively. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "U.S. tax reform bill"). On December 23, 2017, the French government enacted the Finance Act for 2018 and it was published in the Official Bulletin on December 31, 2017. As a result, tax expense increased by $55.0 million related to the U.S. tax reform bill, see Note 10 of "Notes to Consolidated Financial Statements" included in Part IV, Item 8 of this report for further explanation. This was offset by decreases of $50.7 million primarily due to the revaluation of the net U.S. and French deferred tax liabilities as a result of the tax law enactments and the result of a lower earnings mix in higher tax rate jurisdictions. The net favorable deferred tax benefits related to the adjustment of deferred tax liabilities which had originally been established in prior periods.

28

---

2016 COMPARED TO 2015

The following table summarizes the results of operations for the period:

		For the year ended December 31,
										Percent
In thousands		2016				2015				Change
Freight Segment		$	1,543,098			$	2,054,715			(24.9	)%
Transit Segment		1,388,090				1,253,283				10.8	%
Net sales		2,931,188				3,307,998				(11.4	)%
Income from operations		458,361				607,567				(24.6	)%
Net income attributable to Wabtec shareholders		$	313,404			$	398,628			(21.4	)%

The following table shows the major components of the change in sales in 2016 from 2015:

		Freight				Transit
In thousands		Segment				Segment				Total
2015 Net Sales		$	2,054,715			$	1,253,283			$	3,307,998
Acquisition		55,097				134,095				189,192
Change in Sales by Product Line:
Specialty Products & Electronics		(438,285		)		35,611				(402,674		)
Remanufacturing, Overhaul & Build		(33,700		)		22,743				(10,957		)
Brake Products		(50,665		)		(4,442		)		(55,107		)
Transit Products		—				656				656
Other		(26,908		)		57				(26,851		)
Foreign exchange		(17,156		)		(53,913		)		(71,069		)
2016 Net Sales		$	1,543,098			$	1,388,090			$	2,931,188

Net sales decreased by $376.8 million to $2,931.2 million in 2016 from $3,308.0 million in 2015. The decrease is primarily due to lower sales for Specialty Products and Electronics of $402.7 million and lower Brake Products sales of $55.1 million due to decreased demand for freight products attributable to lower freight car and locomotive builds, and train control and signaling products and services, and lower Other Products sales of $26.9 million from decreased demand for freight spare part kits. Acquisitions increased sales $189.2 million and unfavorable foreign exchange decreased sales $71.1 million.

Freight Segment sales decreased by $511.6 million, or 24.9%, primarily due to a $438.3 million decrease for Specialty Products and Electronics sales from lower demand for freight original equipment rail products and train control and signaling products attributable to lower freight car and locomotive builds, a decrease of $50.7 million for Brake Products sales from lower demand for original equipment brakes and aftermarket services, a decrease of $33.7 million for Remanufacturing, Overhaul and Build sales due to a large locomotive rebuild contract that completed in 2016, and a decrease of $26.9 million for Other Product sales from decreased demand for freight spare part kits. Acquisitions increased sales by $55.1 million and unfavorable foreign exchange decreased sales by $17.2 million.

Transit Segment sales increased by $134.8 million, or 10.8%, primarily due to a $35.6 million increase for Specialty Products and Electronics from higher demand for original equipment conduction systems and current collectors, and an increase of $22.7 million for Remanufacturing, Overhaul and Build sales from higher demand for aftermarket locomotive builds. Acquisitions increased sales by $134.1 million and unfavorable foreign exchange decreased sales by $53.9 million.

29

---

Cost of Sales and Gross Profit The following table shows the major components of cost of sales for the periods indicated:

	Twelve Months Ended December 31, 2016
In thousands	Freight				Percentage of Sales			Transit				Percentage of Sales			Total				Percentage of Sales
Material	$	590,876			38.3	%		$	587,516			42.3	%		$	1,178,392			40.2	%
Labor	176,518				11.4	%		170,481				12.3	%		346,999				11.8	%
Overhead	242,956				15.7	%		213,821				15.4	%		456,777				15.6	%
Other/Warranty	5,575				0.4	%		19,206				1.4	%		24,781				0.8	%
Total cost of sales	$	1,015,925			65.8	%		$	991,024			71.4	%		$	2,006,949			68.4	%
	Twelve Months Ended December 31, 2015
In thousands	Freight				Percentage of Sales			Transit				Percentage of Sales			Total				Percentage of Sales
Material	$	854,728			41.6	%		$	531,152			42.4	%		$	1,385,880			41.9	%
Labor	219,495				10.7	%		156,357				12.5	%		375,852				11.4	%
Overhead	282,132				13.7	%		182,501				14.6	%		464,633				14.0	%
Other/Warranty	5,926				0.3	%		27,891				2.2	%		33,817				1.0	%
Total cost of sales	$	1,362,281			66.3	%		$	897,901			71.7	%		$	2,260,182			68.3	%

Cost of sales decreased by $253.2 million to $2,006.9 million in 2016 compared to $2,260.2 million in the same period of 2015.  For the twelve months ended 2016, cost of sales as a percentage of sales was 68.4% compared to 68.3% in the same period of 2015.

Freight Segment cost of sales decreased 0.5% as a percentage of sales to 65.8% in 2016 compared to 66.3% for the same period of 2015. The decrease as a percentage of sales is primarily related to sales with lower material content, lower overall material costs due to ongoing sourcing efforts, and decreases in various commodity prices partially offset by an increase in overhead costs as a percentage of sales which is primarily due to certain fixed overhead costs.

Transit Segment cost of sales decreased 0.3% as a percentage of sales to 71.4% in 2016 compared to 71.7% for the same period in 2015. The decrease is primarily due to better margin performance from prior year acquisitions and ongoing sourcing savings. These benefits were partially offset by $13.8 million of costs related to adjustments on certain long-term contracts.

Included in cost of sales is warranty expense. The provision for warranty expense is generally established for specific losses, along with historical estimates of customer claims as a percentage of sales, which can cause variability in warranty expense between quarters. Warranty expense was $28.9 million in 2016 compared to $35.4 million in 2015. 

Operating expenses The following table shows our operating expenses:

		For the year ended December 31,
						Percentage of							Percentage of
In thousands		2016				Sales			2015				Sales
Selling, general and administrative expenses		$	371,805			12.7	%		$	347,373			10.5	%
Engineering expenses		71,375				2.4	%		71,213				2.2	%
Amortization expense		22,698				0.8	%		21,663				0.7	%
Total operating expenses		$	465,878			15.9	%		$	440,249			13.4	%

Total operating expenses were 15.9% and 13.4% of sales for 2016 and 2015, respectively. Selling, general, and administrative expenses increased $24.4 million, or 7.0%, primarily due to $38.9 million of costs related to the Faiveley acquisition and $5.4 million in costs related to restructuring activity. These costs were partially offset by lower incentive and non-cash compensation expense and the effects of foreign exchange.  Engineering expense was consistent with the prior year.  Amortization expense increased $1.0 million due to amortization of intangibles associated with acquisitions.

    

30

---

The following table shows our segment operating expenses:

		For the year ended December 31,
										Percent
In thousands		2016				2015				Change
Freight Segment		$	182,718			$	208,773			(12.5	)%
Transit Segment		225,620				205,415				9.8	%
Corporate		57,540				26,061				120.8	%
Total operating expenses		$	465,878			$	440,249			5.8	%

Freight Segment operating expenses decreased $26.1 million, or 12.5%, in 2016 and increased 160 basis points to 11.8% of sales.  The decrease is primarily attributable to reduced sales volumes and realized benefits associated with the cost saving initiatives undertaken in 2016 partially offset by $8.8 million of incremental operating expenses from acquisitions.    

Transit Segment operating expenses increased $20.2 million, or 9.8%, in 2016 and decreased 10 basis points to 16.3% of sales.  The increase is primarily related to $26.2 million of incremental operating expenses related to acquisitions and $7.1 million related to the Faiveley Transport transaction.  This increase is partially offset by lower operating expenses due to foreign exchange. 

Corporate non-allocated operating expenses increased $31.5 million in 2016 primarily due to $31.8 million of costs related to the Faiveley acquisition partially offset by realized benefits from cost saving initiatives in 2016.

Interest expense, net Overall interest expense, net, increased $25.7 million in 2016 due to a higher overall debt balance in 2016 compared to 2015, primarily related to the Faiveley Transport acquisition and $14.9 million of debt refinancing costs. Refer to Note 8 of "Notes to Condensed Consolidated Financial Statements" included in Part IV, Item 15 of this report for additional information on debt.

Other expense, net Other expense, net, decreased $2.3 million to $3.0 million for 2016, compared to 2015 primarily due to foreign exchange adjustments.  

Income taxes The effective income tax rate was 24.1% and 31.9% in 2016 and 2015, respectively. The decrease in the effective rate is primarily the result of an enacted tax rate change which reduces the corporate income tax rate in France and a higher earnings mix in lower tax rate jurisdictions, partially offset by 2016 transaction charges related to the acquisition of Faiveley Transport that are not deductible.

31

---

Liquidity and Capital Resources

Liquidity is provided by operating cash flow and borrowings under the Company’s unsecured credit facility with a consortium of commercial banks. The following is a summary of selected cash flow information and other relevant data:

		For the year ended December 31,
In thousands		2017				2016				2015
Cash provided by (used for):
Operating activities		$	188,811			$	450,530			$	450,844
Investing activities		(275,729		)		(775,065		)		(380,136		)
Financing activities:
Proceeds from debt		1,216,740				1,875,000				787,400
Payments of debt		(1,269,537		)		(1,102,748		)		(612,680		)
Stock repurchases		—				(212,176		)		(387,787		)
Cash dividends		(42,218		)		(32,430		)		(26,963		)
Other		(2,416		)		(4,675		)		(11,468		)

 

Operating activities. Cash provided by operations in 2017 was $188.8 million compared with $450.5 million in 2016. In comparison to 2016, cash provided by operations decreased due to unfavorable working capital performance and lower net income of $51.1 million. The major components of working capital were as follows: an unfavorable change of $88.4 million in accounts receivable primarily due to higher sales, an unfavorable change in accounts payable of $72.8 million due to the timing of payments to suppliers, an unfavorable change of $25.4 million in other assets and liabilities primarily due to an unfavorable change in accrued liabilities due to payments related to contract liabilities, accrued expenses, and acquisition costs in 2017, and an unfavorable change in inventory of $54.3 million due to efforts to ramp up production in anticipation of stronger product demand in 2018.

Cash provided by operations in 2016 was $450.5 million compared with $450.8 million in 2015. In comparison to 2015, cash provided by operations in 2016 changed due to favorable working capital requirements partially offset by lower operating results. The favorable working capital requirements primarily related to a $57.7 million favorable change in accounts payable principally due to the timing of payments, $25.2 million favorable change in inventory driven by successful efforts to control the amount of inventory on hand. These favorable changes in working capital were partially offset by an unfavorable change in accrued income taxes of $33.5 million driven by lower income taxes owed at the end of 2016 given the decrease in pretax income.

Investing activities. In 2017, 2016 and 2015, cash used in investing activities was $275.7 million, $775.1 million and $380.1 million, respectively. The major components of the cash outflow in 2017 were planned additions to property, plant, and equipment of $89.5 million for continued investments in our facilities and manufacturing processes and $921.5 million in net cash paid for acquisitions.  These outflows were partially offset by $734.0 million in cash released from escrow related to the Faiveley acquisition. This compares to $50.2 million for property, plant, and equipment and $183.1 million in net cash paid for acquisitions in 2016.  Additionally in 2016, $744.7 million of cash was deposited into escrow to finance the purchase of the noncontrolling interest of Faiveley Transport, which was partially offset by $202.9 million of cash deposited into escrow to finance the purchase of a controlling interest in Faiveley Transport in 2015 and subsequently released from escrow in 2016. Refer to Note 3 of “Notes to Condensed Consolidated Financial Statements” included in Part IV, Item 15 of this report for additional information on acquisitions.

Financing activities. In 2017, cash used for financing activities was $97.4 million, which included $1,216.7 million in proceeds from the revolving credit facility, $1,269.5 million in repayments of debt, and $42.2 million of dividend payments. In 2016, cash provided by financing activities was $523.0 million, which included $1,125.0 million in proceeds from the revolving credit facility debt, $770.0 million of repayments of debt on the revolving credit facility, $332.7 million in repayments of other debt, which was primarily driven by repayments of debt acquired from the purchase of Faiveley Transport, $750.0 million of new borrowings on the 2026 Senior Notes, $32.4 million of dividend payments and $212.2 million of Wabtec stock repurchases.

32

---

The following table shows outstanding indebtedness at December 31, 2017 and 2016:

		December 31,
In thousands		2017				2016
3.45% Senior Notes due 2026, net of unamortized debt issuance costs of $2,345 and $2,526		$	747,655			$	747,474
4.375% Senior Notes due 2023, net of unamortized discount and debt issuance costs of $1,433 and $1,690		248,567				248,310
Revolving Credit Facility and Term Loan, net of unamortized debt issuance costs of $2,451 and $3,850		853,124				796,150
Schuldschein Loan		11,998				98,671
Other Borrowings		6,860				1,153
Capital Leases		2,324				1,018
Total		1,870,528				1,892,776
Less - current portion		47,225				129,809
Long-term portion		$	1,823,303			$	1,762,967

 

Wabtec's acquisition of the controlling stake of Faiveley Transport triggered the early repayment of a syndicated loan and the mandatory offer to investors to repay the US and Schuldschein private placements. Both the syndicated loan and US private placements were repaid in full in December 2016.

3.45% Senior Notes Due 2026

In October 2016, the Company issued $750.0 million of Senior Notes due 2026 (the “2016 Notes”).  The 2016 Notes were issued at 99.965% of face value.  Interest on the 2016 Notes accrues at a rate of 3.45% per annum and is payable semi-annually on May 15 and November 15 of each year.  The proceeds were used to finance the cash portion of the Faiveley Transport acquisition, refinance Faiveley Transport’s indebtedness, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.7 million of deferred financing costs related to the issuance of the 2016 Notes.  

The 2016 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2016 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens.

The Company is in compliance with the restrictions and covenants in the indenture under which the 2016 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities.

4.375% Senior Notes Due 2023

In August 2013, the Company issued $250.0 million of Senior Notes due 2023 (the “2013 Notes”).  The 2013 Notes were issued at 99.879% of face value.  Interest on the 2013 Notes accrues at a rate of 4.375% per annum and is payable semi-annually on February 15 and August 15 of each year.  The proceeds were used to repay debt outstanding under the Company’s existing credit agreement, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.6 million of deferred financing costs related to the issuance of the 2013 Notes.  

The 2013 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2013 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens.

The Company is in compliance with the restrictions and covenants in the indenture under which the 2013 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities.

2016 Refinancing Credit Agreement

On June 22, 2016, the Company amended its existing revolving credit facility with a consortium of commercial banks. This “2016 Refinancing Credit Agreement” provides the Company with a $1.2 billion, 5 year revolving credit facility and a

33

---

$400.0 million delayed draw term loan (the “Term Loan”). The Company incurred approximately $3.3 million of deferred financing cost related to the 2016 Refinancing Credit Agreement. The facility expires on June 22, 2021. The 2016 Refinancing Credit Agreement borrowings bear variable interest rates indexed as described below. At December 31, 2017, the Company had available bank borrowing capacity, net of $35.4 million of letters of credit, of approximately $679.0 million, subject to certain financial covenant restrictions.

The Term Loan was drawn on November 25, 2016. The Company incurred a 10 basis point commitment fee from June 22, 2016 until the initial draw on November 25, 2016.

Under the 2016 Refinancing Credit Agreement, the Company may elect a Base Rate of interest for U.S. Dollar denominated loans or, for certain currencies, an interest rate based on the London Interbank Offered Rate (“LIBOR”) of interest, or other rates appropriate for such currencies (in any case, “the Alternate Rate”). The Base Rate adjusts on a daily basis and is the greater of the Federal Funds Effective Rate plus 0.50% per annum, the PNC, N.A. prime rate or the Daily LIBOR Rate plus 100 basis points, plus a margin that ranges from 0 to 75 basis points. The Alternate Rate is based on the quoted rates specific to the applicable currency, plus a margin that ranges from 75 to 175 basis points. Both the Base Rate and Alternate Rate margins are dependent on the Company’s consolidated total indebtedness to EBITDA ratios. The initial Base Rate margin is 0 basis points and the Alternate Rate margin is 175 basis points.

At December 31, 2016, the weighted average interest rate on the Company’s variable rate debt was 2.92%.  On January 12, 2012, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million. The effective date of the interest rate swap agreement is July 31, 2013, and the termination date was November 7, 2016. The impact of the interest rate swap agreement converted a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing. During the term of the interest rate swap agreement the interest rate on the notional value was fixed at 1.415% plus the Alternate Rate margin. On June 5, 2014, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million.  The effective date of the interest rate swap agreement is November 7, 2016, and the termination date is December 19, 2018.  The impact of the interest rate swap agreement converts a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing.  During the term of the interest rate swap agreement the interest rate on the notional value will be fixed at 2.56% plus the Alternate Rate margin.  As for these agreements, the Company is exposed to credit risk in the event of nonperformance by the counterparties.  However, since only the cash interest payments are exchanged, exposure is significantly less than the notional amount.  The counterparties are large financial institutions with excellent credit ratings and history of performance.  The Company currently believes the risk of nonperformance is negligible.

The 2016 Refinancing Credit Agreement limits the Company’s ability to declare or pay cash dividends and prohibits the Company from declaring or making other distributions, subject to certain exceptions. The 2016 Refinancing Credit Agreement contains various other covenants and restrictions including the following limitations: incurrence of additional indebtedness; mergers, consolidations, sales of assets and acquisitions; additional liens; sale and leasebacks; permissible investments, loans and advances; certain debt payments; and imposes a minimum interest expense coverage ratio of 3.0 and a maximum debt to EBITDA ratio of 3.25. The Company is in compliance with the restrictions and covenants of the 2016 Refinancing Credit Agreement and does not expect that these measurements will limit the Company in executing our operating activities.

Schuldschein Loan, Due 2016

In conjunction with the acquisition of Faiveley Transport, Wabtec acquired $137.2 million of a Schuldshein private placement loan which was originally issued by Faiveley Transport on March 5, 2014 in Germany, in which approximately 20 international investors participated. This loan is denominated in euros. Subsequent to the acquisition of Faiveley Transport, the Company repaid $125.3 million of the outstanding Schuldschein loan. The remaining balance of $12.0 million as of December 31, 2017 matures on March 5, 2024 and bears a fixed rate of 4.00%.

34

---

Contractual Obligations and Off-Balance Sheet Arrangements

The Company is obligated to make future payments under various contracts such as debt agreements, lease agreements and has certain contingent commitments such as debt guarantees. The Company has grouped these contractual obligations and off-balance sheet arrangements into operating activities, financing activities, and investing activities in the same manner as they are classified in the Statement of Consolidated Cash Flows to provide a better understanding of the nature of the obligations and arrangements and to provide a basis for comparison to historical information. The table below provides a summary of contractual obligations and off-balance sheet arrangements as of December 31, 2017:

 

						Less than				1 - 3				3 - 5				More than
In thousands		Total				1 year				years				years				5 years
Operating activities:
Purchase obligations (1)		$	148,598			$	22,871			$	64,661			$	17,850			$	43,216
Operating leases (2)		187,406				31,647				53,024				36,694				66,041
Pension benefit payments (3)		174,551				15,651				32,185				34,622				92,093
Postretirement benefit payments (4)		11,371				1,254				2,455				2,354				5,308
Financing activities:
Interest payments (5)		365,772				62,573				104,500				89,582				109,117
Long-term debt (6)		1,870,528				47,225				331,460				483,587				1,008,256
Dividends to shareholders (7)		46,096				46,096				—				—				—
Other:
Standby letters of credit (8)		36,803				12,704				4,314				16,690				3,095
Total		$	2,841,125			$	240,021			$	592,599			$	681,379			$	1,327,126

 

(1)

Purchase obligations represent non-cancelable contractual obligations at December 31, 2017.  In addition, the Company had $368.3 million of open purchase orders for which the related goods or services had not been received.  Although open purchase orders are considered enforceable and legally binding, their terms generally allow us the option to cancel, reschedule and adjust our requirements based on our business needs prior to the delivery of goods or performance of services.

(2)	Future minimum payments for operating leases are disclosed by year in Note 14 of the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

(3)

Annual payments to participants are expected to continue into the foreseeable future at the amounts or ranges noted. Pension benefit payments are based on actuarial estimates using current assumptions for discount rates, expected return on long-term assets and rate of compensation increases. The Company expects to contribute about $7.3 million to pension plan investments in 2018. See further disclosure in Note 9 of the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

(4)	Annual payments to participants are expected to continue into the foreseeable future at the amounts or ranges noted. Postretirement payments are based on actuarial estimates using current assumptions for discount rates and health care costs. See further disclosure in Note 9 of the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

(5)	Interest payments are payable May and November of each year at 3.45% of $750 million Senior Notes due in 2026. Interest payments are payable February and August of each year at 4.375% of $250 million Senior Notes due in 2023. Interest payments for the Revolving Credit Facility and Capital Leases are based on contractual terms and the Company’s current interest rates.

(6)	Scheduled principal repayments of outstanding loan balances are disclosed in Note 8 of the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

(7)	Shareholder dividends are subject to approval by the Company’s Board of Directors, currently at an annual rate of approximately $46.1 million.

(8)	The $36.8 million of standby letters of credit is comprised of $35.3 million in outstanding letters of credit for performance and bid bond purposes and $1.5 million in interest, which expire in various dates through 2050. Amounts include interest payments based on contractual terms and the Company’s current interest rate.

The above table does not reflect uncertain tax positions of $6.9 million, the timing of which are uncertain except for $5.2 million that may become payable during 2017. Refer to Note 10 of the “Notes to Consolidated Financial Statements” for additional information on uncertain tax positions.

Obligations for operating activities. The Company has entered into $148.6 million of material long-term non-cancelable materials and supply purchase obligations. Operating leases represent multi-year obligations for rental of facilities and

35

---

equipment. Estimated pension funding and post-retirement benefit payments are based on actuarial estimates using current assumptions for discount rates, expected return on long-term assets, rate of compensation increases and health care cost trend rates. Benefits paid for pension obligations were $16.0 million and $13.3 million in 2017 and 2016, respectively. Benefits paid for post-retirement plans were $1.2 million and $0.9 million in 2017 and in 2016, respectively.

Obligations for financing activities. Cash requirements for financing activities consist primarily of long-term debt repayments, interest payments and dividend payments to shareholders. The Company has historically paid quarterly dividends to shareholders, subject to quarterly approval by our Board of Directors, currently at a rate of approximately $46.1 million annually.

The Company arranges for performance bonds to be issued by third party insurance companies to support certain long term customer contracts. At December 31, 2017, the initial value of performance bonds issued on the Company’s behalf is about $461 million.

Forward Looking Statements

We believe that all statements other than statements of historical facts included in this report, including certain statements under “Business” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” may constitute forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events. Although we believe that our assumptions made in connection with the forward-looking statements are reasonable, we cannot assure that our assumptions and expectations are correct.

These forward-looking statements are subject to various risks, uncertainties and assumptions about us, including, among other things:

Economic and industry conditions

•	prolonged unfavorable economic and industry conditions in the markets served by us, including North America, South America, Europe, Australia, Asia, and South Africa;

•	decline in demand for freight cars, locomotives, passenger transit cars, buses and related products and services;

•	reliance on major original equipment manufacturer customers;

•	original equipment manufacturers’ program delays;

•	demand for services in the freight and passenger rail industry;

•	demand for our products and services;

•	orders either being delayed, canceled, not returning to historical levels, or reduced or any combination of the foregoing;

•	consolidations in the rail industry;

•	continued outsourcing by our customers;

•	industry demand for faster and more efficient braking equipment;

•	fluctuations in interest rates and foreign currency exchange rates; or

•	availability of credit;

Operating factors

•	supply disruptions;

•	technical difficulties;

•	changes in operating conditions and costs;

•	increases in raw material costs;

•	successful introduction of new products;

•	performance under material long-term contracts;

•	labor relations;

•	the outcome of our existing or any future legal proceedings, including litigation involving our principal customers and any litigation with respect to environmental matters, asbestos-related matters, pension liabilities, warranties, product liabilities or intellectual property claims;

•	completion and integration of acquisitions, including the acquisition of Faiveley Transport; or

•	the development and use of new technology;

Competitive factors

•	the actions of competitors; or

•	the outcome of negotiations with partners, suppliers, customers or others;

36

---

Political/governmental factors

•	political stability in relevant areas of the world;

•	future regulation/deregulation of our customers and/or the rail industry;

•	levels of governmental funding on transit projects, including for some of our customers;

•	political developments and laws and regulations, including those related to Positive Train Control; or

•	federal and state income tax legislation; and

•	the outcome of negotiations with governments.

Statements in this 10-K apply only as of the date on which such statements are made, and we undertake no obligation to update any statement to reflect events or circumstances after the date on which the statement is made or to reflect the occurrence of unanticipated events.

Critical Accounting Estimates

The preparation of the financial statements in accordance with generally accepted accounting principles requires Management to make judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses. Areas of uncertainty that require judgments, estimates and assumptions include the accounting for allowance for doubtful accounts, inventories, the testing of goodwill and other intangibles for impairment, warranty reserves, pensions and other postretirement benefits, stock based compensation and tax matters. Management uses historical experience and all available information to make these judgments and estimates, and actual results will inevitably differ from those estimates and assumptions that are used to prepare the Company’s financial statements at any given time. Despite these inherent limitations, Management believes that Management’s Discussion and Analysis of Financial Condition and Results of Operations (MD&A) and the financial statements and related footnotes provide a meaningful and fair perspective of the Company. A discussion of the judgments and uncertainties associated with accounting for derivatives and environmental matters can be found in Notes 2 and 17, respectively, in the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report.

A summary of the Company’s significant accounting policies is included in Note 2 in the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report and is incorporated by reference herein. Management believes that the application of these policies on a consistent basis enables the Company to provide the users of the financial statements with useful and reliable information about the Company’s operating results and financial condition.

Accounts Receivable and Allowance for Doubtful Accounts:

Description The Company provides an allowance for doubtful accounts to cover anticipated losses on uncollectible accounts receivable.

Judgments and Uncertainties  The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence.

Effect if Actual Results Differ From Assumptions  If our estimates regarding the collectability of troubled accounts, and/or our actual losses within our receivable portfolio exceed our historical experience, we may be exposed to the expense of increasing our allowance for doubtful accounts.

Inventories:

Description Inventories are stated at the lower of cost or market and are reviewed to ensure that an adequate provision is recognized for excess, slow moving and obsolete inventories.

Judgments and Uncertainties Cost is determined under the first-in, first-out (FIFO) method. Inventory costs include material, labor and overhead. The Company compares inventory components to prior year sales history and current backlog and anticipated future requirements. To the extent that inventory parts exceed estimated usage and demand, a reserve is recognized to reduce the carrying value of inventory. Also, specific reserves are established for known inventory obsolescence.

Effect if Actual Results Differ From Assumptions If the market value of our products were to decrease due to changing market conditions, the Company could be at risk of incurring write-downs to adjust inventory value to a market value lower than stated cost. If our estimates regarding sales and backlog requirements are inaccurate, we may be exposed to the expense of increasing our reserves for slow moving and obsolete inventory.

37

---

Goodwill and Indefinite-Lived Intangibles:

Description Goodwill and indefinite-lived intangibles are required to be tested for impairment at least annually. The Company performs its annual impairment test during the fourth quarter and more frequently when indicators of impairment are present. The Company reviews goodwill for impairment at the reporting unit level. The evaluation of impairment involves comparing the current fair value of the business to the recorded value (including goodwill).

Judgments and Uncertainties A number of significant assumptions and estimates are involved in the application of the impairment test, including the identification of macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, Wabtec specific events and share price trends and making the assessment on whether each relevant factor will impact the impairment test positively or negatively and the magnitude of any such amount.

Effect if Actual Results Differ From Assumptions Management considers historical experience and all available information at the time the fair values of its reporting units are estimated. However, actual amounts realized may differ from those used to evaluate the impairment of goodwill. If actual results are not consistent with our assumptions and judgments used in estimating future cash flows and asset fair values, we may be exposed to impairment losses that could be material to our results of operations. For example, based on the quantitative analysis performed as of October 1, 2017, a decline in the terminal growth rate by 50 basis points would decrease fair market value by $334 million, or an increase in the weighted-average cost of capital by 100 basis points would result in a decrease in fair market value by $984 million. Even with such changes the fair value of the reporting units would be greater than their net book values, necessitating no Step 2 calculations. See Note 2 in the “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report for additional discussion regarding impairment testing.

Warranty Reserves:

Description The Company provides warranty reserves to cover expected costs from repairing or replacing products with durability, quality or workmanship issues occurring during established warranty periods.

Judgments and Uncertainties In general, reserves are provided for as a percentage of sales, based on historical experience. In addition, specific reserves are established for known warranty issues and their estimable losses.

Effect if Actual Results Differ From Assumptions If actual results are not consistent with the assumptions and judgments used to calculate our warranty liability, the Company may be at risk of realizing material gains or losses.

Accounting for Pensions and Postretirement Benefits:

Description The Company provides pension and postretirement benefits for its employees.  These amounts are determined using actuarial methodologies and incorporate significant assumptions, including the rate used to discount the future estimated liability, the long-term rate of return on plan assets and several assumptions relating to the employee workforce (salary increases, medical costs, retirement age and mortality).

Judgments and Uncertainties Significant judgments and estimates are used in determining the liabilities and expenses for pensions and other postretirement benefits. The rate used to discount future estimated liabilities is determined considering the rates available at year-end on debt instruments that could be used to settle the obligations of the plan. The long-term rate of return is estimated by considering historical returns and expected returns on current and projected asset allocations and is generally applied to a five-year average market value of assets.  The differences between actual and expected asset returns are recognized in expense using the normal amortization of gains and losses per ASC 715.

Effect if Actual Results Differ From Assumptions If assumptions used in determining the pension and other postretirement benefits change significantly, these costs can fluctuate materially from period to period. The key assumptions in determining the pension and other postretirement expense and obligation include the discount rate, expected return on assets and health care cost trend rate. For example, a 1% decrease or increase in the discount rate used in determining the pension and postretirement expense would increase expense $1.2 million or decrease expense $1.8 million, respectively. A 1% decrease or increase in the discount rate used in determining the pension and postretirement obligation would increase the obligation $53.1 million or decrease the obligation $67.2 million, respectively. A 1% decrease or increase in the expected return on assets used in determining the pension expense would increase or decrease expense $3.0 million. If the actual asset values at December 31, 2017 had been 1% lower, the amortization of losses in the following year would decrease $0.2 million. A 1% decrease or increase in the health care cost trend rate used in determining the postretirement expense would increase or decrease the

38

---

expense less than $0.1 million. A 1% decrease or increase in the health care cost trend rate used in determining the postretirement obligation would increase or decrease the obligation $0.3 million.

Stock-based Compensation:

Description The Company has issued incentive stock units to eligible employees that vest upon attainment of certain cumulative three-year performance goals. The program is structured as a rolling three-year plan; each year starts a new three-year performance cycle with the most recently completed cycle being 2015-2017. No incentive stock units will vest for performance below the three-year cumulative threshold.  The Company utilizes an economic profit measure for this performance goal.  Economic profit is a measure of the extent to which the Company produces financial results in excess of its cost of capital.  Based on the Company’s achievement of the threshold and three-year cumulative performance, the stock units vested can range from 0% to 200% of the shares granted.

Judgments and Uncertainties Significant judgments and estimates are used in determining the estimated three-year performance, which is then used to estimate the total shares expected to vest over the three year vesting cycle and corresponding expense based on the grant date fair value of the award.  When determining the estimated three-year performance, the Company utilizes a combination of historical actual results, budgeted results and forecasts.  In the initial grant year of a performance cycle, the Company estimates the three-year performance at 100%.  As actual performance results for a cycle begin to accumulate and the Company completes its budgeting and forecasting cycles the performance estimates are updated.  These judgments and estimates are reviewed and updated on a quarterly basis.

Effect if Actual Results Differ From Assumptions If assumptions used in determining the estimated three-year performance change significantly, stock-based compensation expense related to the unvested incentive stock awards can fluctuate materially from period to period.  For example, a 10% decrease or increase in the estimated vesting percentage for incentive stock awards would decrease or increase stock-based compensation expense by approximately $0.7 million and $0.7 million, respectively.

Income Taxes:

Description Wabtec records an estimated liability or benefit for income and other taxes based on what it determines will likely be paid in various tax jurisdictions in which it operates in accordance with ASC 740-10 Accounting for Income Taxes and Accounting for Uncertainty in Income Taxes.

Judgments and Uncertainties The estimate of our tax obligations are uncertain because Management must use judgment to estimate the exposures associated with our various filing positions, as well as realization of our deferred tax assets. ASC 740-10 establishes a recognition and measurement threshold to determine the amount of tax benefit that should be recognized related to uncertain tax positions.

Effect if Actual Results Differ From Assumptions Management uses its best judgment in the determination of these amounts. However, the liabilities ultimately realized and paid are dependent on various matters including the resolution of the tax audits in the various affected tax jurisdictions and may differ from the amounts recorded. An adjustment to the estimated liability would be recorded through income in the period in which it becomes probable that the amount of the actual liability differs from the recorded amount. A deferred tax valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized.

Revenue Recognition:

Description Revenue is recognized in accordance with ASC 605 “Revenue Recognition.” The Company recognizes revenues on long-term contracts based on the percentage of completion method of accounting. The units-of-delivery method or other input-based or output-based measures, as appropriate, are used to measure the progress toward completion of individual contracts. Contract revenues and cost estimates are reviewed and revised at a minimum quarterly and adjustments are reflected in the accounting period as such amounts are determined. Certain pre-production costs relating to long term production and supply contracts have been deferred and will be recognized over the life of the contracts.

Judgments and Uncertainties Revenue is recognized when products have been shipped to the respective customers, title has passed and the price for the product has been determined. Contract accounting involves a judgmental process of estimating the total sales and costs for each contract, which results in the development of estimated profit margin percentages. For each contract with revenue recognized using the percentage of completion method, the amount reported as revenue is determined by calculating cost incurred to date as a percentage of the total expected contract costs to determine the percentage of total contract revenue to be recognized in the current period. Due to the size, duration and nature of many of our contracts, the estimation of

39

---

total sales and costs through completion is complicated and subject to many variables. Total contract sales estimates are based on negotiated contract prices and quantities, modified by our assumptions regarding contract options, change orders, and price adjustment clauses (such as inflation or index-based clauses). Total contract cost estimates are largely based on negotiated or estimated purchase contract terms, historical performance trends, business base and other economic projections. Factors that influence these estimates include inflationary trends, technical and schedule risk, internal and subcontractor performance trends, business volume assumptions, asset utilization, and anticipated labor agreements. For long-term contracts, revenues and cost estimates are reviewed and revised quarterly at a minimum and adjustments are reflected in the accounting period as such amounts are determined. Pre-production costs are recognized over the expected life of the contract usually based on the Company’s progress toward the estimated number of units expected to be delivered under the production or supply contract.

Effect if Actual Results Differ From Assumptions Should market conditions and customer demands dictate changes to our standard shipping terms, the Company may be impacted by longer than typical revenue recognition cycles. The development of expected contract costs and contract profit margin percentages involves procedures and personnel in all areas that provide financial or production information on the status of contracts. Due to the significance of judgment in the estimation process, it is likely that materially different revenue amounts could be recorded if we used different assumptions or if the underlying circumstances were to change. Changes in underlying assumptions/estimates, supplier performance, or circumstances may adversely or positively affect financial performance in future periods. If the combined profit margin for all contracts recognized on the percentage of completion method during 2017 had been estimated to be higher or lower by 1%, it would have increased or decreased revenue and gross profit for the year by approximately $29.8 million. A few of our contracts are expected to be completed in a loss position. Provisions are made currently for estimated losses on uncompleted contracts. A charge to expense for unrecognized portions of pre-production costs could be realized if the Company’s estimate of the number of units to be delivered changes or the underlying contract is cancelled.

 

Item 7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

In the ordinary course of business, Wabtec is exposed to risks that increases in interest rates may adversely affect funding costs associated with its variable-rate debt. The Company’s variable rate debt represents 38% and 36% of total long-term debt at December 31, 2017 and 2016, respectively. On an annual basis, a 1% change in the interest rate for variable rate debt at December 31, 2017 would increase or decrease interest expense by about $7.1 million.

To reduce the impact of interest rate changes on a portion of this variable-rate debt, the Company entered into interest rate swap agreements which effectively converted a portion of the debt from a variable to a fixed-rate borrowing during the term of the swap contracts. Refer to “Financial Derivatives and Hedging Activities” in Note 2 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report for additional information regarding interest rate risk.

Foreign Currency Exchange Risk

The Company is subject to certain risks associated with changes in foreign currency exchange rates to the extent our operations are conducted in currencies other than the U.S. dollar. For the year ended December 31, 2017, approximately 34% of Wabtec’s net sales were in the United States, 9% in the United Kingdom, 7% in Canada, 6% in France, 5% in China, 5% in Germany, 4% in Australia, 4% in Mexico, 4% in India, 4% in Italy, 2% in Brazil, and 16% in other international locations. (See Note 20 of “Notes in Consolidated Financial Statements” included in Part IV, Item 15 of this report). To reduce the impact of changes in currency exchange rates, the Company has periodically entered into foreign currency forward contracts. Refer to “Financial Derivatives and Hedging Activities” in Note 2 of “Notes to Consolidated Financial Statements” included in Part IV, Item 15 of this report for more information regarding foreign currency exchange risk.

Our market risk exposure is not substantially different from our exposure at December 31, 2016.

Item 8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Financial statements and supplementary data are set forth in Item 15 of Part IV hereof.

Item  9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

There have been no disagreements with our independent registered public accountants.

40

---

Item  9A.	CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Wabtec’s principal executive officer and its principal financial officer have evaluated the effectiveness of Wabtec’s “disclosure controls and procedures,” (as defined in Exchange Act Rule 13a-15(e)) as of December 31, 2017. Based upon their evaluation, the principal executive officer and principal financial officer concluded that Wabtec’s disclosure controls and procedures are effective to provide reasonable assurance that information required to be disclosed by Wabtec in the reports filed or submitted by it under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and to provide reasonable assurance that information required to be disclosed by Wabtec in such reports is accumulated and communicated to Wabtec’s Management, including its principal executive officer and principal finance officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There was no change in Wabtec’s “internal control over financial reporting” (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the quarter ended December 31, 2017, that has materially affected, or is reasonably likely to materially affect, Wabtec’s internal control over financial reporting. Management’s annual report on internal control over financial reporting and the attestation report of the registered public accounting firm are included in Part IV, Item 15 of this report.

Management’s Report on Internal Control over Financial Reporting

Management’s Report on Internal Control Over Financial Reporting appears on page 47 and is incorporated herein by reference.

Report of Independent Registered Public Accounting Firm on Internal Control over Financial Reporting

Ernst & Young LLP's attestation report on internal control over financial reporting appears on page 50 and is incorporated herein by reference.

Item  9B.	OTHER INFORMATION

None.

41

---

PART III

Items 10 through 14.

In accordance with the provisions of General Instruction G(3) to Form 10-K, the information required by Item 10 (Directors, Executive Officers and Corporate Governance), Item 11 (Executive Compensation), Item 12 (Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters), Item 13 (Certain Relationships and Related Transactions, and Director Independence) and Item 14 (Principal Accounting Fees and Services) is incorporated herein by reference from the Company’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held on May 7, 2018, except for the Equity Compensation Plan Information required by Item 12, which is set forth in the table below. The definitive Proxy Statement will be filed with the Securities and Exchange Commission not later than 120 days after December 31, 2017. Information relating to the executive officers of the Company is set forth in Part I.

Wabtec has adopted a Code of Ethics for Senior Officers which is applicable to our executive officers. As described in Item 1 of this report the Code of Ethics for Senior Officers is posted on our website at www.wabtec.com. In the event that we make any amendments to or waivers from this code, we will disclose the amendment or waiver and the reasons for such on our website.

This table provides aggregate information as of December 31, 2017 concerning equity awards under Wabtec’s compensation plans and arrangements.

		(a) Number of securities to be issued upon exercise of outstanding options,			(b) Weighted-average exercise price of outstanding options warrants				(c) Number of securities remaining available for future issuance under equity compensation plans (excluding securities
Plan Category		warrants and rights			and rights				reflected in column (a))
Equity compensation plans approved by shareholders		983,512			$	40.62			3,192,453
Equity compensation plans not approved by shareholders		—			—				—
Total		983,512			$	40.62			3,192,453

42

---

PART IV

Item  15.	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

The financial statements, financial statement schedules and exhibits listed below are filed as part of this annual report: 

		Page
(1)	Financial Statements and Reports on Internal Control
	Management’s Reports to Westinghouse Air Brake Technologies Corporation Shareholders	47
	Report of Independent Registered Public Accounting Firm	48
	Report of Independent Registered Public Accounting Firm	49
	Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting	50
	Consolidated Balance Sheets as of December 31, 2017 and 2016	51
	Consolidated Statements of Income for the three years ended December 31, 2017, 2016 and 2015	52
	Consolidated Statements of Comprehensive Income for the three years ended December 31, 2017, 2016 and 2015	53
	Consolidated Statements of Cash Flows for the three years ended December 31, 2017, 2016 and 2015	54
	Consolidated Statements of Shareholders’ Equity for the three years ended December 31, 2017, 2016 and 2015	55
	Notes to Consolidated Financial Statements	55
(2)	Financial Statement Schedules
	Schedule II—Valuation and Qualifying Accounts	95
		Filing Method
	Exhibits
2.1	Share Purchase Agreement among Financiere Faiveley S.A., Famille Faiveley Participations Francois Faiveley, Erwan Faiveley, FW Acquisition, LLC and Wabtec Corporation dated as of October 6, 2015	16
2.2	Tender Offer Agreement among Faiveley Transport S.A., FW Acquisition, LLC, and Wabtec Corporation dated as of October 6, 2015	16
2.3	Shareholder's Agreement among Financiere Faiveley S.A., FW Acquisition, LLC, and Wabtec Corporation dated as of October 6, 2015	16
2.4	Amendment No. 1 to Share Purchase Agreement among Mr. Erwan Faiveley, Wabtec France, and Wabtec Corporation dated as of October 24, 2016	17
2.5	Amendment No. 1 to Tender Offer Agreement among Faiveley Transport, S.A., Wabtec France, and Wabtec Corporation dated as of October 24, 2016	17
2.6	Amendment No. 1 to Shareholder’s Agreement among Financiere Faiveley S.A., Famille Faiveley Participations, Francois Faiveley, Erwan Faiveley, and Wabtec Corporation dated as of dated as of October 24, 2016	17
3.1	Restated Certificate of Incorporation of the Company dated January 30, 1995, as amended December 31, 2003	9
3.2	Certificate of Amendment of Restated Certificate of Incorporation dated May 14, 2013	11
3.3	Amended By-Laws of the Company, effective May 14, 2014	8
4.1	Indenture, dated August 8, 2013 by and between the Company and Wells Fargo, National Association, as Trustee	12
4.2	First Supplemental Indenture, dated August 8, 2013, by and between the Company and Wells Fargo Bank, National Association, as Trustee	12

43

---

4.3	Form of 4.375% Senior Note due 2023 (included in Exhibit 4.2)	12
4.4	Second Supplemental Indenture, dated November 3, 2016, by and among Westinghouse Air Brake Technologies Corporation, the subsidiary guarantors named therein and Wells Fargo Bank, National Association, as Trustee	19
4.5	Third Supplemental Indenture, dated November 3, 2016, by and among Westinghouse Air Brake Technologies Corporation, the subsidiary guarantors named therein and Wells Fargo Bank, National Association, as Trustee	19
4.6	Form of 3.450% Senior Note due 2026 (included in Exhibit 4.5)	19
4.7	Fourth Supplemental Indenture, dated February 9, 2017, by and among Westinghouse Air Brake Technologies Corporation, the subsidiary guarantors named therein and Wells Fargo Bank, National Association, as Trustee	20
4.8	Fifth Supplemental Indenture, dated April 28, 2017, by and among Westinghouse Air Brake Technologies Corporation, the subsidiary guarantors named therein and Wells Fargo Bank, National Association, as Trustee	21
4.9	Sixth Supplemental Indenture, dated June 21, 2017, by and among Westinghouse Air Brake Technologies Corporation, the subsidiary guarantors named therein and Wells Fargo Bank, National Association, as Trustee.	22
10.1	Agreement of Sale and Purchase of the North American Operations of the Railway Products Group, an operating division of American Standard Inc. (now known as Trane), dated as of 1990 between Rail Acquisition Corp. and American Standard Inc. (only provisions on indemnification are reproduced)	2
10.2	Letter Agreement (undated) between the Company and American Standard Inc. (now known as Trane) on environmental costs and sharing	2
10.3	Purchase Agreement dated as of June 17, 1992 among the Company, Schuller International, Inc., Manville Corporation and European Overseas Corporation (only provisions on indemnification are reproduced)	2
10.4	Westinghouse Air Brake Company 1995 Non-Employee Directors’ Fee and Stock Option Plan, as amended and restated*	4
10.5	Westinghouse Air Brake Technologies Corporation 2000 Stock Incentive Plan, as amended *	4
10.6	Employment Agreement with Albert J. Neupaver, dated February 1, 2006 *	3
10.7	Form of Restricted Stock Agreement *	10
10.8	Westinghouse Air Brake Technologies Corporation 2011 Stock Incentive Plan as amended and restated*	5
10.9	Stock Purchase Agreement, by and among the Company, Standard Car Truck Company and Robclif, Inc., dated September 12, 2008	6
10.10	Second Amended and Restated Refinancing Credit Agreement, dated as of June 22, 2016, by and among the Company, Wabtec Cooperatief UA, as borrowers, certain subsidiaries of the Company as guarantors and the lenders party thereto and PNC Bank, National Association, as Administrative Agent, PNC Capital Markets LLC, Merrill Lynch, Pierce, Fenner & Smith Inc., JPMorgan Chase Bank, N.A., HSBC Bank, USA, National Association and Société Générale, as Joint Lead Arrangers and Joint Bookrunners, Bank of America, National Association and JPMorgan Chase Bank, N.A., as Co-Syndication Agents, and HSBC Bank USA, National Association and Société Générale, as Co-Documentation Agents.	14
10.11	First Amendment to Second Amended and Restated Refinancing Credit Agreement, dated as of April 19, 2017, by and among the Company, Wabtec Cooperatief UA, as a borrower, certain subsidiaries of the Company as guarantors, the lenders party thereto and PNC Bank, National Association, as Administrative Agent.	21
10.12	Second Amendment to Second Amended and Restated Refinancing Credit Agreement, dated as of October 11, 2017, by and among the Company, Wabtec Cooperatief UA, as a borrower, certain subsidiaries of the Company as guarantors, the lenders party thereto and PNC Bank, National Association, as Administrative Agent.	23
10.12	Form of Employment Continuation Agreement entered into by the Company with Albert J. Neupaver, Raymond T. Betler, David L. DeNinno, Patrick D. Dugan, Scott E. Wahlstrom, Michael E. Fetsko, Timothy R. Wesley and John A Mastalerz Jr.*	7
10.13	Amended and Restated Employment Agreement with Stephane Rambaud-Measson dated October 24, 2016*	20
10.14	Amended and Restated Employment Agreement with Guillaume Bouhours dated October 24, 2016*	20
10.15	Wabtec Corporation Deferred Compensation Plan for Executive Officers and Directors as adopted December 10, 2009 *	10
10.16	Form of Agreement for Nonstatutory Stock Option under the 1995 Non-Employee Directors’ Fee and Stock Option Plan, as amended and restated*	10

44

---

10.17	Form of Agreement for Nonstatutory Stock Options under 2000 Stock Incentive Plan, as amended *	10
10.18	Form of Agreement for Nonstatutory Stock Options under 2011 Stock Incentive Plan as amended and restated*	10
21.0	List of subsidiaries of the Company	1
23.1	Consent of Ernst & Young LLP	1
23.2	Consent of Independent Accountants	1
31.1	Rule 13a-14(a)/15d-14(a) Certifications	1
31.2	Rule 13a-14(a)/15d-14(a) Certifications	1
32.1	Section 1350 Certifications	1
101.INS	XBRL Instance Document.	1
101.SCH	XBRL Taxonomy Extension Calculation Linkbase Document	1
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document	1
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.	1
101.LAB	XBRL Taxonomy Extension Label Linkbase Document	1
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document	1

 

1		Filed herewith.

2		Filed as an exhibit to the Company’s Registration Statement on Form S-1 (File No. 33-90866).

3		Filed as an exhibit to the Company’s Quarterly Report on Form 10-Q (File No. 033-90866) for the period ended March 31, 2006.

4		Filed as an Annex to the Company’s Schedule 14A Proxy Statement (File No. 1-13782) filed on April 13, 2006.

5		Filed as an Annex to the Company’s Schedule 14A Proxy Statement (File No. 1-13782) filed on March 31, 2011.

6		Filed as an exhibit to the Company’s Quarterly Report on Form 10-Q (File No. 1-13782) for the period ended September 30, 2008.

7		Filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 1-13782) dated July 2, 2009.

8		Filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 1-13782), dated May 19, 2014.

9		Filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 1-13782), dated February 25, 2011.

10		Filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 1-13782), dated February 22, 2013.

11		Filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 1-13782), dated May 15, 2013.

12		Filed as an exhibit to the Company’s Current Report on Form 8-K (File No. 1-13782), dated August 8, 2013.

45

---

13		Filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 1-13782), dated February 21, 2014.
14		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated June 24, 2016.
15		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated July 30, 2015.
16		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated October 6, 2015.
17		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated October 26, 2016.
18		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated November 1, 2016.
19		Filed as an exhibit to the Company's Current Report on Form 8-K (File No. 1-13782), dated November 3, 2016.
20		Filed as an exhibit to the Company’s Annual Report on Form 10-K (File No. 1-13782), dated February 28, 2017.
21		Filed as an exhibit to the Company’s Quarterly Report on Form 10-Q (File No. 1-13782) for the period ended March 31, 2017.
22		Filed as an exhibit to the Company’s Registration Statement on Form S-4 (File No. 333-219354).
23		Filed as an exhibit to the Company’s Quarterly Report on Form 10-Q (File No. 1-13782) for the period ended September 30, 2017.

*	Management contract or compensatory plan.

46

---

 MANAGEMENT’S REPORTS TO WABTEC SHAREHOLDERS

Management’s Report on Financial Statements and Practices

The accompanying consolidated financial statements of Westinghouse Air Brake Technologies Corporation and subsidiaries (the “Company”) were prepared by Management, which is responsible for their integrity and objectivity. The statements were prepared in accordance with U.S. generally accepted accounting principles and include amounts that are based on Management’s best judgments and estimates. The other financial information included in the 10-K is consistent with that in the financial statements.

Management also recognizes its responsibility for conducting the Company’s affairs according to the highest standards of personal and corporate conduct. This responsibility is characterized and reflected in key policy statements issued from time to time regarding, among other things, conduct of its business activities within the laws of host countries in which the Company operates and potentially conflicting outside business interests of its employees. The Company maintains a systematic program to assess compliance with these policies.

Management’s Report on Internal Control over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. In order to evaluate the effectiveness of internal control over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act, Management has conducted an assessment, including testing, using the criteria in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) (COSO). The Company’s system of internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting standards. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management has excluded Aero Transportation Products ("ATP"), Thermal Transfer Corporation ("TTC"), Semvac Group ("Semvac"), AM General Contractor ("AM General"), and Melett Limited ("Melett") from its assessment of internal controls over financial reporting as of December 31, 2017 because the Company acquired ATP effective March 13, 2017, TTC effective April 5, 2017, Semvac effective April 28, 2017, AM General effective October 2, 2017, and Melett effective December 4, 2017. ATP, TTC, Semvac, AM General, and Melett are subsidiaries whose total assets represents 1.1%, 0.6%, 0.3%, 0.9%, and 1.5%, respectively, and whose customer revenues represents 0.9%, 0.4%, 0.3%, 0.2%, and 0.1%, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2017.

Based on its assessment, Management has concluded that the Company maintained effective internal control over financial reporting as of December 31, 2017, based on criteria in Internal Control-Integrated Framework issued by the COSO. The effectiveness of the Company’s internal control over financial reporting as of December 31, 2017, has been audited by Ernst & Young LLP, independent registered public accounting firm, as stated in their report which is included herein.

47

---

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of Westinghouse Air Brake Technologies Corporation

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Westinghouse Air Brake Technologies Corporation (the Company) as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, shareholders' equity and cash flows for each of the three years in the period ended December 31, 2017, and the related notes and schedule as listed in the Index at Item 15.(2) (collectively referred to as the “consolidated financial statements”). In our opinion, based on our audits and the report of other auditors, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017 in conformity with U.S. generally accepted accounting principles.

We did not audit the pre-acquisition historical basis consolidated financial statements of Faiveley Transport S.A., a consolidated subsidiary, which statements reflect total assets constituting 25.9% in 2016, and total revenues constituting 3.8% in 2016 of the related consolidated totals. Those statements were audited by other auditors whose report has been furnished to us, and our opinion, insofar as it relates to the amounts included for Faiveley Transport S.A., is based solely on the report of the other auditors. We audited the adjustments necessary to convert the pre-acquisition historical amounts included for Faiveley Transport S.A. to the basis reflected in the Company’s 2016 consolidated financial statements.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 26, 2018 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits and the report of other auditors provide a reasonable basis for our opinion.

/s/ ERNST & YOUNG LLP

We have served as the Company's auditor since 2002.

Pittsburgh, Pennsylvania

February 26, 2018

48

---

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Management Board of Faiveley Transport

In our opinion, the consolidated balance sheets and the related consolidated statement of income, comprehensive income, shareholders’ equity and cash flows present fairly, in all material respects, the financial position of Faiveley Transport and its subsidiaries as of December 31, 2016 and November 30, 2016, and the results of their operations and their cash flows for the period from November 30, 2016 to December 31, 2016 (not presented separately herein), in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. As discussed in Note 3, the company has not applied push down accounting for its acquisition by Wabtec.

PricewaterhouseCoopers Audit

/s/ Philippe Vincent

Partner

Neuilly-sur-Seine, France

February 23, 2017

49

---

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of Westinghouse Air Brake Technologies Corporation

Opinion on Internal Control over Financial Reporting

We have audited Westinghouse Air Brake Technologies Corporation’s internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Westinghouse Air Brake Technologies Corporation (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on the COSO criteria.

As indicated in the accompanying Management’s Report on Internal Control over Financial Reporting, management’s assessment of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of Aero Transportation Products (“ATP”), Thermal Transfer Corporation (“TTC”), Semvac Group ("Semvac"), AM General Contractor (“AM General”), and Melett Limited ("Melett"), which are included in the 2017 consolidated financial statements of the Company and constituted 1.1%, 0.6%, 0.3%, 0.9%, and 1.5% of total assets, respectively, as of December 31, 2017 and 0.9%, 0.4%, 0.3%, 0.2%, and 0.1% of revenues, respectively, for the year then ended. Our audit of internal control over financial reporting of the Company also did not include an evaluation of the internal control over financial reporting of ATP, TTC, Semvac, AM General, and Melett.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2017 and 2016, the related consolidated statements of comprehensive income, shareholders’ equity and cash flows for each of the three years in the period ended December 31, 2017, and the related notes and schedule as listed in the Index at Item 15.(2) and our report dated February 26, 2018 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

Pittsburgh, Pennsylvania

February 26, 2018

50

---

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

CONSOLIDATED BALANCE SHEETS

		December 31,
In thousands, except shares and par value		2017				2016
Assets
Current Assets
Cash and cash equivalents		$	233,401			$	398,484
Accounts receivable		800,619				667,596
Unbilled accounts receivable		366,168				274,912
Inventories		742,634				658,510
Deposits in escrow		—				744,748
Other assets		122,291				123,381
Total current assets		2,265,113				2,867,631
Property, plant and equipment		1,026,046				912,230
Accumulated depreciation		(452,074		)		(393,854		)
Property, plant and equipment, net		573,972				518,376
Other Assets
Goodwill		2,460,103				2,078,765
Other intangibles, net		1,204,432				1,053,860
Other noncurrent assets		76,360				62,386
Total other assets		3,740,895				3,195,011
Total Assets		$	6,579,980			$	6,581,018
Liabilities and Shareholders’ Equity
Current Liabilities
Accounts payable		$	552,525			$	530,211
Customer deposits		369,716				256,591
Accrued compensation		164,210				145,324
Accrued warranty		137,542				123,190
Current portion of long-term debt		47,225				129,809
Other accrued liabilities		302,112				261,514
Total current liabilities		1,573,330				1,446,639
Long-term debt		1,823,303				1,762,967
Accrued postretirement and pension benefits		103,734				110,597
Deferred income taxes		175,902				245,680
Accrued warranty		15,521				15,802
Other long-term liabilities		59,658				22,508
Total liabilities		3,751,448				3,604,193
Commitment and Contingencies (Note 19)
Equity
Preferred stock, 1,000,000 shares authorized, no shares issued		—				—
Common stock, $.01 par value; 200,000,000 shares authorized:
132,349,534 shares issued and 96,034,352 and 95,425,432 outstanding
at December 31, 2017 and December 31, 2016, respectively		1,323				1,323
Additional paid-in capital		906,616				869,951
Treasury stock, at cost, 36,315,182 and 36,924,102 shares, at
December 31, 2017 and December 31, 2016, respectively		(827,379		)		(838,950		)
Retained earnings		2,773,300				2,553,258
Accumulated other comprehensive loss		(44,992		)		(379,605		)
Total Westinghouse Air Brake Technologies Corporation shareholders' equity		2,808,868				2,205,977
Noncontrolling interest		19,664				770,848
Total equity		2,828,532				2,976,825
Total Liabilities and Equity		$	6,579,980			$	6,581,018

 

The accompanying notes are an integral part of these statements.

51

---

 WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

		Year Ended December 31,
		2017				2016				2015
In thousands, except per share data
Net sales		$	3,881,756			$	2,931,188			$	3,307,998
Cost of sales		(2,816,443		)		(2,006,949		)		(2,260,182		)
Gross profit		1,065,313				924,239				1,047,816
Selling, general and administrative expenses		(511,898		)		(371,805		)		(347,373		)
Engineering expenses		(95,166		)		(71,375		)		(71,213		)
Amortization expense		(36,516		)		(22,698		)		(21,663		)
Total operating expenses		(643,580		)		(465,878		)		(440,249		)
Income from operations		421,733				458,361				607,567
Other income and expenses
Interest expense, net		(68,704		)		(42,561		)		(16,888		)
Other (expense) income, net		(966		)		(2,963		)		(5,311		)
Income from operations before income taxes		352,063				412,837				585,368
Income tax expense		(89,773		)		(99,433		)		(186,740		)
Net income		262,290				313,404				398,628
Less: Net income attributable to noncontrolling interest		(29		)		(8,517		)		—
Net income attributable to Wabtec shareholders		$	262,261			$	304,887			$	398,628
Earnings Per Common Share
Basic
Net income attributable to Wabtec shareholders		$	2.74			$	3.37			$	4.14
Diluted
Net income attributable to Wabtec shareholders		$	2.72			$	3.34			$	4.10
Weighted average shares outstanding
Basic		95,453				90,359				96,074
Diluted		96,125				91,141				97,006

 

The accompanying notes are an integral part of these statements.

52

---

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

 

		Year Ended December 31,
		2017				2016				2015
In thousands, except per share data
Net income attributable to Wabtec shareholders		$	262,261			$	304,887			$	398,628
Foreign currency translation gain (loss)		326,096				(93,684		)		(132,899		)
Unrealized gain (loss) on derivative contracts		9,799				305				(1,202		)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans		2,845				(12,021		)		26,689
Other comprehensive gain (loss) before tax		338,740				(105,400		)		(107,412		)
Income tax (expense) benefit related to components of
other comprehensive loss		(4,127		)		2,514				(9,821		)
Other comprehensive income (loss), net of tax		334,613				(102,886		)		(117,233		)
Comprehensive income attributable to Wabtec shareholders		$	596,874			$	202,001			$	281,395

  

The accompanying notes are an integral part of these statements.

53

---

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

 

		December 31,
		2017				2016				2015
In thousands, except per share data
Operating Activities
Net income		$	262,290			$	313,404			$	398,628
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization		103,248				69,795				64,734
Stock-based compensation expense		21,287				20,813				26,019
Deferred income taxes		(67,423		)		(10,228		)		4,981
Loss on disposal of property, plant and equipment		1,907				232				587
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable		(68,676		)		19,728				21,500
Inventories		(8,955		)		45,340				20,147
Accounts payable		(91,722		)		(18,932		)		(76,650		)
Accrued income taxes		47,644				(11,759		)		21,740
Accrued liabilities and customer deposits		(18,891		)		(11,338		)		(14,837		)
Other assets and liabilities		8,102				33,475				(16,005		)
Net cash provided by operating activities		188,811				450,530				450,844
Investing Activities
Purchase of property, plant and equipment		(89,466		)		(50,216		)		(49,428		)
Proceeds from disposal of property, plant and equipment		1,291				363				1,784
Acquisitions of business, net of cash acquired		(921,537		)		(183,113		)		(129,550		)
Deposit in escrow		733,983				(542,099		)		(202,942		)
Net cash used for investing activities		(275,729		)		(775,065		)		(380,136		)
Financing Activities
Proceeds from debt		1,216,740				1,875,000				787,400
Payments of debt		(1,269,537		)		(1,102,748		)		(612,680		)
Stock re-purchase		—				(212,176		)		(387,787		)
Proceeds from exercise of stock options and other benefit plans		4,428				1,983				3,097
Payment of income tax withholding on share-based compensation		(6,844		)		(6,658		)		(14,565		)
Cash dividends ($0.44, $0.36 and $0.28 per share for the years
ended December 31, 2017, 2016 and 2015)		(42,218		)		(32,430		)		(26,963		)
Net cash (used for) provided by financing activities		(97,431		)		522,971				(251,498		)
Effect of changes in currency exchange rates		19,266				(26,143		)		(18,868		)
(Decrease) increase in cash		(165,083		)		172,293				(199,658		)
Cash, beginning of year		398,484				226,191				425,849
Cash, end of year		$	233,401			$	398,484			$	226,191

 

The accompanying notes are an integral part of these statements.

54

---

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

		Common Stock			Common Stock				Additional Paid-in				Treasury Stock			Treasury Stock				Retained				Accumulated Other				Non-controlling
In thousands, except share and per share data		Shares			Amount				Capital				Shares			Amount				Earnings				Comprehensive Income (Loss)				Interest				Total
Balance, December 31, 2014		132,349,534			$	1,323			$	448,531			(36,075,139	)		$	(392,262	)		$	1,909,136			$	(159,486	)		$	1,732			$	1,808,974
Cash dividends ($0.28 dividend per share)		—			—				—				—			—				(26,963		)		—				—				(26,963		)
Proceeds from treasury stock issued from the exercise of stock
options and other benefit plans, net of tax		—			—				(2,918		)		450,738			4,925				—				—				—				2,007
Stock based compensation		—			—				23,713				—			—				—				—				—				23,713
Net income		—			—				—				—			—				398,628				—				—				398,628
Translation adjustment		—			—				—				—			—				—				(132,899		)		—				(132,899		)
Unrealized loss on foreign exchange contracts, net of $14 tax		—			—				—				—			—				—				(66		)		—				(66		)
Unrealized loss on interest rate swap contracts, net of $444 tax		—			—				—				—			—				—				(678		)		—				(678		)
Change in pension and post-retirement benefit plans, net of $10,279 tax		—			—				—				—			—				—				16,410				—				16,410
Stock re-purchase		—			—				—				(4,889,027	)		(387,787		)		—				—				—				(387,787		)
Balance, December 31, 2015		132,349,534			1,323				469,326				(40,513,428	)		(775,124		)		2,280,801				(276,719		)		1,732				1,701,339
Cash dividends ($0.36 dividend per share)		—			—				—				—			—				(32,430		)		—				—				(32,430		)
Proceeds from treasury stock issued from the exercise of stock
options and other benefit plans, net of tax		—			—				(8,490		)		328,245			5,038				—				—				—				(3,452		)
Stock based compensation		—			—				17,748				—			—				—				—				—				17,748
Non-controlling interests associated with Faiveley Transport Acquisition		—			—				—				—			—				—				—				760,599				760,599
Net income		—			—				—				—			—				304,887				—				8,517				313,404
Translation adjustment		—			—				—				—			—				—				(93,684		)		—				(93,684		)
Unrealized loss on foreign exchange contracts, net of $45 tax		—			—				—				—			—				—				(324		)		—				(324		)
Unrealized gain on interest rate swap contracts, net of $230 tax		—			—				—				—			—				—				354				—				354
Change in pension and post-retirement benefit plans, net of $2,790 tax		—			—				—				—			—				—				(9,232		)		—				(9,232		)
Stock issued for Faiveley Transport Acquisition		—			—				391,367				6,307,489			143,312				—				—				—				534,679
Stock re-purchase		—			—				—				(3,046,408	)		(212,176		)		—				—				—				(212,176		)
Balance, December 31, 2016		132,349,534			1,323				869,951				(36,924,102	)		(838,950		)		2,553,258				(379,605		)		770,848				2,976,825
Cash dividends ($0.44 dividend per share)		—			—				—				—			—				(42,218		)		—				—				(42,218		)
Proceeds from treasury stock issued from the exercise of stock
options and other benefit plans, net of tax		—			—				(7,361		)		608,920			4,945				—				—				—				(2,416		)
Stock based compensation		—			—				16,650				—			—				—				—				—				16,650
Acquisition of Faiveley Transport noncontrolling interest		—			—				8,931				—			—				—				—				(751,213		)		(742,282		)
Net income		—			—				—				—			—				262,261				—				29				262,290
Translation adjustment		—			—				—				—			—				—				326,095				—				326,095
Unrealized gain on foreign exchange contracts, net of $1,763 tax		—			—				—				—			—				—				2,282				—				2,282
Unrealized gain on interest rate swap contracts, net of $1,079 tax		—			—				—				—			—				—				4,689				—				4,689
Change in pension and post-retirement benefit plans, net of $1,300 tax		—			—				—				—			—				—				1,546				—				1,546
Stock issued for Faiveley Transport Acquisition		—			—				18,445				—			6,626				—				—				—				25,071
Balance, December 31, 2017		132,349,534			$	1,323			$	906,616			(36,315,182	)		$	(827,379	)		$	2,773,301			$	(44,993	)		$	19,664			$	2,828,532

The accompanying notes are an integral part of these statements

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. BUSINESS

Wabtec is one of the world’s largest providers of value-added, technology-based equipment, systems and services for the global passenger transit and freight rail industries. Our highly engineered products, which are intended to enhance safety, improve productivity and reduce maintenance costs for customers, can be found on most locomotives, freight cars, passenger transit cars and buses around the world. Our products enhance safety, improve productivity and reduce maintenance costs for customers, and many of our core products and services are essential in the safe and efficient operation of freight rail and passenger transit vehicles. Wabtec is a global company with operations in 31 countries and our products can be found in more than 100 countries throughout the world. In 2017, about 66% of the Company’s revenues came from customers outside the U.S.

 

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation The consolidated financial statements include the accounts of the Company and all subsidiaries that it controls. For consolidated subsidiaries in which the Company's ownership is less than 100%, the outside shareholders' interests are shown as noncontrolling interests. These statements have been prepared in accordance with U.S. generally accepted accounting principles. Sales between subsidiaries are billed at prices consistent with sales to third parties and are eliminated in consolidation.

Cash Equivalents Cash equivalents are highly liquid investments purchased with an original maturity of three months or less.

Allowance for Doubtful Accounts The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The allowance for doubtful accounts was $12.3 million and $7.3 million as of December 31, 2017 and 2016, respectively.

Inventories Inventories are stated at the lower of cost or market. Cost is determined under the first-in, first-out (FIFO) method. Inventory costs include material, labor and overhead.

Property, Plant and Equipment Property, plant and equipment additions are stated at cost. Expenditures for renewals and improvements are capitalized. Expenditures for ordinary maintenance and repairs are expensed as incurred. The Company computes book depreciation principally on the straight-line method. Accelerated depreciation methods are utilized for income tax purposes.

Leasing Arrangements The Company conducts a portion of its operations from leased facilities and finances certain equipment purchases through lease agreements. In those cases in which the lease term approximates the useful life of the leased asset or the lease meets certain other prerequisites, the leasing arrangement is classified as a capital lease. The remaining arrangements are treated as operating leases.

Goodwill and Intangible Assets Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles (with definite lives) are amortized on a straight-line basis over their estimated economic lives. Amortizable intangible assets are reviewed for impairment when indicators of impairment are present. The Company tests goodwill and indefinite-lived intangible assets for impairment at the reporting unit level and at least annually. The Company performs its annual impairment test during the fourth quarter after the annual forecasting process is completed, and also tests for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Periodically, Management of the Company assesses whether or not an indicator of impairment is present that would necessitate an impairment analysis be performed.

For 2017, the Company opted to proceed directly to the two-step quantitative impairment test for all reporting units with goodwill. In the first step of the quantitative assessment, our assets and liabilities, including existing goodwill and other intangible assets, are assigned to the identified reporting units to determine the carrying value of the reporting units. The income approach and the market approach are weighted at 50% and 50%, respectively, in arriving at fair value. The discounted cash flow model requires several assumptions including future sales growth, EBIT (earnings before interest and taxes) margins and capital expenditures for the reporting units. The discounted cash flow model also requires the use of a discount rate and a terminal revenue growth rate (the revenue growth rate for the period beyond the years forecasted by the reporting units), as well as projections of future operating margins. The market approach requires several assumptions including EBITDA (earnings before interest, taxes, depreciation and amortization) multiples for comparable companies that operate in the same markets as

55

---

the Company’s reporting units. The estimated fair value of all reporting units was substantially in excess of its respective carrying value, which resulted in a conclusion that no impairment existed.

Additionally, the Company proceeded directly to the quantitative impairment test for some trade names with indefinite lives. The fair value of all trade names subject to the quantitative impairment test exceeded its respective carrying value, resulting in a conclusion that no impairment existed. For trade names not subject to the quantitative testing, the Company opted to perform a qualitative trade name impairment assessment and determined from the qualitative assessment that it was not more likely than not that the estimated fair values of the trade names were less than their carrying values; therefore, no further analysis was required. In assessing the qualitative factors to determine whether it is more likely than not that the fair value of a trade name is less than its carrying amount, we assess relevant events and circumstances that may impact the fair value and the carrying amount of the trade name. The identification of relevant events and circumstances and how these may impact a trade name’s fair value or carrying amount involve significant judgments and assumptions. The judgment and assumptions include the identification of macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, Wabtec specific events, share price trends and making the assessment on whether each relevant factor will impact the impairment test positively or negatively and the magnitude of any such impact.

Warranty Costs Warranty costs are accrued based on Management’s estimates of repair or upgrade costs per unit and historical experience. Warranty expense was $50.4 million, $28.9 million and $35.4 million for 2017, 2016 and 2015, respectively. Accrued warranty was $153.1 million and $139.0 million at December 31, 2017 and 2016, respectively.

Income Taxes Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws. The provision for income taxes includes federal, state and foreign income taxes.

Stock-Based Compensation The Company recognizes compensation expense for stock-based compensation based on the grant date fair value amortized ratably over the requisite service period following the date of grant.

Financial Derivatives and Hedging Activities The Company has entered into foreign currency forward contracts to reduce the impact of changes in currency exchange rates. Foreign currency forward contracts are agreements with a counterparty to exchange two distinct currencies at a set exchange rate for delivery on a set date at some point in the future. There is no exchange of funds until the delivery date. At the delivery date, the Company can either take delivery of the currency or settle on a net basis. For further information regarding the foreign currency forward contracts, see Footnote 17.

To reduce the impact of interest rate changes on a portion of its variable-rate debt, the Company has entered into an interest rate swap agreement with a notional value of $150 million. As of December 31, 2017, the Company has recorded a current liability of $1.2 million and a corresponding offset in accumulated other comprehensive loss of $0.7 million, net of tax, related to these agreements. For further information regarding the interest rate swap agreement, see Footnote 17.

Foreign Currency Translation Assets and liabilities of foreign subsidiaries, except for the Company’s Mexican operations whose functional currency is the U.S. Dollar, are translated at the rate of exchange in effect on the balance sheet date while income and expenses are translated at the average rates of exchange prevailing during the period. Foreign currency gains and losses resulting from transactions, and the translation of financial statements are recorded in the Company’s consolidated financial statements based upon the provisions of Accounting Standards Codification (“ASC”) 830, “Foreign Currency Matters.” The effects of currency exchange rate changes on intercompany transactions and balances of a long-term investment nature are accumulated and carried as a component of accumulated other comprehensive loss. The effects of currency exchange rate changes on intercompany transactions that are denominated in a currency other than an entity’s functional currency are charged or credited to earnings. Foreign exchange transaction losses recognized in other (expense) income, net were $6.6 million, $4.0 million and $4.7 million for 2017, 2016 and 2015, respectively.

Noncontrolling Interests In accordance with ASC 810, the Company has classified noncontrolling interests as equity on our condensed consolidated balance sheets as of December 31, 2017 and 2016. Net income attributable to noncontrolling interests was $8.5 million for the year ended December 31, 2016. Net income attributable to noncontrolling interest was not material for the years ended December 31, 2017 and 2015. Other comprehensive income attributable to noncontrolling interests for the years ended December 31, 2017, 2016 and 2015 was not material.

Revenue Recognition Revenue is recognized in accordance with ASC 605 “Revenue Recognition,”  The Company recognizes revenue when the following criteria are met: 1) persuasive evidence of an arrangement exists; 2) delivery has occurred; 3) an established sales price has been set with the customer; 4) collection of the sale revenue from the customer is reasonably assured; and 5) no contingencies exist.  Delivery is considered to have occurred when the customer assumes the risk

56

---

and rewards of ownership.  The Company estimates and records provisions for quantity rebates and sales returns and allowances as an offset to revenue in the same period the related revenue is recognized, based upon its experience.  These items are included as a reduction in deriving net sales.

In general, the Company recognizes revenues on long-term contracts based on the percentage of completion method of accounting. The units-of-delivery method or other input-based or output-based measures, as appropriate, are used to measure the progress toward completion of individual contracts. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and adjustments are reflected in the accounting period as such amounts are determined. Provisions are made currently for estimated losses on uncompleted contracts. Unbilled accounts receivables were $366.2 million and $274.9 million, customer deposits were $369.7 million and $256.6 million, and provisions for loss contracts were $94.0 million and $60.5 million at December 31, 2017 and 2016, respectively.

Certain pre-production costs relating to long-term production and supply contracts have been deferred and will be recognized over the life of the contracts. Deferred pre-production costs were $20.2 million and $29.4 million at December 31, 2017 and 2016, respectively.

Significant Customers and Concentrations of Credit Risk The Company’s trade receivables are from rail and transit industry original equipment manufacturers, Class I railroads, railroad carriers and commercial companies that utilize rail cars in their operations, such as utility and chemical companies. No one customer accounted for more than 10% of the Company’s consolidated net sales in 2017, 2016 or 2015.

Shipping and Handling Fees and Costs All fees billed to the customer for shipping and handling are classified as a component of net revenues. All costs associated with shipping and handling are classified as a component of cost of sales.

Research and Development Research and development costs are charged to expense as incurred. For the years ended December 31, 2017, 2016 and 2015, the Company incurred costs of approximately $95.2 million, $71.4 million, and $71.2 million, respectively.

Earnings Per Share Basic and diluted earnings per common share is computed in accordance with ASC 260 “Earnings Per Share.” Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and included in the computation of earnings per share pursuant to the two-class method included in ASC 260-10-55. (See Note 11 “Earnings Per Share” included herein)

Reclassifications Certain prior year amounts have been reclassified, where necessary, to conform to the current year presentation. Refer to Recently Adopted Accounting Pronouncements below.

Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from the estimates. On an ongoing basis, Management reviews its estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.                        

Recently Issued Accounting Pronouncements In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income". The amendments in this update address certain stranded income tax effects in accumulated other comprehensive income ("AOCI") resulting from the Tax Cuts and Jobs Act ("TCJA"). Current guidance requires the effect of a change in tax laws or rates on deferred tax balances to be reported in income from continuing operations in the accounting period that includes the period of enactment, even if the related income tax effects were originally charged or credited directly to AOCI. The amount of the reclassification would include the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of the enactment of TCJA related to items in AOCI. The updated guidance is effective for reporting periods beginning after December 15, 2018 and is to be applied retrospectively to each period in which the effect of the TCJA related to items remaining in AOCI are recognized or at the beginning of the period of adoption. Early adoption is permitted. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost". The amendments in this update require the service cost component of net benefit costs to be reported in the same line item or items as other compensation costs

57

---

arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented in the income statement separately from the service cost component and outside income from operations. This update also allows the service cost component to be eligible for capitalization when applicable. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption was permitted as of the beginning of an annual period. The amendments should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements.

    

In January 2017, the FASB issued ASU No. 2017-04 "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment". The amendments in this update eliminate the requirement to perform Step 2 of the goodwill impairment test. Instead, an entity should perform a goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value up to the carrying amount of the goodwill. The ASU is effective for public companies in the fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The impact of adopting this guidance could result in a change in the overall conclusion as to whether or not a reporting units' goodwill is impaired and the amount of an impairment charge recognized in the event a reporting units' carrying value exceeds its fair value. All of the Company's reporting units had fair values that were greater than the carrying value as of the Company's last quantitative goodwill impairment test, which was performed as of October 1, 2017.

In November 2016, the FASB issued ASU No. 2016-18 "Statement of Cash Flows (Topic 230): Restricted Cash". The amendments in this update require a statement of cash flows to explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements.

In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 814)" which requires lessees to recognize a right of use asset and lease liability on the balance sheet for all leases with terms longer than 12 months. For leases with terms less than 12 months, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right of use asset and lease liability. The ASU is effective for public companies in the fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contract with Customers.”  The ASU will supersede most of the existing revenue recognition requirements in U.S. GAAP and will require entities to recognize revenue at an amount that reflects the consideration to which the Company expects to be entitled in exchange for transferring goods or services to a customer.  The new standard also requires significantly expanded disclosures regarding the qualitative and quantitative information of an entity’s nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.  The Board voted to propose that the standard would take effect for reporting periods beginning after December 15, 2017 and that early adoption would be allowed as of the original effective date. The impact to results is not anticipated to be material because the analysis of the Company's current long-term contracts under the new revenue recognition standard supports the recognition of revenue over time under the cost-to-cost method for substantially all of our long-term contracts, which is consistent with our current revenue recognition model. The Company plans to adopt this accounting standard update using the modified retrospective method, with the cumulative effect of initially applying this update recognized in the first reporting period of 2018. The Company has evaluated new disclosure requirements and is implementing appropriate changes to its business processes and controls to support disclosure under the new guidance.

Recently Adopted Accounting Pronouncements In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”. The ASU simplifies several aspects for the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The ASU became effective for public companies during interim and annual reporting periods beginning after December 15, 2016. In accordance with this update, the Company began recognizing all excess tax deficiencies and tax benefits from share-based payment awards as a benefit or expense to income tax in the income statement. This update has been adopted prospectively in accordance with the ASU and the impact of adoption on the income statement was not material. Additionally, in accordance with this update, the Company

58

---

began classifying excess income tax benefits from exercise of stock options as an operating activity on the consolidated statement of cash flows. The Company elected to adopt this amendment retrospectively and the impact of the adoption on operating and financing cash flows was not material.

    

    

59

---

3. ACQUISITIONS

Faiveley Transport

On November 30, 2016, the Company acquired majority ownership of Faiveley Transport S.A. (“Faiveley Transport”)

under the terms of a Share Purchase Agreement (“Share Purchase Agreement”). Faiveley Transport is a leading global provider

of value-added, integrated systems and services for the railway industry with annual sales of about $1.2 billion and more than

5,700 employees in 24 countries. Faiveley Transport supplies railway manufacturers, operators and maintenance providers with

a range of value-added, technology-based systems and services in Energy & Comfort (air conditioning, power collectors and

converters, and passenger information), Access & Mobility (passenger access systems and platform doors), and Brakes and

Safety (braking systems and couplers). The transaction was structured as a step acquisition as follows:

•

On November 30, 2016, the Company acquired majority ownership of Faiveley Transport, after completing the purchase of the Faiveley family’s ownership interest under the terms of the Share Purchase Agreement, which directed the Company to pay €100 per share of Faiveley Transport, payable between 25% and 45% in cash at the election of those shareholders and the remainder payable in Wabtec stock. The Faiveley family’s ownership interest acquired by the Company represented approximately 51% of outstanding share capital and approximately 49% of the outstanding voting shares of Faiveley Transport. Upon completion of the share purchase under the Share Purchase Agreement, Wabtec commenced a tender offer for the remaining publicly traded Faiveley Transport shares. The public shareholders had the option to elect to receive €100 per share in cash or 1.1538 shares of Wabtec common stock per share of Faiveley Transport. The common stock portion of the consideration was subject to a cap on issuance of Wabtec common shares that was equivalent to the rates of cash and stock elected by the 51% owners.

•

On February 3, 2017, the initial cash tender offer was closed, which resulted in the Company acquiring approximately 27% of additional outstanding share capital and voting rights of Faiveley Transport for approximately $411.8 million in cash and $25.2 million in Wabtec stock. After the initial cash tender offer, the Company owned approximately 78% of outstanding share capital and 76% of voting rights.

•

On March 6, 2017, the final cash tender offer was closed, which resulted in the Company acquiring approximately 21% of additional outstanding share capital and 22% of additional outstanding voting rights of Faiveley Transport for approximately $303.2 million in cash and $0.3 million in Wabtec stock. After the final cash tender offer, the Company owned approximately 99% of the share capital and 98% of the voting rights of Faiveley Transport.

•	On March 21, 2017, a mandatory squeeze-out procedure was finalized, which resulted in the Company acquiring the Faiveley Transport shares not tendered in the offers for approximately $17.5 million in cash. This resulted in the Company owning 100% of the share capital and voting rights of Faiveley Transport.

As of November 30, 2016, the date the Company acquired 51% of the share capital and 49% of the voting interest in Faiveley Transport, Faiveley Transport was consolidated under the variable interest entity model as the Company concluded that it was the primary beneficiary of Faiveley Transport as it then possessed the power to direct the activities of Faiveley Transport that most significantly impact its economic performance and it then possessed the obligation and right to absorb losses and benefits from Faiveley Transport.

The purchase price paid for 100% ownership of Faiveley Transport was $1,507 million. The $744.7 million included as deposits in escrow on the consolidated balance sheet at December 31, 2016 was cash designated for use as consideration for the tender offers.

The fair values of the assets acquired and liabilities assumed were determined using the income, cost and market approaches. The fair value measurements were primarily based on significant inputs that are not observable in the market and are considered Level 3. The December 31, 2016 consolidated balance sheet includes the assets and liabilities of Faiveley Transport, which have been measured at fair value. The fair value of the noncontrolling interest was preliminarily determined using the market price of Faiveley Transport’s publicly traded common stock multiplied by the number of publicly traded common shares outstanding at the acquisition date and is considered Level 1. The acquisition of the noncontrolling interest during the three months ended March 31, 2017 resulted in a $8.9 million increase to additional paid-in capital on the consolidated balance sheet which represents the difference in consideration paid to acquire the noncontrolling interest and the carrying value of noncontrolling interest at acquisition.

60

---

The following table summarizes the final fair values of the Faiveley Transport assets acquired and liabilities assumed.

In thousands
Assets acquired
Cash and cash equivalents		$	178,318
Accounts receivable		439,631
Inventories		205,649
Other current assets		70,930
Property, plant, and equipment		148,746
Goodwill		1,262,350
Trade names		346,328
Customer Relationships		233,529
Patents		1,201
Other noncurrent assets		184,564
Total assets acquired		3,071,246
Liabilities assumed
Current liabilities		819,493
Debt		409,899
Other noncurrent liabilities		335,039
Total liabilities assumed		1,564,431
Net assets acquired		$	1,506,815

During the twelve months ended December 31, 2017, the estimated fair values for customer relationships and current liabilities were adjusted by $21.8 million and $65.3 million, respectively, for changes to initial estimates based on information that existed at the date of acquisition. Additionally, the estimated fair values for accounts receivable and current liabilities were adjusted by $2.8 million and $36.2 million, respectively, to correct errors in the preliminary estimated fair values of the Faiveley Transport assets acquired and liabilities assumed. Other noncurrent assets were adjusted by $30.0 million to record the deferred tax impact of these adjustments. As a result of these adjustments and other immaterial adjustments related to changes to initial estimates based on information that existed at the date of acquisition, goodwill increased by $74.1 million. Accounts receivable and current liabilities were adjusted by $64.3 million to correct an error in the preliminary estimated fair values of Faiveley Transport assets and liabilities assumed related to a factoring arrangement with recourse.

Substantially all of the accounts receivable acquired are expected to be collectible. Included in current liabilities is $25.9 million of accrued compensation for acquired share-based stock plans that are obligated to be settled in cash. Contingent liabilities assumed as part of the transaction were not material. These contingent liabilities are related to environmental, legal and tax matters. Contingent liabilities are recorded at fair value in purchase accounting, aside from those pertaining to uncertainty in income taxes which are an exception to the fair value basis of accounting.

Goodwill was calculated as the difference between the acquisition date fair value of the consideration transferred and the fair value of the net assets acquired, and represents the future economic benefits, including synergies and assembled workforce, that we expect to achieve as a result of the acquisition. Purchased goodwill is not deductible for tax purposes. The goodwill allocated to the Freight segment is $72.0 million and the goodwill allocated to the Transit segment is $1,190.4 million.

Other Acquisitions

The Company made the following acquisitions operating as a business unit or component of a business unit in the Freight Segment:

•	On December 4, 2017, the Company acquired Melett Limited ("Melett"), a leader in the design, manufacture, and supply of high-quality turbochargers and replacement parts to the turbocharger aftermarket, for a purchase price of approximately $74.0 million, net of cash acquired, resulting in preliminary goodwill of $22.5 million, none of which will be deductible for tax purposes.

•	On April 5, 2017, the Company acquired Thermal Transfer Corporation ("TTC"), a leading provider of heat

transfer solutions for industrial applications, for a purchase price of approximately $32.5 million, net of cash

acquired, resulting in preliminary goodwill of $16.3 million, all of which will be deductible for tax purposes.

61

---

•	On March 13, 2017, the Company acquired Aero Transportation Products ("ATP"), a manufacturer of engineered covering systems for hopper freight cars, for a purchase price of approximately $65.3 million, net of cash

acquired, resulting in preliminary goodwill of $29.0 million, all of which will be deductible for tax purposes.

•	On December 14, 2016, the Company acquired Workhorse Rail LLC ("Workhorse"), a supplier of engineered freight car components, mainly for the aftermarket for a purchase price of approximately $43.8 million, net of cash acquired, resulting in goodwill of $22.3 million, 38% of which will be deductible for tax purposes.

•

On November 17, 2016, the Company acquired the assets of Precision Turbo & Engine ("Precision Turbo"), a designer and manufacturer of high-performance, aftermarket turbochargers, wastegates, and heat exchangers for the automotive performance market for a purchase price of approximately $13.9 million, net of cash acquired, resulting in goodwill of $4.2 million, all of which will be deductible for tax purposes.

•	On May 5, 2016, the Company acquired the assets of Unitrac Railroad Materials ("Unitrac"), a leading designer and manufacturer of railroad products and track work services for a purchase price of approximately $14.8 million, net of cash acquired, resulting in goodwill of $2.4 million, all of which will be deductible for tax purposes.

For the Melett, TTC, and ATP acquisitions, the following table summarizes the preliminary estimated fair values of the assets acquired and liabilities assumed at the date of the acquisitions.  For the Workhorse, Precision Turbo, and Unitrac acquisitions, the following table summarizes the final fair value of assets acquired and liabilities assumed at the date of acquisition.  

		Melett				TTC				ATP				Workhorse				Precision Turbo				Unitrac
		December 4, 2017				April 5, 2017				March 13, 2017				December 14, 2016				November 17, 2016				May 5, 2016
In thousands
Current assets		$	21,068			$	3,746			$	11,666			$	9,137			$	4,145			$	11,476
Property, plant & equipment		5,917				5,909				5,354				—				1,317				1,768
Goodwill		22,501				16,309				29,034				22,273				4,248				2,442
Other intangible assets		39,259				12,300				25,000				21,500				5,200				1,230
Total assets acquired		88,745				38,264				71,054				52,910				14,910				16,916
Total liabilities assumed		(14,789		)		(5,753		)		(5,800		)		(9,083		)		(1,057		)		(2,145		)
Net assets acquired		$	73,956			$	32,511			$	65,254			$	43,827			$	13,853			$	14,771

The Company made the following acquisitions operating as a business unit or component of a business unit in the Transit Segment:

•	On October 2, 2017, the Company acquired AM General Contractor ("AM General"), a manufacturer of safety systems, mainly for transit rail cars for a purchase price of approximately $10.4 million, net of cash acquired, resulting in preliminary goodwill of $12.9 million, none of which will be deductible for tax purposes.

•	On August 1, 2016, the Company acquired Gerken Group S.A. ("Gerken"), a manufacturer of specialty carbon and graphite products for rail and other industrial applications, for a purchase price of approximately $62.8 million, net of cash acquired, resulting in goodwill of $17.5 million, none of which will be deductible for tax purposes.

 For the AM General acquisition, the following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition. For the Gerken acquisition, the following table summarizes the final fair value of the assets acquired and liabilities assumed at the date of the acquisition.

 

		AM General				Gerken
		October 2, 2017				August 1, 2016
In thousands
Current assets		$	6,611			$	32,706
Property, plant & equipment		4,140				7,667
Goodwill		12,943				17,470
Other intangible assets		12,097				30,560
Other assets		—				1,706
Total assets acquired		35,791				90,109
Total liabilities assumed		(25,375		)		(27,262		)
Net assets acquired		$	10,416			$	62,847

62

---

The acquisitions listed above include escrow deposits of $44.4 million, which may be released to the Company for indemnity and other claims in accordance with the purchase and escrow agreements.

 

The total goodwill and other intangible assets for acquisitions listed in the tables above was $2,117.8 million, of which $1,389.6 million and $728.2 million was related to goodwill and other intangible assets, respectively.  Of the allocation of $728.2 million of acquired intangible assets, $380.9 million was assigned to trade names, $336.9 million was assigned to customer relationships, and $5.0 million was assigned to intellectual property. The trade names are considered to have an indefinite useful life while the intellectual property and customer relationships’ useful life is 20 years.

The Company also made smaller acquisitions not listed above which are individually and collectively immaterial.

The following unaudited pro forma financial information presents income statement results as if the acquisitions listed above had occurred January 1, 2016:

 

		For the year ended December 31,
In thousands		2017				2016
Net sales		$	3,946,244			$	4,212,617
Gross profit		1,095,101				1,275,835
Net income attributable to Wabtec shareholders		271,783				349,852
Diluted earnings per share
As Reported		$	2.72			$	3.34
Pro forma		$	2.82			$	3.83

 

The historical consolidated financial information of the Company and the acquisitions detailed above have been adjusted in the pro forma information to give effect to pro forma events that are (1) directly attributable to the transactions, (2) factually supportable and (3) expected to have a continuing impact on the combined results. Pro forma data may not be indicative of the results that would have been obtained had these acquisitions occurred at the beginning of the periods presented, nor is it intended to be a projection of future results.

4. SUPPLEMENTAL CASH FLOW DISCLOSURES

		Year Ended December 31,
		2017				2016				2015
In thousands
Interest paid during the year		$	75,317			$	30,211			$	19,372
Income taxes paid during the year, net of amount refunded		$	89,379			$	121,563			$	147,958
Business acquisitions:
Fair value of assets acquired		452,209				3,118,420				156,020
Liabilities assumed		207,788				1,453,382				20,789
Non-controlling interest (acquired) assumed		(738,024		)		760,343				—
Stock and cash paid		982,445				904,695				135,231
Less: Cash acquired		35,408				186,903				5,681
Stock used for acquisition		25,500				534,679				—
Net cash paid		$	921,537			$	183,113			$	129,550

  

5. INVENTORIES

The components of inventory, net of reserves, were:

 

		December 31,
In thousands		2017				2016
Raw materials		$	378,481			$	331,465
Work-in-progress		167,390				145,462
Finished goods		196,763				181,583
Total inventories		$	742,634			$	658,510

63

---

6. PROPERTY, PLANT & EQUIPMENT

The major classes of depreciable assets are as follows:

		December 31,
In thousands		2017				2016
Machinery and equipment		$	728,257			$	645,354
Buildings and improvements		259,561				225,307
Land and improvements		38,228				41,569
Property, plant and equipment		1,026,046				912,230
Less: accumulated depreciation		(452,074		)		(393,854		)
Total		$	573,972			$	518,376

 

The estimated useful lives of property, plant and equipment are as follows:

	Years
Land improvements	10 to 20
Building and improvements	20 to 40
Machinery and equipment	3 to 15

 

Depreciation expense was $66.7 million, $47.1 million, and $43.1 million for 2017, 2016 and 2015, respectively.

 

7. INTANGIBLES

Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles with definite lives are amortized on a straight-line basis over their estimated economic lives. Goodwill and indefinite lived intangible assets are reviewed annually during the fourth quarter for impairment (See Note 2 “Summary of Significant Accounting Policies” included herein). Goodwill and indefinite live intangible assets were not impaired at December 31, 2017 and 2016.

The change in the carrying amount of goodwill by segment for the year ended December 31, 2017 is as follows:

		Freight				Transit
In thousands		Segment				Segment				Total
Balance at December 31, 2016		$	550,902			$	1,527,863			$	2,078,765
Additions		152,096				34,391				186,487
Foreign currency impact		15,960				178,891				194,851
Balance at December 31, 2017		$	718,958			$	1,741,145			$	2,460,103

As of December 31, 2017 and 2016, the Company’s trade names had a net carrying amount of $603.4 million and $510.5 million, respectively, and the Company believes these intangibles have indefinite lives. Intangible assets of the Company, other than goodwill and trade names, consist of the following:

		December 31,
In thousands		2017				2016
Patents, non-compete and other intangibles, net of accumulated
amortization of $43,021 and $40,638		$	17,554			$	15,360
Customer relationships, net of accumulated amortization
of $126,824 and $87,334		583,459				528,068
Total		$	601,013			$	543,428

The remaining weighted average useful lives of patents, customer relationships and intellectual property were 10 years, 17 years and 15 years respectively. Amortization expense for intangible assets was $36.5 million, $22.7 million, and $21.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Estimated amortization expense for the five succeeding years is as follows (in thousands):

2018	$	38,059
2019	36,076
2020	34,050
2021	33,777
2022	33,489

 

64

---

8. LONG-TERM DEBT

Long-term debt consisted of the following:

		December 31,
In thousands		2017				2016
3.45% Senior Notes due 2026, net of unamortized debt issuance costs of $2,345 and $2,526		$	747,655			$	747,474
4.375% Senior Notes due 2023, net of unamortized discount and debt issuance costs of $1,433 and $1,690		248,567				248,310
Revolving Credit Facility and Term Loan, net of unamortized debt issuance costs of $2,451 and $3,850		853,124				796,150
Schuldschein Loan		11,998				98,671
Other Borrowings		6,860				1,153
Capital Leases		2,324				1,018
Total		1,870,528				1,892,776
Less - current portion		47,225				129,809
Long-term portion		$	1,823,303			$	1,762,967

 

Wabtec's acquisition of the controlling stake of Faiveley Transport triggered the early repayment of a syndicated loan and the mandatory offer to investors to repay the US and Schuldschein private placements. Both the syndicated loan and US private placements were repaid in full in December 2016.

3.45% Senior Notes Due November 2026

In October 2016, the Company issued $750.0 million of Senior Notes due in 2026 (the “2016 Notes”).  The 2016 Notes were issued at 99.965% of face value.  Interest on the 2016 Notes accrues at a rate of 3.45% per annum and is payable semi-annually on May 15 and November 15 of each year.  The proceeds were used to finance the cash portion of the Faiveley Transport acquisition, refinance Faiveley Transport’s indebtedness, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.7 million of deferred financing costs related to the issuance of the 2016 Notes.  

The 2016 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2016 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens.

The Company is in compliance with the restrictions and covenants in the indenture under which the 2016 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities.

4.375% Senior Notes Due August 2023

In August 2013, the Company issued $250.0 million of Senior Notes due in 2023 (the “2013 Notes”).  The 2013 Notes were issued at 99.879% of face value.  Interest on the 2013 Notes accrues at a rate of 4.375% per annum and is payable semi-annually on February 15 and August 15 of each year.  The proceeds were used to repay debt outstanding under the Company’s existing credit agreement, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.6 million of deferred financing costs related to the issuance of the 2013 Notes.  

The 2013 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2013 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens.

The Company is in compliance with the restrictions and covenants in the indenture under which the 2013 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities.

2016 Refinancing Credit Agreement

65

---

On June 22, 2016, the Company amended its existing revolving credit facility with a consortium of commercial banks. This “2016 Refinancing Credit Agreement” provides the Company with a $1.2 billion, 5 year revolving credit facility and a $400.0 million delayed draw term loan (the “Term Loan”). The Company incurred approximately $3.3 million of deferred financing cost related to the 2016 Refinancing Credit Agreement. The facility expires on June 22, 2021. The 2016 Refinancing Credit Agreement borrowings bear variable interest rates indexed as described below. At December 31, 2017, the Company had available bank borrowing capacity, net of $35.4 million of letters of credit, of approximately $679.0 million, subject to certain financial covenant restrictions.

The Term Loan was drawn on November 25, 2016. The Company incurred a 10 basis point commitment fee from June 22, 2016 until the initial draw on November 25, 2016.

Under the 2016 Refinancing Credit Agreement, the Company may elect a Base Rate of interest for U.S. Dollar denominated loans or, for certain currencies, an interest rate based on the London Interbank Offered Rate (“LIBOR”) of interest, or other rates appropriate for such currencies (in any case, “the Alternate Rate”). The Base Rate adjusts on a daily basis and is the greater of the Federal Funds Effective Rate plus 0.50% per annum, the PNC, N.A. prime rate or the Daily LIBOR Rate plus 100 basis points, plus a margin that ranges from 0 to 75 basis points. The Alternate Rate is based on the quoted rates specific to the applicable currency, plus a margin that ranges from 75 to 175 basis points. Both the Base Rate and Alternate Rate margins are dependent on the Company’s consolidated total indebtedness to EBITDA ratios. The initial Base Rate margin is 0 basis points and the Alternate Rate margin is 175 basis points.

At December 31, 2017, the weighted average interest rate on the Company’s variable rate debt was 2.92%.  On January 12, 2012, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million. The effective date of the interest rate swap agreement is July 31, 2013, and the termination date was November 7, 2016. The impact of the interest rate swap agreement converted a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing. During the term of the interest rate swap agreement the interest rate on the notional value was fixed at 1.415% plus the Alternate Rate margin. On June 5, 2014, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million.  The effective date of the interest rate swap agreement is November 7, 2016, and the termination date is December 19, 2018.  The impact of the interest rate swap agreement converts a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing.  During the term of the interest rate swap agreement the interest rate on the notional value will be fixed at 2.56% plus the Alternate Rate margin.  As for these agreements, the Company is exposed to credit risk in the event of nonperformance by the counterparties.  However, since only the cash interest payments are exchanged, exposure is significantly less than the notional amount.  The counterparties are large financial institutions with excellent credit ratings and history of performance.  The Company currently believes the risk of nonperformance is negligible.

The 2016 Refinancing Credit Agreement limits the Company’s ability to declare or pay cash dividends and prohibits the Company from declaring or making other distributions, subject to certain exceptions. The 2016 Refinancing Credit Agreement contains various other covenants and restrictions including the following limitations: incurrence of additional indebtedness; mergers, consolidations, sales of assets and acquisitions; additional liens; sale and leasebacks; permissible investments, loans and advances; certain debt payments; and imposes a minimum interest expense coverage ratio of 3.0 and a maximum debt to EBITDA ratio of 3.25. The Company is in compliance with the restrictions and covenants of the 2016 Refinancing Credit Agreement and does not expect that these measurements will limit the Company in executing our operating activities.

Schuldschein Loan, Due 2016

In conjunction with the acquisition of Faiveley Transport, Wabtec acquired $137.2 million of a Schuldshein private placement loan which was originally issued by Faiveley Transport on March 5, 2014 in Germany, in which approximately 20 international investors participated. This loan is denominated in euros. Subsequent to the acquisition of Faiveley Transport, the Company repaid $125.3 million of the outstanding Schuldschein loan. The remaining balance of $12.0 million as of December 31, 2017 matures on March 5, 2024 and bears a fixed rate of 4.00%.

66

---

Debt and Capital Leases

Scheduled principal repayments of debt and capital lease balances as of December 31, 2017 are as follows:
2018	$	47,225
2019	330,901
2020	559
2021	483,379
2022	208
Future years	1,008,256
Total	$	1,870,528

67

---

9. EMPLOYEE BENEFIT PLANS

Defined Benefit Pension Plans

The Company sponsors defined benefit pension plans that cover certain U.S., Canadian, German, and United Kingdom employees and which provide benefits of stated amounts for each year of service of the employee. The Company uses a December 31 measurement date for the plans.

The following tables provide information regarding the Company’s defined benefit pension plans summarized by U.S. and international components.

Obligations and Funded Status

		U.S.								International
In thousands		2017				2016				2017				2016
Change in projected benefit obligation
Obligation at beginning of year		$	(45,512	)		$	(46,120	)		$	(319,551	)		$	(195,311	)
Opening balance sheet adjustment		—				—				(5,321		)		—
Service cost		(344		)		(337		)		(2,740		)		(1,379		)
Interest cost		(1,422		)		(1,475		)		(7,310		)		(5,774		)
Employee contributions		—				—				(880		)		(195		)
Plan curtailments and amendments		—				—				4,153				2,061
Benefits paid		3,079				3,893				12,906				9,427
Acquisition		—				—				—				(114,242		)
Actuarial gain (loss)		(14		)		(1,473		)		(3,009		)		(33,330		)
Effect of currency rate changes		—				—				(31,265		)		19,192
Obligation at end of year		$	(44,213	)		$	(45,512	)		$	(353,017	)		$	(319,551	)
Change in plan assets
Fair value of plan assets at beginning of year		$	35,802			$	37,640			$	241,283			$	168,069
Opening balance sheet adjustment		—				—				2,058				—
Actual return on plan assets		4,223				2,055				19,102				20,066
Employer contributions		486				—				13,479				6,933
Employee contributions		—				—				880				195
Benefits paid		(3,079		)		(3,893		)		(12,905		)		(9,427		)
Acquisition		—				—				—				70,519
Settlements										(4,523		)
Effect of currency rate changes		—				—				22,228				(15,072		)
Fair value of plan assets at end of year		$	37,432			$	35,802			$	281,602			$	241,283
Funded status
Fair value of plan assets		$	37,432			$	35,802			$	281,602			$	241,283
Benefit obligations		(44,213		)		(45,512		)		(353,017		)		(319,551		)
Funded status		$	(6,781	)		$	(9,710	)		$	(71,415	)		$	(78,268	)
Amounts recognized in the statement of financial position consist of:
Noncurrent assets		$	—			$	—			$	10,577			$	7,130
Current liabilities		—				—				(2,158		)		(2,042		)
Noncurrent liabilities		(6,781		)		(9,710		)		(79,834		)		(83,356		)
Net amount recognized		$	(6,781	)		$	(9,710	)		$	(71,415	)		$	(78,268	)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Prior service cost		(6		)		(8		)		(32		)		(56		)
Net actuarial loss		(20,418		)		(23,884		)		(54,043		)		(56,411		)
Net amount recognized		$	(20,424	)		$	(23,892	)		$	(54,075	)		$	(56,467	)

68

---

 The aggregate accumulated benefit obligation for the U.S. pension plans was $43.3 million and $44.5 million as of December 31, 2017 and 2016, respectively. The aggregate accumulated benefit obligation for the international pension plans was $344.3 million and $312.2 million as of December 31, 2017 and 2016, respectively.

		U.S.								International
In thousands		2017				2016				2017				2016
Information for pension plans with accumulated benefit obligations in
excess of Plan assets:
Projected benefit obligation		$	(44,213	)		$	(45,512	)		$	(282,077	)		$	(255,682	)
Accumulated benefit obligation		(43,340		)		(44,530		)		(274,557		)		(249,729		)
Fair value of plan assets		37,432				35,802				200,218				170,367
Information for pension plans with projected benefit obligations in
excess of plan assets:
Projected benefit obligation		$	(44,213	)		$	(45,512	)		$	(283,106	)		$	(256,530	)
Fair value of plan assets		37,432				35,802				201,115				171,133

 

Components of Net Periodic Benefit Costs

		U.S.												International
In thousands		2017				2016				2015				2017				2016				2015
Service cost		$	344			$	337			$	381			$	2,740			$	1,379			$	2,015
Interest cost		1,422				1,475				1,914				7,310				5,774				7,091
Expected return on plan assets		(1,731		)		(2,076		)		(2,168		)		(12,412		)		(9,971		)		(9,591		)
Amortization of initial net obligation and prior service cost		3				3				3				27				61				212
Amortization of net loss		989				914				1,062				2,846				1,818				2,379
Settlement and curtailment losses recognized		—				—				—				768				218				—
Net periodic benefit cost		$	1,027			$	653			$	1,192			$	1,279			$	(721	)		$	2,106

 

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows:

In thousands		U.S.				International
Net gain (loss) arising during the year		$	2,477			$	3,683
Effect of exchange rates		—				(4,945		)
Amortization, settlement, or curtailment recognition of net transition obligation		—				768
Amortization or curtailment recognition of prior service cost		3				27
Amortization or settlement recognition of net loss		989				2,846
Total recognized in other comprehensive gain		$	3,469			$	2,379
Total recognized in net periodic benefit cost and other comprehensive gain		$	2,442			$	1,100

The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed.

		U.S.									International
		2017			2016			2015			2017			2016			2015
Discount rate		3.56	%		3.95	%		4.21	%		2.40	%		2.51	%		3.56	%
Expected return on plan assets		4.95	%		5.70	%		5.70	%		5.02	%		6.07	%		5.81	%
Rate of compensation increase		3.00	%		3.00	%		3.00	%		2.54	%		2.54	%		3.10	%

The discount rate is based on settling the pension obligation with high grade, high yield corporate bonds, and the rate of compensation increase is based on actual experience. The expected return on plan assets is based on historical performance as well as expected future rates of return on plan assets considering the current investment portfolio mix and the long-term investment strategy.

69

---

As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018.

In thousands		U.S.				International
Prior service cost		3				22
Net actuarial loss		970				2,193
		$	973			$	2,215

 Pension Plan Assets

The Company has established formal investment policies for the assets associated with our pension plans. Objectives include maximizing long-term return at acceptable risk levels and diversifying among asset classes. Asset allocation targets are based on periodic asset liability study results which help determine the appropriate investment strategies. The investment policies permit variances from the targets within certain parameters. The plan assets consist primarily of equity security funds, debt security funds, and temporary cash and cash equivalent investments. The assets held in these funds are generally actively managed and are valued at the net asset value per share multiplied by the number of shares held as of the measurement date. (See Note 18 “Fair Value Measurement” included herein). Plan assets by asset category at December 31, 2017 and 2016 are as follows:

		U.S.								International
In thousands		2017				2016				2017				2016
Pension Plan Assets
Equity security funds		$	18,122			$	17,446			$	100,453			$	92,201
Debt security funds and other		18,304				17,038				178,730				145,003
Cash and cash equivalents		1,006				1,318				2,419				4,079
Fair value of plan assets		$	37,432			$	35,802			$	281,602			$	241,283

The U.S. plan has a target asset allocation of 55% equity securities and 45% debt securities. The International plan has a target asset allocation of 30% equity securities, 40% debt securities and 30% in other investments. Investment policies are determined by the respective Plan’s Pension Committee and set forth in its Investment Policy. Rebalancing of the asset allocation occurs on a quarterly basis.

The following tables summarize our pension plan assets measured at fair value on a recurring basis by fair value hierarchy level (See Note 18):

		December 31, 2017
In thousands		NAV				Level 1				Level 2				Level 3				Total
US:
Equity		$	—			$	18,122			$	—			$	—			$	18,122
Debt Securities		—				4,273				14,031				—				18,304
Cash and cash equivalents		—				1,006				—				—				1,006
International:
Equity		$	4,586			$	38,647			$	95,641			$	—			$	138,874
Debt Securities		—				—				111,204				—				111,204
Insurance Contracts		—				—				15,893				13,123				29,016
Cash and cash equivalents		—				2,507				—				—				2,507
Total		$	4,586			$	64,555			$	236,769			$	13,123			$	319,033

70

---

		December 31, 2016
In thousands		NAV				Level 1				Level 2				Level 3				Total
US:
Equity		$	—			$	17,446			$	—			$	—			$	17,446
Debt Securities		—				4,766				12,272				—				17,038
Cash and cash equivalents		—				1,318				—				—				1,318
International:
Equity		$	3,589			$	38,053			$	78,694			$	—			$	120,336
Debt Securities		—				—				90,508				—				90,508
Insurance Contracts		—				—				13,037				12,996				26,033
Cash and cash equivalents		—				4,406				—				—				4,406
Total		$	3,589			$	65,989			$	194,511			$	12,996			$	277,085

The following table presents a reconciliation of Level 3 assets:

In thousands		Total
Balance at December 31, 2015		$	—
Net purchases, issuances, and settlements		56
Net realized and unrealized gains (losses) included in earnings		(5		)
Business acquisition		12,949
Other		(4		)
Balance at December 31, 2016		$	12,996
Net purchases, issuances, and settlements		778
Net realized and unrealized gains (losses) included in earnings		375
Opening balance sheet adjustment		(1,308		)
Other		282
Balance at December 31, 2017		$	13,123

 

Cash Flows

The Company’s funding methods are based on governmental requirements and differ from those methods used to recognize pension expense. The Company expects to contribute $7.3 million and $0.0 million to the international and U.S. plans, respectively, during 2018.

Benefit payments expected to be paid to plan participants are as follows:

In thousands		U.S.				International
Year ended December 31,
2018		$	3,250			$	12,401
2019		3,301				12,403
2020		3,325				13,156
2021		3,160				13,799
2022		3,125				14,538
2023 through 2027		14,276				77,817

Postretirement Benefit Plans

In addition to providing pension benefits, the Company has provided certain unfunded postretirement health care and life insurance benefits for a portion of North American employees. The Company is not obligated to pay health care and life insurance benefits to individuals who had retired prior to 1990.

71

---

The Company uses a December 31 measurement date for all postretirement plans. The following tables provide information regarding the Company’s post retirement benefit plans summarized by U.S. and international components.

Obligations and Funded Status

		U.S.								International
In thousands		2017				2016				2017				2016
Change in projected benefit obligation
Obligation at beginning of year		$	(11,876	)		$	(12,959	)		$	(3,425	)		$	(3,290	)
Service cost		(5		)		(4		)		(28		)		(29		)
Interest cost		(350		)		(389		)		(98		)		(99		)
Plan amendments		—				6				—				—
Benefits paid		970				720				199				133
Acquisition		—				(143		)		—				—
Actuarial gain (loss)		(84		)		893				(131		)		(42		)
Effect of currency rate changes		—				—				(237		)		(98		)
Obligation at end of year		$	(11,345	)		$	(11,876	)		$	(3,720	)		$	(3,425	)
Change in plan assets
Fair value of plan assets at beginning of year		$	—			$	—			$	—			$	—
Employer contributions		970				720				199				133
Benefits paid		(970		)		(720		)		(199		)		(133		)
Fair value of plan assets at end of year		$	—			$	—			$	—			$	—
Funded status
Fair value of plan assets		$	—			$	—			$	—			$	—
Benefit obligations		(11,345		)		(11,876		)		(3,720		)		(3,425		)
Funded status		$	(11,345	)		$	(11,876	)		$	(3,720	)		$	(3,425	)
		U.S.								International
In thousands		2017				2016				2017				2016
Amounts recognized in the statement of financial position consist of:
Current liabilities		$	(1,046	)		$	(1,084	)		$	(208	)		$	(185	)
Noncurrent liabilities		(10,299		)		(10,792		)		(3,512		)		(3,160		)
Net amount recognized		$	(11,345	)		$	(11,876	)		$	(3,720	)		$	(3,345	)
Amounts recognized in accumulated other comprehensive income (loss)
consist of:
Prior service credit		19,616				21,134				9				15
Net actuarial (loss) gain		(18,882		)		(20,023		)		154				292
Net amount recognized		$	734			$	1,111			$	163			$	307

Components of Net Periodic Benefit Cost

		U.S.												International
In thousands		2017				2016				2015				2017				2016				2015
Service cost		$	5			$	4			$	9			$	28			$	29			$	38
Interest cost		350				389				1,233				98				99				128
Amortization of initial net obligation and prior service cost		(1,519		)		(1,709		)		(2,295		)		(7		)		(7		)		(7		)
Amortization of net loss (gain)		1,225				1,287				1,356				(23		)		(29		)		(30		)
Net periodic benefit cost (credit)		$	61			$	(29	)		$	303			$	96			$	92			$	129

 

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows:

In thousands		U.S.				International
Net loss arising during the year		(84		)		(131		)
Effect of exchange rates		—				16
Amortization or curtailment recognition of prior service cost		(1,519		)		(7		)
Amortization or settlement recognition of net loss (gain)		1,225				(23		)
Total recognized in other comprehensive income (loss)		$	(378	)		$	(145	)
Total recognized in net periodic benefit cost and other comprehensive income (loss)		$	(317	)		$	(53	)

72

---

The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed and also the net periodic benefit cost for the following year. The discount rate is based on settling the pension obligation with high grade, high yield corporate bonds.

		U.S.									International
		2017			2016			2015			2017			2016			2015
Discount rate		3.43	%		3.76	%		3.95	%		3.21	%		3.46	%		3.80	%

As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018.

In thousands		U.S.				International
Prior service credit		(1,519		)		(7		)
Net actuarial loss (gain)		1,216				(8		)
		$	(303	)		$	(15	)

The assumed health care cost trend rate for the U.S. plans grades from an initial rate of 6.30% to an ultimate rate of 4.50% by 2027 and for international plans from 6.23% to 4.50% by 2027. A 1.0% increase in the assumed health care cost trend rate will increase the service and interest cost components of the expense recognized for the U.S. and international post-retirement plans by less than $0.1 million for 2017, and increase the accumulated post-retirement benefit obligation by less than $0.1 million and $0.3 million, respectively. A 1.0% decrease in the assumed health care cost trend rate will decrease the service and interest cost components of the expense recognized for the U.S. and international post-retirement plans by less than $0.1 million for 2017, and decrease the accumulated post-retirement benefit obligation by less than $0.1 million and $0.3 million, respectively.

Cash Flows

Benefit payments expected to be paid to plan participants are as follows:

In thousands		U.S.				International
Year ended December 31,
2018		$	1,046			$	208
2019		1,024				220
2020		986				225
2021		950				245
2022		908				251
2023 through 2027		3,956				1,352

Defined Contribution Plans

The Company also participates in certain defined contribution plans and multiemployer pension plans. Costs recognized under these plans are summarized as follows:

		For the year ended December 31,
In thousands		2017				2016				2015
Multi-employer pension and health & welfare plans		$	1,522			$	2,054			$	2,584
401(k) savings and other defined contribution plans		23,209				23,062				21,399
Total		$	24,731			$	25,116			$	23,983

The 401(k) savings plan is a participant directed defined contribution plan that holds shares of the Company’s stock as one of the investment options. At December 31, 2017 and 2016, the plan held on behalf of its participants about 495,274 shares with a market value of $40.3 million, and 551,482 shares with a market value of $45.8 million, respectively.

Additionally, the Company has stock option based benefit and other plans further described in Note 12.

The Company contributes to several multi-employer defined benefit pension plans under collective bargaining agreements that cover certain of its union-represented employees. The risks of participating in such plans are different from the risks of single-employer plans. Assets contributed to a multi-employer plan by one employer may be used to provide benefits to employees of other participating employers. If a participating employer ceases to contribute to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. If the Company ceases to have an obligation to

73

---

contribute to the multi-employer plan in which it had been a contributing employer, it may be required to pay to the plan an amount based on the underfunded status of the plan and on the history of the Company’s participation in the plan prior to the cessation of its obligation to contribute. The amount that an employer that has ceased to have an obligation to contribute to a multi-employer plan is required to pay to the plan is referred to as a withdrawal liability.

The Company’s participation in multi-employer plans for the year ended December 31, 2017 is outlined in the table below. For plans that are not individually significant to the Company, the total amount of contributions is presented in the aggregate.

					Pension Protection Act Zone Status (b)				FIP/		Contributions by the Company																						Expiration Dates of
									RP Status Pending/																						Surcharge Imposed		Collective Bargaining
Pension Fund		EIN/PN (a)			2016		2015		Implemented (c)		2017						2016							2015							(d)		Agreements
Idaho Operating Engineers-		EIN #	91-6075538		Green		Green		No		$	1,020			(1)		$	1,306			(1	)		$	1,820			(1	)		No		6/30/2018
Employers Pension Trust Fund		Plan#	001
Automobile Mechanics' Local No 701 Union and		EIN #	36-6042061		Yellow		Red		Yes (2)		$	501			(3)		$	748						$	764						No (4)		6/1/2018
Industry Pension Plan		Plan #	001
									Total Contributions		$	1,521					$	2,054						$	2,584

 

(1)	The Company’s contribution represents more than 5% of the total contributions to the plan.

(2)	The Pension Fund’s board adopted a Funding Improvement Plan on October 21, 2015, continuing the existing plan which increased the weekly pension fund contribution rates by $75 with corresponding decreases to the weekly welfare fund contribution rates until December 31, 2017.

(3)	The number of employees covered by this fund decreased due to the closure of the Bensenville, Illinois facility, which affected the period-to-period comparability of 2016 and 2017 contributions.

(4)	Critical status triggered a 5% surcharge on employer contributions effective June 2012.  Effective January 1, 2013, this surcharge increases to 10%. The surcharge ended on October 21, 2015 when the rehabilitation plan commenced.

(a)	The “EIN / PN” column provides the Employer Identification Number and the three-digit plan number assigned to a plan by the Internal Revenue Service.

(b)

The most recent Pension Protection Act Zone Status available for 2017 and 2016 is for plan years that ended in 2016 and 2015, respectively. The zone status is based on information provided to the Company and other participating employers by each plan and is certified by the plan’s actuary. A plan in the “red” zone has been determined to be in “critical status”, based on criteria established under the Internal Revenue Code (“Code”), and is generally less than 65% funded. A plan in the “yellow” zone has been determined to be in “endangered status”, based on criteria established under the Code, and is generally less than 80% funded. A plan in the “green” zone has been determined to be neither in “critical status” nor in “endangered status”, and is generally at least 80% funded.

(c)	The “FIP/RP Status Pending/Implemented” column indicates whether a Funding Improvement Plan, as required under the Code to be adopted by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” zone, is pending or has been implemented as of the end of the plan year that ended in 2017.

(d)	The “Surcharge Imposed” column indicates whether the Company’s contribution rate for 2017 included an amount in addition the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical status”, in accordance with the requirements of the Code.

10. INCOME TAXES

The Company is responsible for filing consolidated U.S., foreign and combined, unitary or separate state income tax returns. The Company is responsible for paying the taxes relating to such returns, including any subsequent adjustments resulting from the redetermination of such tax liabilities by the applicable taxing authorities.

On December 23, 2017, the French government enacted the Finance Act for 2018 and it was published in the Official Bulletin on December 31, 2017. The Finance act reduced the French corporate tax rate from 28% in 2020 to 25%, enacting an additional 1.5% reduction in each year 2021 and 2022.

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). The Tax Act makes broad and complex changes to the U.S. tax code that affect fiscal 2017, including, but not limited to requiring a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries that is payable over eight years (the "Transition Tax"). The Tax Act also establishes new tax laws that will affect 2018 and later years, including, but not limited to, a reduction of the U.S. federal corporate tax rate from 35% to 21%, repeals the Domestic Manufacturing Deduction, a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries, new provisions designed to tax global intangible low-taxed income ("GILTI"), tax certain deductible base erosion payments called base erosion and anti-abuse tax (“BEAT”), and new interest expense limitation provisions.

74

---

In relation to the initial analysis of the impact of the all tax law changes, the Company has recorded a net tax expense of $4.3 million. This includes a provisional expense for the U.S. tax reform bill of $55.0 million, as well as a net benefit for the revaluation of deferred tax assets and liabilities of $50.7 million.

The Company has not completed its accounting for the income tax effects of the Tax Act. Where the Company has been able to make reasonable estimates of the effects for which its analysis is not yet complete, the Company has recorded provisional amounts in accordance with SEC Staff Accounting Bulletin No. 118. Where the Company has not yet been able to make reasonable estimates of the impact of certain elements, the Company has not recorded any amounts related to those elements and has continued accounting for them in accordance with ASC 740 on the basis of the tax laws in effect immediately prior to the enactment of the Tax Act.

The Company's accounting for the following impacted areas of the Tax Act is incomplete. However, the Company was able to make reasonable estimates of certain effects and, therefore, has recorded provisional amounts as follows:

Revaluation of deferred tax assets and liabilities:    The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017. In addition, the Tax Act makes certain changes to the depreciation rules and implements new limits on the deductibility of certain executive compensation. The Company has evaluated these changes and has recorded a provisional benefit to net deferred taxes of $24.6 million. The Company is still completing its calculation of the impact of these changes on its deferred tax balances.

Transition Tax on unrepatriated foreign earnings:    The Transition Tax on unrepatriated foreign earnings is a tax on previously untaxed accumulated and current earnings and profits ("E&P") of the Company's foreign subsidiaries. To determine the amount of the Transition Tax, the Company must determine, among other factors, the amount of post-1986 E&P of its foreign subsidiaries, as well as the amount of non-U.S. income taxes paid on such earnings. The Company was able to make a reasonable estimate of the Transition Tax and has recorded a provisional Transition Tax expense of $51.8 million. The Company is continuing to gather additional information to more precisely compute the amount of the Transition Tax to complete its calculation of E&P as well as the final determination of non-U.S. income taxes paid.

The Company's accounting for the following elements of the Tax Act is incomplete, and it has not yet been able to make reasonable estimates of the effects of these items. Therefore, no provisional amounts were recorded.

Global intangible low taxed income ("GILTI"):    The Tax Act creates a new requirement that certain income (i.e., GILTI) earned by foreign subsidiaries must be included currently in the gross income of the U.S. shareholder. Due to the complexity of the new GILTI tax rules, the Company is continuing to evaluate this provision of the Tax Act and the application of ASC 740. Under U.S. GAAP, the Company is permitted to make an accounting policy election to either treat taxes due on future inclusions in U.S. taxable income related to GILTI as a current-period expense when incurred or to factor such amounts into the Company's measurement of its deferred taxes. The Company has not yet completed its analysis of the GILTI tax rules and is not yet able to reasonably estimate the effect of this provision of the Tax Act or make an accounting policy election for the ASC 740 treatment of the GILTI tax. Therefore, the Company has not recorded any amounts related to potential GILTI tax in its financial statements and has not yet made a policy decision regarding whether to record deferred taxes on GILTI.

Indefinite reinvestment assertion: Beginning in 2018, the Tax Act provides a 100% deduction for dividends received from 10-percent owned foreign corporations by U.S. corporate shareholders, subject to a one-year holding period. Although dividend income is now exempt from U.S. federal tax in the hands of the U.S. corporate shareholders, companies must still apply the guidance of ASC 740 to account for the tax consequences of outside basis differences and other tax impacts of their investments in non-U.S. subsidiaries. While the Company has accrued the Transition Tax on the deemed repatriated earnings that were previously indefinitely reinvested, the Company was unable to determine a reasonable estimate of the remaining tax liability, if any, under the Tax Act for its remaining outside basis differences or evaluate how the Tax Act will affect the Company's existing accounting position to indefinitely reinvest unremitted foreign earnings. Therefore, the Company has not included a provisional amount for this item in its financial statements for fiscal 2017. The Company will record amounts as needed for this item beginning in the first reporting period during the measurement period in which the Company obtains necessary information and is able to analyze and prepare a reasonable estimate.

The components of the income from operations before provision for income taxes for the Company’s domestic and foreign operations for the years ended December 31 are provided below:

		For the year ended December 31,
In thousands		2017				2016				2015
Domestic		$	140,325			$	276,218			$	461,394
Foreign		211,738				136,619				123,974
Income from operations before income taxes		$	352,063			$	412,837			$	585,368

75

---

The consolidated provision for income taxes included in the Statement of Income consisted of the following:

		For the year ended December 31,
In thousands		2017				2016				2015
Current taxes
Federal		$	86,157			$	72,317			$	141,245
State		3,644				9,953				16,072
Foreign		67,395				27,391				24,442
		157,196				109,661				181,759
Deferred taxes
Federal		(22,863		)		11,013				9,606
State		(1,024		)		1,953				770
Foreign		(43,536		)		(23,194		)		(5,395		)
		(67,423		)		(10,228		)		4,981
Total provision		$	89,773			$	99,433			$	186,740

A reconciliation of the United States federal statutory income tax rate to the effective income tax rate on operations for the years ended December 31 is provided below:

		For the year ended December 31,
In thousands		2017			2016			2015
U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State taxes		0.4	%		2.1	%		2.0	%
Tax reserves		—	%		(0.2	)%		(0.4	)%
Foreign		(8.3	)%		(4.3	)%		(2.1	)%
Research and development credit		(0.8	)%		(1.0	)%		(0.4	)%
Manufacturing deduction		(1.1	)%		(1.8	)%		(2.3	)%
France tax rate change		(6.5	)%		(6.5	)%		—	%
U.S. tax rate change		(7.9	)%		—	%		—	%
U.S. tax reform provision		15.6	%		—	%		—	%
Transaction costs related to acquisitions		—	%		1.5	%		—	%
Other, net		(0.9	)%		(0.7	)%		0.1	%
Effective rate		25.5	%		24.1	%		31.9	%

    

The 6.5% decrease in the effective tax rate due to the France tax rate change was the result of adopted tax legislation that reduces the corporate income tax rate in France from 28.0% to 25.0% over the period 2021 to 2022. The 7.9% decrease in the effective tax rate due to the U.S. tax rate change was the result of adopted tax legislation that reduces the corporate income tax rate in the U.S. from 35.0% to 21.0% effective January 1, 2018. The 15.6% increase in the effective tax rate due to the U.S. tax reform previously discussed. Deferred income taxes result from temporary differences in the recognition of income and expense for financial and income tax reporting purposes. These deferred income taxes will be recognized as future tax benefits or costs when the temporary differences reverse.

76

---

Components of deferred tax assets and liabilities were as follows:

		December 31,
In thousands		2017				2016
Deferred income tax assets:
Accrued expenses and reserves		$	10,961			$	26,117
Warranty reserve		20,211				24,131
Deferred compensation/employee benefits		18,353				25,755
Pension and postretirement obligations		21,637				25,595
Inventory		19,620				22,579
Net operating loss carry forwards		65,671				59,416
Tax credit carry forwards		1,921				621
Other		13,053				2,317
Gross deferred income tax assets		171,427				186,531
Valuation allowance		25,683				21,418
Total deferred income tax assets		145,744				165,113
Deferred income tax liabilities:
Property, plant & equipment		37,015				47,321
Intangibles		288,141				359,312
Total deferred income tax liabilities		325,156				406,633
Net deferred income tax liability		$	(179,412	)		$	(241,520	)

A valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized.  As of December 31, 2017, the valuation allowance for certain foreign carryforwards was $25.7 million primarily in Brazil, China, United Kingdom, and South Africa.

Net operating loss carry-forwards in the amount of $65.7 million expire in various periods from December 31, 2018 to December 31, 2037.

As of December 31, 2017, the liability for income taxes associated with unrecognized tax benefits was $6.9 million, of which $4.4 million, if recognized, would favorably affect the Company’s effective income tax rate. As of December 31, 2016, the liability for income taxes associated with unrecognized tax benefits was $8.4 million, of which $4.2 million, if recognized, would favorably affect the Company’s effective tax rate. A reconciliation of the beginning and ending amount of the liability for income taxes associated with unrecognized tax benefits follows:

In thousands		2017				2016				2015
Gross liability for unrecognized tax benefits at beginning of year		$	8,423			$	10,557			$	12,596
Gross increases - unrecognized tax benefits in prior periods		2,466				6				—
Gross increases - current period unrecognized tax benefits		—				—				1,682
Gross decreases - unrecognized tax benefits in prior periods		—				—				—
Gross decreases - audit settlement during year		(3,979		)		—				(3,027		)
Gross decreases - expiration of audit statute of limitations		—				(2,140		)		(694		)
Gross liability for unrecognized tax benefits at end of year		$	6,910			$	8,423			$	10,557

The Company includes interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2017, the total interest and penalties accrued was approximately $0.7 million and $0.1 million, respectively. As of December 31, 2016, the total interest and penalties accrued was approximately $0.8 million and $0.3 million, respectively.

With limited exception, the Company is no longer subject to examination by various U.S. and foreign taxing authorities for years before 2012. At this time, the Company believes that it is reasonably possible that unrecognized tax benefits of approximately $5.2 million may change within the next 12 months due to the expiration of statutory review periods and current examinations.

 

77

---

11. EARNINGS PER SHARE

The computation of earnings per share from operations is as follows:

		For the Year Ended December 31,
In thousands, except per share data		2017				2016				2015
Numerator
Numerator for basic and diluted earnings per common share - net income attributable
to Wabtec shareholders		$	262,261			$	304,887			$	398,628
Less: dividends declared - common shares and non-vested restricted stock		(42,218		)		(32,430		)		(26,963		)
Undistributed earnings		220,043				272,457				371,665
Percentage allocated to common shareholders (1)		99.7		%		99.7		%		99.7		%
		219,383				271,640				370,550
Add: dividends declared - common shares		42,092				32,333				26,875
Numerator for basic and diluted earnings per common share		$	261,475			$	303,973			$	397,425
Denominator
Denominator for basic earnings per common share - weighted average shares		95,453				90,359				96,074
Effect of dilutive securities:
Assumed conversion of dilutive stock-based compensation plans		672				782				932
Denominator for diluted earnings per common share - adjusted weighted average
shares and assumed conversion		96,125				91,141				97,006
Net income per common share attributable to Wabtec shareholders
Basic		$	2.74			$	3.37			$	4.14
Diluted		$	2.72			$	3.34			$	4.10
(1) Basic weighted-average common shares outstanding		95,453				90,359				96,074
Basic weighted-average common shares outstanding and non-vested restricted
stock expected to vest		95,740				90,627				96,388
Percentage allocated to common shareholders		99.7		%		99.7		%		99.7		%

Options to purchase approximately 24,000, 20,000, and 13,000 shares of Common Stock were outstanding in 2017, 2016 and 2015, respectively, but were not included in the computation of diluted earnings because their impact would have been antidilutive.

12. STOCK-BASED COMPENSATION PLANS

As of December 31, 2017, the Company maintains employee stock-based compensation plans for stock options, restricted stock, and incentive stock units as governed by the 2011 Stock Incentive Compensation Plan, as amended and restated (the “2011 Plan”) and the 2000 Stock Incentive Plan, as amended (the “2000 Plan”).  The 2011 Plan has a term through May 10, 2027 and as of December 31, 2017 the number of shares available for future grants under the 2011 Plan was 3,192,453 shares, which includes remaining shares to grant under the 2000 Plan.  The amendment and restatement of the 2011 Plan was approved by stockholders of Wabtec on May 10, 2017. The Company also maintains a 1995 Non-Employee Directors’ Fee and Stock Option Plan as amended and restated (“the Directors Plan”).  The amendment and restatement of the Directors Plan was approved by stockholders of Wabtec on May 10, 2017. The Directors Plan, as amended, authorizes a total of 1,000,000 shares of Common Stock to be issued. Under the Directors Plan options issued become exercisable over a three-year vesting period and expire ten years from the date of grant and restricted stock issued under the plan vests one year from the date of grant. As compensation for directors’ fees for the years ended December 31, 2017, 2016 and 2015, the Company issued a total of 16,500, 16,972 and 11,256 shares of restricted stock to non-employee directors. The total number of shares issued under the plan as of December 31, 2017 was 881,192 shares. 

Stock-based compensation expense for all of the plans was $21.3 million, $20.8 million and $26.0 million for the years ended December 31, 2017, 2016 and 2015, respectively. The Company recognized associated tax benefits related to the stock-based compensation plans of $8.9 million, $14.9 million and $15.3 million for the respective periods. Included in the stock-based compensation expense for 2017 above is $1.7 million of expense related to stock options, $7.0 million related to non-vested restricted stock, $4.6 million related to restricted stock units, $6.5 million related to incentive stock units and $1.5 million related to units issued for Directors’ fees. At December 31, 2017, unamortized compensation expense related to those stock options, non-vested restricted shares and incentive stock units expected to vest totaled $24.6 million and will be recognized over a weighted average period of 1.2 years.

 

78

---

Stock Options Stock options are granted to eligible employees and directors at the fair market value, which is the average of the high and low Wabtec stock price on the date of grant. Under the 2011 Plan and the 2000 Plan, options become exercisable over a four year vesting period and expire 10 years from the date of grant.  

The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and Directors Plan for the years ended December 31: 

		Options			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life		Aggregate Intrinsic value (in thousands)
Outstanding at December 31, 2014		1,147,558			$	28.33			5.5		$	67,205
Granted		84,675			87.35						1,375
Exercised		(124,156	)		26.70						(5,516		)
Canceled		(10,754	)		65.22						(64		)
Outstanding at December 31, 2015		1,097,323			$	32.70			4.8		$	42,154
Granted		94,115			61.39						2,035
Exercised		(83,790	)		25.58						(4,813		)
Canceled		(8,825	)		71.47						(102		)
Outstanding at December 31, 2016		1,098,823			$	35.39			4.3		$	52,332
Granted		65,522			86.91						—
Exercised		(166,838	)		21.37						(10,020		)
Canceled		(13,995	)		76.89						(64		)
Outstanding at December 31, 2017		983,512			$	40.62			4.0		$	40,137
Exercisable at December 31, 2017		802,609			$	32.52			3.3		$	36,848

Options outstanding at December 31, 2017 were as follows: 

		Number of Options			Weighted Average Exercise Price of Options				Weighted Average Remaining Contractual		Number of Options Currently			Weighted Average Exercise Price of Options Currently
Range of exercise prices		Outstanding			Outstanding				Life		Exercisable			Exercisable
Under $15.00		180,000			$	14.50			1.1		180,000			$	14.50
15.00 - 23.00		193,701			18.77				1.3		193,701			18.77
23.00 - 30.00		136,924			28.75				2.8		136,924			28.75
30.00 - 38.00		94,496			35.24				4.1		94,496			35.24
Over 38.00		378,391			69.86				7.0		197,488			63.72
		983,512			$	40.62					802,609			$	32.52

 

 

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: 

		For the year ended December 31,
		2017				2016				2015
Dividend yield		0.23		%		0.26		%		0.14		%
Risk-free interest rate		2.2		%		1.5		%		1.8		%
Stock price volatility		23.4		%		26.9		%		27.3		%
Expected life (years)		5.0				5.0				5.0
Weighted average fair value of options granted during the year		$	20.69			$	14.96			$	24.41

The dividend yield is based on the Company’s dividend rate and the current market price of the underlying common stock at the date of grant. Expected life in years is determined from historical stock option exercise data. Expected volatility is based on the historical volatility of the Company’s stock. The risk-free interest rate is based on the 7 years U.S. Treasury bond rates for the expected life of the option.

Restricted Stock and Incentive Stock  Beginning in 2006 the Company adopted a restricted stock program. As provided for under the 2011 and 2000 Plans, eligible employees are granted restricted stock that generally vests over four years from the date of grant. Under the Directors Plan, restricted stock units vest one year from the date of grant.

79

---

In addition, the Company has issued incentive stock units to eligible employees that vest upon attainment of certain cumulative three-year performance goals. Based on the Company’s performance for each three year period then ended, the incentive stock units can vest and be awarded ranging from 0% to 200% of the initial incentive stock units granted. The incentive stock units included in the table below represent the number of shares that are expected to vest based on the Company’s estimate for meeting those established performance targets. As of December 31, 2017, the Company estimates that it will achieve 84%, 77% and 91% for the incentive stock units expected to vest based on performance for the three year periods ending December 31, 2017, 2018, and 2019, respectively, and has recorded incentive compensation expense accordingly. If our estimate of the number of these stock units expected to vest changes in a future accounting period, cumulative compensation expense could increase or decrease and will be recognized in the current period for the elapsed portion of the vesting period and would change future expense for the remaining vesting period.

Compensation expense for the non-vested restricted stock and incentive stock units is based on the closing price of the Company’s common stock on the date of grant and recognized over the applicable vesting period.

The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the years ended December 31: 

		Restricted Stock and Units			Incentive Stock Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014		438,543			791,608			$	47.97
Granted		113,945			126,050			87.90
Vested		(182,776	)		(433,932	)		37.76
Adjustment for incentive stock awards expected to vest		—			65,666			57.57
Canceled		(12,827	)		(7,754	)		67.05
Outstanding at December 31, 2015		356,885			541,638			$	65.89
Granted		212,600			167,850			66.03
Vested		(159,975	)		(236,591	)		51.80
Adjustment for incentive stock awards expected to vest		—			(38,164	)		74.42
Canceled		(13,215	)		(9,983	)		71.84
Outstanding at December 31, 2016		396,295			424,750			$	72.18
Granted		153,516			157,025			86.66
Vested		(137,088	)		(153,271	)		70.34
Adjustment for incentive stock awards expected to vest		—			(87,592	)		73.69
Canceled		(13,723	)		(13,579	)		76.61
Outstanding at December 31, 2017		399,000			327,333			$	78.76

 

 

13. OTHER COMPREHENSIVE LOSS

The components of accumulated other comprehensive loss were:

		December 31,
In thousands		2017				2016
Foreign currency translation gain (loss)		$	5,063			$	(321,033	)
Unrealized gain (loss) on interest rate swap contracts, net of tax of $1,338 and $1,540		4,015				(2,957		)
Unrealized loss on pension and post-retirement benefit plans, net of tax of $19,532 and $20,832		(54,070		)		(55,615		)
Total accumulated other comprehensive loss		$	(44,992	)		$	(379,605	)

 

80

---

The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2017 are as follows:

 

		Foreign currency				Derivative				Pension and post retirement
In thousands		translation				contracts				benefits plans				Total
Balance at December 31, 2016		$	(321,033	)		$	(2,957	)		$	(55,615	)		$	(379,605	)
Other comprehensive income before reclassifications		326,096				6,712				(1,017		)		331,791
Amounts reclassified from accumulated other
comprehensive income		—				260				2,562				2,822
Net current period other comprehensive income		326,096				6,972				1,545				334,613
Balance at December 31, 2017		$	5,063			$	4,015			$	(54,070	)		$	(44,992	)

Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2017 are as follows: 

		Amount reclassified from accumulated other				Affected line item in the Condensed Consolidated
In thousands		comprehensive income				Statements of Income
Amortization of defined pension and post retirement items
Amortization of initial net obligation and prior service cost		$	(1,496	)		Cost of sales
Amortization of net loss (gain)		5,037				Cost of sales
		3,541				Income from Operations
		(979		)		Income tax expense
		$	2,562			Net income
Derivative contracts
Realized loss on derivative contracts		400				Interest expense, net
		(140		)		Income tax expense
		$	260			Net income

The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2016 are as follows:

		Foreign currency				Derivative				Pension and post retirement
In thousands		translation				contracts				benefits plans				Total
Balance at December 31, 2015		$	(227,349	)		$	(2,987	)		$	(46,383	)		$	(276,719	)
Other comprehensive income before reclassifications		(93,684		)		(1,286		)		(10,874		)		(105,844		)
Amounts reclassified from accumulated other
comprehensive income		—				1,316				1,642				2,958
Net current period other comprehensive income		(93,684		)		30				(9,232		)		(102,886		)
Balance at December 31, 2016		$	(321,033	)		$	(2,957	)		$	(55,615	)		$	(379,605	)

Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2016 are as follows: 

		Amount reclassified from accumulated other				Affected line item in the Condensed Consolidated
In thousands		comprehensive income				Statements of Income
Amortization of defined pension and post retirement items
Amortization of initial net obligation and prior service cost		$	(1,652	)		Cost of sales
Amortization of net loss (gain)		3,989				Cost of sales
		2,337				Income from Operations
		(695		)		Income tax expense
		$	1,642			Net income
Derivative contracts
Realized loss on derivative contracts		1,873				Interest expense, net
		(557		)		Income tax expense
		$	1,316			Net income

 

81

---

14. OPERATING LEASES

The Company leases office and manufacturing facilities under operating leases with terms ranging from one to 15 years, excluding renewal options.

Total net rental expense charged to operations in 2017, 2016, and 2015 was $34.6 million, $27.2 million and $20.2 million, respectively. The amounts above are shown net of sublease rentals which were immaterial for the years 2017, 2016 and 2015, respectively.

 Future minimum rental payments under operating leases with remaining non-cancelable terms in excess of one year are as follows:

		Real
In thousands		Estate				Equipment				Total
2018		$	28,957			$	2,690			$	31,647
2019		25,857				1,925				27,782
2020		24,266				976				25,242
2021		19,561				512				20,073
2022		16,350				271				16,621
2023 and after		66,017				24				66,041

 

15. WARRANTIES

The following table reconciles the changes in the Company’s product warranty reserve as follows:

In thousands		2017				2016
Balance at beginning of year		$	138,992			$	92,064
Warranty expense		50,385				28,947
Acquisitions		806				59,685
Warranty claim payments		(48,548		)		(38,772		)
Foreign currency impact		11,428				(2,932		)
Balance at end of year		$	153,063			$	138,992

 

16. PREFERRED STOCK

The Company’s authorized capital stock includes 1,000,000 shares of preferred stock. The Board of Directors has the authority to issue the preferred stock and to fix the designations, powers, preferences and rights of the shares of each such class or series, including dividend rates, conversion rights, voting rights, terms of redemption and liquidation preferences, without any further vote or action by the Company’s shareholders. The rights and preferences of the preferred stock would be superior to those of the common stock. At December 31, 2017 and 2016 there was no preferred stock issued or outstanding.

82

---

17. DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING

Foreign Currency Hedging The Company uses forward contracts to mitigate its foreign currency exchange rate exposure due to forecasted sales of finished goods and future settlement of foreign currency denominated assets and liabilities. Derivatives used to hedge forecasted transactions and specific cash flows associated with foreign currency denominated financial assets and liabilities that meet the criteria for hedge accounting are designated as cash flow hedges. The effective portion of gains and losses is deferred as a component of accumulated other comprehensive income and is recognized in earnings at the time the hedged item affects earnings, in the same line item as the underlying hedged item. The contracts are scheduled to mature within two years. For the twelve months ended December 31, 2017, the amount reclassified into income was $0.4 million.

Other Activities The Company enters into certain derivative contracts in accordance with its risk management strategy that do not meet the criteria for hedge accounting but which have the impact of largely mitigating foreign currency exposure. These foreign exchange contracts are accounted for on a full mark to market basis through earnings, with gains and losses recorded as a component of other expense, net. The net unrealized gain related to these contracts was $2.1 million for the twelve months ended December 31, 2017. The notional amount and fair value of foreign exchange contracts that did not meet the criteria for hedge accounting at December 31, 2017 was not material. These contracts are scheduled to mature within one year.

The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedged discussed in the above sections:

In millions		Designated				Non-Designated				Total
Gross notional amount		$	805.1			$	379.7			$	1,184.8
Fair Value:
Other current assets		3.5				2.1				5.6
Other current liabilities		—				—				—
Total		$	3.5			$	2.1			$	5.6

Interest Rate Hedging The Company uses interest rate swaps to manage interest rate exposures. The Company is exposed to interest rate volatility with regard to existing floating rate debt. Primary exposure includes the London Interbank Offered Rates (LIBOR). Derivatives used to hedge risk associated with changes in the fair value of certain variable-rate debt are primarily designated as fair value hedges. Consequently, changes in the fair value of these derivatives, along with changes in the fair value of debt obligations are recognized in current period earnings. See long-term debt footnote fair value measurement footnote for further information on current interest rate swaps.

As of December 31, 2017, the Company has recorded a current liability of $1.2 million and an accumulated other comprehensive loss of $0.7 million, net of tax, related to these agreements.

83

---

18. FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS

ASC 820 “Fair Value Measurements and Disclosures” defines fair value, establishes a framework for measuring fair value and explains the related disclosure requirements. ASC 820 indicates, among other things, that a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model.

Valuation Hierarchy. ASC 820 establishes a valuation hierarchy for disclosure of the inputs to valuation used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2017, which are included in other current liabilities on the Consolidated Balance sheet: 

						Fair Value Measurements at December 31, 2017 Using
		Total Carrying Value at December 31,				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs				Significant Unobservable Inputs
In thousands		2017				(Level 1)				(Level 2)				(Level 3)
Interest rate swap agreements		1,163				—				1,163				—
Total		$	1,163			$	—			$	1,163			$	—

The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2016, which are included in other current liabilities on the Consolidated Balance sheet: 

						Fair Value Measurements at December 31, 2016 Using
		Total Carrying Value at December 31,				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs				Significant Unobservable Inputs
In thousands		2016				(Level 1)				(Level 2)				(Level 3)
Interest rate swap agreements		3,888				—				3,888				—
Total		$	3,888			$	—			$	3,888			$	—

 

To reduce the impact of interest rate changes on a portion of its variable-rate debt, the Company entered into interest rate swaps which effectively converted a portion of the debt from variable to fixed-rate borrowings during the term of the swap contracts. For certain derivative contracts whose fair values are based upon trades in liquid markets, such as interest rate swaps, valuation model inputs can generally be verified and valuation techniques do not involve significant management judgment. The fair values of such financial instruments are generally classified within Level 2 of the fair value hierarchy.

As a result of our global operating activities the Company is exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, the Company minimizes these risks through entering into foreign currency forward contracts. The foreign currency forward contracts are valued using broker quotations, or market transactions in either the listed or over-the counter markets. As such, these derivative instruments are classified within level 2.

The Company’s cash and cash equivalents are highly liquid investments purchased with an original maturity of three months or less and are considered Level 1 on the fair value valuation hierarchy. The fair value of cash and cash equivalents approximated the carrying value at December 31, 2017 and December 31, 2016. The Company’s defined benefit pension plan assets consist primarily of equity security funds, debt security funds and temporary cash and cash equivalent investments. These investments are comprised of a number of investment funds that invest in a diverse portfolio of assets including equity securities, corporate and governmental bonds, and money markets.  Trusts are valued at the net asset value (“NAV”) as determined by their custodian.  NAV represents the accumulation of the unadjusted quoted close prices on the reporting date for the underlying investments divided by the total shares outstanding at the reporting dates.  The 2013 and 2016 Notes are considered Level 2 based on the fair value valuation hierarchy.

84

---

The estimated fair values and related carrying values of the Company’s financial instruments are as follows:

		December 31, 2017								December 31, 2016
		Carry				Fair				Carry				Fair
In thousands		Value				Value				Value				Value
Interest rate swap agreements		$	1,163			$	1,163			$	3,888			$	3,888
4.375% Senior Notes		248,567				262,033				248,310				260,265
3.45% Senior Notes		747,655				741,113				747,474				719,273

 

The fair value of the Company’s interest rate swap agreements and the 2013 and 2016 Notes were based on dealer quotes and represent the estimated amount the Company would pay to the counterparty to terminate the agreement.

 

19. COMMITMENTS AND CONTINGENCIES

The Company is subject to a variety of environmental laws and regulations governing discharges to air and water, the handling, storage and disposal of hazardous or solid waste materials and the remediation of contamination associated with releases of hazardous substances. The Company believes its operations currently comply in all material respects with all of the various environmental laws and regulations applicable to our business; however, there can be no assurance that environmental requirements will not change in the future or that we will not incur significant costs to comply with such requirements.

Under terms of the purchase agreement and related documents for the 1990 Acquisition, American Standard, Inc., now known as Trane (“Trane”), has indemnified the Company for certain items including, among other things, certain environmental claims the Company asserted prior to 2000. If Trane was unable to honor or meet these indemnifications, the Company would be responsible for such items. In the opinion of Management, Trane currently has the ability to meet its indemnification obligations.

Claims have been filed against the Company and certain of its affiliates in various jurisdictions across the United States by persons alleging bodily injury as a result of exposure to asbestos-containing products. Most of these claims have been made against our wholly owned subsidiary, Railroad Friction Products Corporation (“RFPC”), and are based on a product sold by RFPC prior to the time that the Company acquired any interest in RFPC.

85

---

Most of these claims, including all of the RFPC claims, are submitted to insurance carriers for defense and indemnity or to non-affiliated companies that retain the liabilities for the asbestos-containing products at issue. We cannot, however, assure that all these claims will be fully covered by insurance or that the indemnitors or insurers will remain financially viable. Our ultimate legal and financial liability with respect to these claims, as is the case with other pending litigation, cannot be estimated.

It is management’s belief that the potential range of loss for asbestos-related bodily injury cases is not reasonably determinable at present due to a variety of factors, including: (1) the asbestos case settlement history of the Company’s wholly owned subsidiary, RFPC; (2) the unpredictable nature of personal injury litigation in general; and (3) the uncertainty of asbestos litigation in particular. Despite this uncertainty, and although the results of the Company’s operations and cash flows for any given period could be adversely affected by asbestos-related lawsuits, Management believes that the final resolution of the Company’s asbestos-related cases will not be material to the Company’s overall financial position, results of operations and cash flows. In general, this belief is based upon: (1) Wabtec’s and RFPC’s history of settlements and dismissals of asbestos-related cases to date; (2) the inability of many plaintiffs to establish any exposure or causal relationship to RFPC’s product; and (3) the inability of many plaintiffs to demonstrate any identifiable injury or compensable loss.

More specifically, as to RFPC, management’s belief that any losses due to asbestos-related cases would not be material is also based on the fact that RFPC owns insurance which provides coverage for asbestos-related bodily injury claims. To date, RFPC’s insurers have provided RFPC with defense and indemnity in these actions. The overall number of new claims being filed against RFPC has dropped significantly in recent years; however, these new claims, and all previously filed claims, may take a significant period of time to resolve. As to Wabtec and its divisions, Management’s belief that asbestos-related cases will not have a material impact is also based on its position that it has no legal liability for asbestos-related bodily injury claims, and that the former owners of Wabtec’s assets retained asbestos liabilities for the products at issue. To date, Wabtec has been able to successfully defend itself on this basis, including two arbitration decisions and a judicial opinion, all of which confirmed Wabtec’s position that it did not assume any asbestos liabilities from the former owners of certain Wabtec assets. Although Wabtec has incurred defense and administrative costs in connection with asbestos bodily injury actions, these costs have not been material, and the Company has no information that would suggest these costs would become material in the foreseeable future.

On April 21, 2016, Siemens Industry, Inc. filed a lawsuit against the Company in federal district court in Delaware alleging that the Company has infringed seven patents owned by Siemens, all of which relate to Positive Train Control technology. On November 2, 2016, Siemens amended its complaint to add six additional patents they also claim are infringed by the Company’s Positive Train Control Products. The Company has filed Answers, and asserted counterclaims, in response to Siemens’ complaints. The case is still in the preliminary stages, but the Company has begun filing for Inter-Parties Review proceedings before the U.S. Patent & Trademark Office seeking to invalidate the Siemens patents. Wabtec believes the claims are without merit and is vigorously defending itself.

Xorail, Inc., a wholly owned subsidiary of the Company (“Xorail”), has received notices from Denver Transit Constructors (“Denver Transit”) alleging breach of contract related to the operating of constant warning wireless crossings, and late delivery of the Train Management & Dispatch System (“TMDS”) for the Denver Eagle P3 Project, which is owned by the Denver Regional Transit District ("RTD"). No damages have been asserted for the alleged late delivery of the TMDS, and Xorail is in the final stages of successfully implementing a recovery plan concerning the TMDS issues. With regard to the wireless crossings, as of September 8, 2017, Denver Transit alleged that total damages were $36.8 million through July 31, 2017, and are continuing to accumulate. The crossings have not been certified for use without flaggers, which Denver Transit alleges is due to Xorail's failure to achieve constant warning times satisfactory to the Federal Railway Administration ("FRA") and the Public Utility Commission ("PUC"). No claims have been filed by Denver Transit with regard to either issue. Xorail has denied Denver Transit’s assertions regarding the wireless crossings, and Denver Transit has also notified RTD that Denver Transit considers the new certification requirements imposed by FRA and/or PUC as a change in law, for which neither Denver Transit nor its subcontractors are liable. Xorail has worked with Denver Transit to modify its system to meet the FRA’s and PUC's previously undefined, and evolving, certification requirements. On September 28, 2017, the FRA granted a 5 year approval of the modified wireless crossing system as currently implemented; however, the PUC has not granted approval of the modified system and therefore the crossings are still not certified for use without flaggers. Denver Transit and RTD are continuing to seek approval from PUC. The Company does not believe that it has any liability with respect to the wireless crossing issue.

From time to time the Company is involved in litigation relating to claims arising out of its operations in the ordinary course of business. As of the date hereof, the Company is involved in no litigation that the Company believes will have a material adverse effect on its financial condition, results of operations or liquidity.

20. SEGMENT INFORMATION

Wabtec has two reportable segments—the Freight Segment and the Transit Segment. The key factors used to identify these reportable segments are the organization and alignment of the Company’s internal operations, the nature of the products and services, and customer type. The business segments are:

86

---

Freight Segment primarily manufactures and services components for new and existing freight cars and locomotives, builds new switcher locomotives, rebuilds freight locomotives, supplies railway electronics, positive train control equipment, signal design and engineering services, and provides related heat exchange and cooling systems. Customers include large, publicly traded railroads, leasing companies, manufacturers of original equipment such as locomotives and freight cars, and utilities.

Transit Segment primarily manufactures and services components for new and existing passenger transit vehicles, typically regional trains, high speed trains, subway cars, light-rail vehicles and buses, builds new commuter locomotives, refurbishes subway cars, provides heating, ventilation, and air conditioning equipment, and doors for buses and subways. Customers include public transit authorities and municipalities, leasing companies, and manufacturers of subway cars and buses around the world.

The Company evaluates its business segments’ operating results based on income from operations. Intersegment sales are accounted for at prices that are generally established by reference to similar transactions with unaffiliated customers. Corporate activities include general corporate expenses, elimination of intersegment transactions, interest income and expense and other unallocated charges. Since certain administrative and other operating expenses and other items have not been allocated to business segments, the results in the following tables are not necessarily a measure computed in accordance with generally accepted accounting principles and may not be comparable to other companies. 

87

---

Segment financial information for 2017 is as follows:
										Corporate
		Freight				Transit				Activities and
In thousands		Segment				Segment				Elimination				Total
Sales to external customers		$	1,396,588			$	2,485,168			$	—			$	3,881,756
Intersegment sales/(elimination)		37,630				21,548				(59,178		)		—
Total sales		$	1,434,218			$	2,506,716			$	(59,178	)		$	3,881,756
Income (loss) from operations		$	264,603			$	188,546			$	(31,416	)		$	421,733
Interest expense and other, net		—				—				(69,670		)		(69,670		)
Income (loss) from operations before income taxes		$	264,603			$	188,546			$	(101,086	)		$	352,063
Depreciation and amortization		$	43,721			$	57,441			$	2,086			$	103,248
Capital expenditures		33,921				50,762				4,783				89,466
Segment assets		3,504,289				7,562,122				(4,486,431		)		6,579,980
Segment financial information for 2016 is as follows:
										Corporate
		Freight				Transit				Activities and
In thousands		Segment				Segment				Elimination				Total
Sales to external customers		$	1,543,098			$	1,388,090			$	—			$	2,931,188
Intersegment sales/(elimination)		39,519				9,393				(48,912		)		$	—
Total sales		$	1,582,617			$	1,397,483			$	(48,912	)		$	2,931,188
Income (loss) from operations		$	344,455			$	171,446			$	(57,540	)		$	458,361
Interest expense and other, net		—				—				(45,524		)		(45,524		)
Income (loss) from operations before income taxes		$	344,455			$	171,446			$	(103,064	)		$	412,837
Depreciation and amortization		$	36,519			$	31,545			$	1,731			$	69,795
Capital expenditures		22,726				20,987				6,503				50,216
Segment assets		2,949,668				6,720,302				(3,088,952		)		6,581,018

Segment financial information for 2015 is as follows:
										Corporate
		Freight				Transit				Activities and
In thousands		Segment				Segment				Elimination				Total
Sales to external customers		$	2,054,715			$	1,235,283			$	—			$	3,307,998
Intersegment sales/(elimination)		35,372				10,895				(46,267		)		—
Total sales		$	2,090,087			$	1,264,178			$	(46,267	)		$	3,307,998
Income (loss) from operations		$	482,640			$	150,988			$	(26,061	)		$	607,567
Interest expense and other, net		—				—				(22,199		)		(22,199		)
Income (loss) from operations before income taxes		$	482,640			$	150,988			$	(48,260	)		$	585,368
Depreciation and amortization		$	36,834			$	26,196			$	1,704			$	64,734
Capital expenditures		24,715				22,996				1,717				49,428
Segment assets		2,708,724				2,202,614				(1,681,825		)		3,229,513

 

88

---

The following geographic area data as of and for the years ended December 31, 2017, 2016 and 2015, respectively, includes net sales based on product shipment destination and long-lived assets, which consist of plant, property and equipment, net of depreciation, resident in their respective countries:

		Net Sales												Long-Lived Assets
In thousands		2017				2016				2015				2017				2016				2015
United States		$	1,323,781			$	1,362,255			$	1,754,924			$	211,608			$	205,895			$	171,362
United Kingdom		356,493				322,563				368,505				57,668				54,215				63,694
Canada		279,013				206,258				204,674				5,822				5,156				4,876
France		237,454				66,287				45,565				57,849				33,636				7,194
Germany		208,817				98,364				92,422				71,709				57,902				31,642
China		178,137				106,357				100,586				36,388				42,672				12,256
Mexico		160,029				183,583				190,034				9,117				8,766				8,839
Italy		142,037				45,771				38,164				30,329				27,253				15,170
India		137,837				24,161				12,345				12,519				1,271				1,946
Australia		136,127				82,099				86,809				10,483				8,039				8,424
Brazil		69,378				51,493				84,595				13,184				13,227				9,318
Other international		652,653				381,997				329,375				57,296				60,344				18,472
Total		$	3,881,756			$	2,931,188			$	3,307,998			$	573,972			$	518,376			$	353,193

 

Export sales from the Company’s United States operations were $448.0 million, $470.5 million and $508.4 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Sales by product are as follows:

In thousands		2017				2016				2015
Specialty Products & Electronics		$	1,350,727			$	1,374,580			$	1,733,881
Brake Products		749,959				588,081				627,552
Remanufacturing, Overhaul & Build		522,275				559,284				606,624
Transit Products		1,112,340				276,124				189,581
Other		146,455				133,119				150,360
Total sales		$	3,881,756			$	2,931,188			$	3,307,998

89

---

21. GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

The obligations under the Company's 2016 Notes, 2013 Notes and Revolving Credit Facility and Term Loan are fully and unconditionally guaranteed by all U.S. subsidiaries as guarantors. Each guarantor is 100% owned by the parent company. In accordance with positions established by the Securities and Exchange Commission, the following shows separate financial information with respect to the parent, the guarantor subsidiaries and the non-guarantor subsidiaries. The principal elimination entries eliminate investment in subsidiaries and certain intercompany balances and transactions.

Balance Sheet for December 31, 2017:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Cash and cash equivalents	$	933			$	4,802			$	227,666			$	—			$	233,401
Receivables, net	77,046				237,360				852,381				—				1,166,787
Inventories	120,937				137,972				483,725				—				742,634
Current assets - other	1,142				4,507				116,642				—				122,291
Total current assets	200,058				384,641				1,680,414				—				2,265,113
Property, plant and equipment	52,532				136,382				385,058				—				573,972
Goodwill	25,274				546,527				1,888,302				—				2,460,103
Investment in subsidiaries	6,517,205				2,570,391				—				(9,087,596		)		—
Other intangibles, net	30,575				251,347				922,510				—				1,204,432
Other long term assets	17,414				295				58,651				—				76,360
Total assets	$	6,843,058			$	3,889,583			$	4,934,935			$	(9,087,596	)		$	6,579,980
Current liabilities	$	196,827			217,176				$	1,159,327			—				$	1,573,330
Inter-company	2,121,546				(2,026,634		)		(94,912		)		—				—
Long-term debt	1,661,771				14				161,518				—				1,823,303
Long-term liabilities - other	54,046				67,824				232,945				—				354,815
Total liabilities	4,034,190				(1,741,620		)		1,458,878				—				3,751,448
Shareholders' equity	2,808,868				5,632,665				3,454,931				(9,087,596		)		2,808,868
Non-controlling interest	—				(1,462		)		21,126				—				19,664
Total shareholders' equity	$	2,808,868			$	5,631,203			$	3,476,057			$	(9,087,596	)		$	2,828,532
Total Liabilities and Shareholders' Equity	$	6,843,058			$	3,889,583			$	4,934,935			$	(9,087,596	)		$	6,579,980

90

---

Balance Sheet for December 31, 2016:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Cash and cash equivalents	$	2,522			$	9,496			$	386,466			$	—			$	398,484
Receivables, net	79,041				202,779				660,688				—				942,508
Inventories	120,042				128,076				410,392				—				658,510
Current assets - other	52,576				(17,844		)		833,397				—				868,129
Total current assets	254,181				322,507				2,290,943				—				2,867,631
Property, plant and equipment	49,031				126,661				342,684				—				518,376
Goodwill	25,275				477,472				1,576,018				—				2,078,765
Investment in subsidiaries	5,388,613				1,325,150				—				(6,713,763		)		—
Other intangibles, net	31,897				204,512				817,451				—				1,053,860
Other long term assets	9,592				(1,914		)		54,708				—				62,386
Total assets	$	5,758,589			$	2,454,388			$	5,081,804			$	(6,713,763	)		$	6,581,018
Current liabilities	$	194,983			196,956				$	1,054,700			—				$	1,446,639
Inter-company	1,562,399				(1,848,777		)		286,378				—				—
Long-term debt	1,761,933				58				976				—				1,762,967
Long-term liabilities - other	33,298				74,977				286,312				—				394,587
Total liabilities	3,552,613				(1,576,786		)		1,628,366				—				3,604,193
Shareholders' equity	2,205,976				4,032,250				2,681,514				(6,713,763		)		2,205,977
Non-controlling interest	—				(1,076		)		771,924				—				770,848
Total shareholders' equity	$	2,205,976			$	4,031,174			$	3,453,438			$	(6,713,763	)		$	2,976,825
Total Liabilities and Shareholders' Equity	$	5,758,589			$	2,454,388			$	5,081,804			$	(6,713,763	)		$	6,581,018

Income Statement for the Year Ended December 31, 2017:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net Sales	$	577,397			$	1,067,954			$	2,378,817			$	(142,412	)		$	3,881,756
Cost of sales	(440,911		)		(675,546		)		(1,808,370		)		108,384				(2,816,443		)
Gross profit (loss)	136,486				392,408				570,447				(34,028		)		1,065,313
Total operating expenses	(113,872		)		(123,423		)		(406,285		)		—				(643,580		)
Income (loss) from operations	22,614				268,985				164,162				(34,028		)		421,733
Interest (expense) income, net	(72,233		)		8,843				(5,314		)		—				(68,704		)
Other income (expense), net	5,103				289				(6,358		)		—				(966		)
Equity earnings (loss)	416,068				131,620				—				(547,688		)		—
Pretax income (loss)	371,552				409,737				152,490				(581,716		)		352,063
Income tax expense	(109,294		)		32,393				(12,872		)		—				(89,773		)
Net income (loss)	262,258				442,130				139,618				(581,716		)		262,290
Less: Net income attributable to noncontrolling interest	—				386				(415		)		—				(29		)
Net income (loss) attributable to Wabtec shareholders	$	262,258			$	442,516			$	139,203			$	(581,716	)		$	262,261
Comprehensive income (loss) attributable to Wabtec shareholders	$	263,907			$	442,516			$	472,167			$	(581,716	)		$	596,874

91

---

Income Statement for the Year Ended December 31, 2016:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net Sales	$	641,809			$	1,112,001			$	1,322,937			$	(145,559	)		$	2,931,188
Cost of sales	(473,700		)		(708,062		)		(928,608		)		103,421				(2,006,949		)
Gross profit (loss)	168,109				403,939				394,329				(42,138		)		924,239
Total operating expenses	(141,940		)		(122,617		)		(201,321		)		—				(465,878		)
(Loss) income from operations	26,169				281,322				193,008				(42,138		)		458,361
Interest (expense) income, net	(34,975		)		7,012				(14,598		)		—				(42,561		)
Other income (expense), net	20,509				(2,284		)		(21,188		)		—				(2,963		)
Equity earnings (loss)	322,650				131,234				—				(453,884		)		—
Pretax income (loss)	334,353				417,284				157,222				(496,022		)		412,837
Income tax expense	(29,466		)		(57,667		)		(12,300		)		—				(99,433		)
Net income (loss)	304,887				359,617				144,922				(496,022		)		313,404
Less: Net income attributable to noncontrolling interest	—				—				(8,517		)		—				(8,517		)
Net income attributable to Wabtec shareholders	$	304,887			$	359,617			$	136,405			$	(496,022	)		$	304,887
Comprehensive income (loss) attributable to Wabtec shareholders	$	305,180			$	359,617			$	33,226			$	(496,022	)		$	202,001

Income Statement for the Year Ended December 31, 2015:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net Sales	$	743,262			$	1,436,935			$	1,300,577			$	(172,776	)		$	3,307,998
Cost of sales	(531,269		)		(843,104		)		(976,798		)		90,989				(2,260,182		)
Gross (loss) profit	211,993				593,831				323,779				(81,787		)		1,047,816
Total operating expenses	(142,953		)		(131,251		)		(166,045		)		—				(440,249		)
(Loss) income from operations	69,040				462,580				157,734				(81,787		)		607,567
Interest (expense) income, net	(23,129		)		5,914				327				—				(16,888		)
Other income (expense), net	23,193				(9,140		)		(19,364		)		—				(5,311		)
Equity earnings (loss)	506,903				112,286				—				(619,189		)		—
Pretax income (loss)	576,007				571,640				138,697				(700,976		)		585,368
Income tax expense	(177,379		)		8,989				(18,350		)		—				(186,740		)
Net income (loss)	398,628				580,629				120,347				(700,976		)		398,628
Less: Net income attributable to noncontrolling interest	—				—				—				—				—
Net income attributable to Wabtec shareholders	$	398,628			$	580,629			$	120,347			$	(700,976	)		$	398,628
Comprehensive income (loss) attributable to Wabtec shareholders	$	409,734			$	580,629			$	(7,992	)		$	(700,976	)		$	281,395

    

92

---

Condensed Statement of Cash Flows for the year ended December 31, 2017:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net cash (used in) provided by operating activities	$	(49,231	)		$	249,204			$	22,866			$	(34,028	)		$	188,811
Net cash used in investing activities	(11,156		)		(120,661		)		(143,912		)		—				(275,729		)
Net cash provided by (used in) financing activities	58,798				(133,237		)		(57,020		)		34,028				(97,431		)
Effect of changes in currency exchange rates	—				—				19,266				—				19,266
Increase (decrease) in cash	(1,589		)		(4,694		)		(158,800		)		—				(165,083		)
Cash, beginning of year	2,522				9,496				386,466				—				398,484
Cash, end of year	$	933			$	4,802			$	227,666			$	—			$	233,401

Condensed Statement of Cash Flows for the year ended December 31, 2016:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net cash provided by (used in) operating activities	$	(44,611	)		$	332,822			$	204,457			$	(42,138	)		$	450,530
Net cash used in investing activities	(829,783		)		(14,725		)		69,443				—				(775,065		)
Net cash (used in) provided by financing activities	876,916				(321,758		)		(74,325		)		42,138				522,971
Effect of changes in currency exchange rates	—				—				(26,143		)		—				(26,143		)
(Decrease) increase in cash	2,522				(3,661		)		173,432				—				172,293
Cash, beginning of year	—				13,157				213,034				—				226,191
Cash, end of year	$	2,522			$	9,496			$	386,466			$	—			$	398,484

Condensed Statement of Cash Flows for the year ended December 31, 2015:

In thousands	Parent				Guarantors				Non-Guarantors				Elimination				Consolidated
Net cash provided by (used in) operating activities	$	(90,374	)		$	487,516			$	135,489			$	(81,787	)		$	450,844
Net cash used in investing activities	(7,862		)		(109,326		)		(262,948		)		—				(380,136		)
Net cash provided by (used in) financing activities	(48,570		)		(378,330		)		93,615				81,787				(251,498		)
Effect of changes in currency exchange rates	—				—				(18,868		)		—				(18,868		)
Increase in cash	(146,806		)		(140		)		(52,712		)		—				(199,658		)
Cash, beginning of year	146,806				13,297				265,746				—				425,849
Cash, end of year	$	—			$	13,157			$	213,034			$	—			$	226,191

22. OTHER (EXPENSE) INCOME, NET

The components of other (expense) income, net are as follows:

		For the year ended December 31,
In thousands		2017				2016				2015
Foreign currency loss		$	(6,618	)		$	(4,001	)		$	(4,659	)
Equity income		2,579				409				—
Other miscellaneous income (expense)		3,073				629				(652		)
Total other (expense) income, net		$	(966	)		$	(2,963	)		$	(5,311	)

 

93

---

23. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

 

		First				Second				Third				Fourth
In thousands, except per share data		Quarter				Quarter				Quarter				Quarter (1)
2017
Net sales		$	916,034			$	932,253			$	957,931			$	1,075,538
Gross profit		269,707				273,963				253,203				268,440
Income from operations		114,858				113,701				102,011				91,163
Net income attributable to Wabtec shareholders		73,889				72,025				67,399				48,948
Basic earnings from operations per common share		$	0.77			$	0.75			$	0.70			$	0.51
Diluted earnings from operations per common share		$	0.77			$	0.75			$	0.70			$	0.51
2016
Net sales		$	772,031			$	723,601			$	675,574			$	759,982
Gross profit		255,180				237,389				212,481				219,189
Income from operations		142,181				133,284				120,096				62,800
Net income attributable to Wabtec shareholders		94,163				90,485				82,428				46,328
Basic earnings from operations per common share		$	1.03			$	1.00			$	0.92			$	0.42
Diluted earnings from operations per common share		$	1.02			$	1.00			$	0.91			$	0.42

 (1) Results from the fourth quarter of 2017 include project adjustments related to prior periods which decreased income from operations by approximately $14.8 million. The effect of these project adjustments was not material.

The Company operates on a four-four-five week accounting quarter, and the quarters end on or about March 31, June 30 and September 30. The fiscal year ends on December 31. 

94

---

SCHEDULE II

WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION

VALUATION AND QUALIFYING ACCOUNTS

For each of the three years ended December 31 

In thousands		Balance at beginning of period				Charged/ (credited) to expense				Charged/ (credited) to other accounts (1)				Deductions from reserves (2)				Balance at end of period
2017
Warranty and overhaul reserves		$	138,992			$	50,385			$	12,234			$	48,548			$	153,063
Allowance for doubtful accounts		7,340				2,632				4,979				2,609				12,342
Valuation allowance-taxes		21,418				6,760				—				10,024				18,154
2016
Warranty and overhaul reserves		$	92,064			$	28,947			$	56,753			$	38,772			$	138,992
Allowance for doubtful accounts		5,614				3,635				—				1,909				7,340
Valuation allowance-taxes		12,623				3,405				5,390				—				21,418
2015
Warranty and overhaul reserves		$	87,849			$	35,418			$	(1,762	)		$	29,441			$	92,064
Allowance for doubtful accounts		6,270				2,026				—				2,682				5,614
Valuation allowance-taxes		1,818				7,024				3,781				—				12,623

 

(1)	Reserves of acquired/(sold) companies; valuation allowances for state and foreign deferred tax assets; impact of fluctuations in foreign currency exchange rates.

(2)	Actual disbursements and/or charges.

95

---

Item  16.	FORM 10-K SUMMARY

Not applicable.

96

---

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

 

		WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION
Date:	February 26, 2018	By:	/S/    RAYMOND T. BETLER
			Raymond T. Betler,
			President and Chief Executive Officer, and Director

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Company and in the capacities and on the dates indicated.

 

	Signature and Title	Date
By	/S/    ALBERT J. NEUPAVER	February 26, 2018
	Albert J. Neupaver, Chairman of the Board
By	/S/    RAYMOND T. BETLER	February 26, 2018
	Raymond T. Betler, President and Chief Executive Officer and Director (Principal Executive Officer)
By	/S/    PATRICK D. DUGAN	February 26, 2018
	Patrick D. Dugan, Executive Vice President Finance and Chief Financial Officer (Principal Financial Officer)
By	/S/    JOHN A. MASTALERZ	February 26, 2018
	John A. Mastalerz, Senior Vice President and Principal Accounting Officer
By	/S/    WILLIAM E. KASSLING	February 26, 2018
	William E. Kassling, Lead Director
By	/S/    PHILIPPE ALFROID	February 26, 2018
	Philippe Alfroid, Director
By	/S/    ROBERT J. BROOKS	February 26, 2018
	Robert J. Brooks, Director
By	/S/    ERWAN FAIVELEY	February 26, 2018
	Erwan Faiveley, Director

97

---

By	/S/    EMILIO A. FERNANDEZ	February 26, 2018
	Emilio A. Fernandez, Director
By	/S/    LEE B. FOSTER, II	February 26, 2018
	Lee B. Foster, II, Director
By	/S/    LINDA S. HARTY	February 26, 2018
	Linda S. Harty, Director
By	/S/    BRIAN P. HEHIR	February 26, 2018
	Brian P. Hehir, Director
By	/S/    MICHAEL W. D. HOWELL	February 26, 2018
	Michael W. D. Howell, Director
By	/S/    STEPHANE RAMBAUD-MEASSON	February 26, 2018
	Stephane Rambaud-Measson, Director
By	/S/    NICKOLAS W. VANDE STEEG	February 26, 2018
	Nickolas W. Vande Steeg, Director

98

Exhibit 21

SUBSIDIARIES AND AFFILIATES

Company		Jurisdiction of Incorporation		Ownership Interest
A and M Signalling Services Private Limited		India		100	%
Advanced Global Environmental LLC		Atlantic Beach, Florida		55	%
Aero Transportation Products, Inc		Independence, Missouri		100	%
Akapp-Stemmann BV		Ede, Netherlands		100	%
AM General Contractors SpA		Genova, Italy		100	%
A M Rail Group Limited		Burton-on-Trent, UK		100	%
A M Signalling Design Limited		Burton-on-Trent, UK		100	%
Ateliers Hubert Gerken S.A.		Belgium		100	%
Austbreck Pty, Ltd.		Hallam, Victoria, Australia		100	%
Barber Steel Foundry Corp.		Rothbury, Michigan		100	%
Barber Tian Rui Railway Supply LLC		Park Ridge, IL		50	%
Bearward Limited		Northampton, UK		100	%
Bearward Engineering Limited		Northampton, UK		100	%
Becorit GmbH		Recklinghausen,Germany		100	%
Beijing Wabtec Huaxia Technology Company Ltd.		Beijing, China		100	%
Brecknell Willis & Co., Ltd.		Char, Somerset, UK		100	%
Brecknell Willis Composites, Ltd.		Char, Somerset, UK		100	%
Brecknell Willis (Tianjin) Electrification Systems, Co., Ltd.		TianJin, China		100	%
Brecknell Willis Stemmann (Tianjin) Electrification Systems, Co., Ltd.		TianJin, China		100	%
Cambridge Forming and Cutting Ltd		Ontario, Canada		100	%
CoFren S.A.S.		Vierzon, France		100	%
CoFren S.r.l.		Avellino, Italy		100	%
Coleman Hydraulics Limited		Burton-on-Trent, UK		100	%
CZ-Carbon Prodcuts s.r.o.		Czech Republic		100	%
Datong Faiveley Railway Vehicle Equipment Co. Ltd.		Datong City6, China		50	%
Dia-Frag Industria e Comercio de Motopecas Ltda.		Monte Alto, Brazil		100	%
Durox Company		Strongville, Ohio		100	%
E-Carbon Asia Sdn. Bhd.		China		50	%
E-Carbon China Co., Ltd. .		China		70	%
E-Carbon Far East Limited		Hong Kong		100	%
E-Carbon Far East Ltd. Shanghai		Shanghai, China		60	%
E-Carbon H.K. Limited		Hong Kong		70	%
E-Carbon S.A.		Belgium		100	%
Electrical Carbon UK Limited		United Kingdom		100	%
Ellcon Drive LLC		Greenville, South Carolina		100	%
Evand Pty Ltd.		Wetherill Park, NSW, Australia		100	%
Faiveley Mapna Pars Rail		Karaj, Iran		51	%
Faiveley Rail Engineering Singapore Pte Ltd		Singapore		50	%
Faiveley Transport Amiens		Amiens, France		100	%
Faiveley Transport Asia Pacific Ltd.		Hong Kong		100	%
Faiveley Transport Australia Ltd.		Rosehill, NSW, Australia		100	%
Faiveley Transport Birkenhead Ltd.		Birkenhead, UK		100	%
Faiveley Transport Canada Inc.		Montreal, Canada		100	%
Faiveley Transport Czech a.s.		Blovice, Czech Republic		100	%
Faiveley Transport Chile Ltda.		Santiago, Chile		100	%

---

Company		Jurisdiction of Incorporation		Ownership Interest
Faiveley Transport DO Brasil Ltda.		Sao Paulo, Brazil		100	%
Faiveley Transport Far East Ltd		Hong Kong		100	%
Faiveley Transport Holding Gmbh & co KG		Whitten, Germany		100	%
Faiveley Transport Iberica SA		La Selva del Camp, Spain		100	%
Faiveley Transport Italia Spa		Turin, Italy		98.7	%
Faiveley Transport Korea Co. Ltd		Seoul, Korea		100	%
Faiveley Transport Leipzig GmbH & Co-KG		Scheuditz, Germany		100	%
Faiveley Transport Malmo AB		Landskrona, Sweden		100	%
Faiveley Transport Metro Technology Shanghai Co Ltd.		Shanghai, China		100	%
Faiveley Transport Metro Technology Taiwan Ltd.		Taipei, Taiwan		100	%
Faiveley Transport Metro Technology Thailand Co Ltd.		Bangkok, Thailand		100	%
Faiveley Transport Nordic AB		Landskrona, Sweden		100	%
Faiveley Transport North America Inc.		Greenville, South Carolina		100	%
Faiveley Transport Nowe GmbH		Elze, Germany		100	%
Faiveley Transport NSF		Neuville en Ferrain, France		100	%
Faiveley Transport Plezn s.r.o.		Nyrany, Chech Republic		100	%
Faiveley Transport Polska zoo		Poznan, Poland		100	%
Faiveley Transport Rail Technologies India Ltd.		Himachal Pradesh, India		100	%
Faiveley Transport Railway Trading Co. Ltd		Shanghai, China		100	%
Faiveley Transport S.A.		Gennevilliers, France		100	%
Faiveley Transport Schwab AG		Schaffhausen, Switzerland		100	%
Faiveley Transport Schweiz AG		Hagendorf, Switzerland		100	%
Faiveley Transport Service Maroc		Casablanca, Morocco		100	%
Faiveley Transport South Africa Pty (Ltd)		Monument Park, South Africa		100	%
Faiveley Transport Systems Technology (Beijing) Co. Ltd.		Beijing, China		100	%
Faiveley Transport Tamworth Ltd.		Tamworth, Staffordshire, UK		100	%
Faiveley Transport Tours		Saint Pierre des Corps, France		100	%
Faiveley Transport Tremosnice s.r.o.		Treomsnice, Czech Republic		100	%
Faiveley Transport USA Inc.		Greenville, South Carolina		100	%
Faiveley Transport Verwaltungs GmbH		Scheuditz, Germany		100	%
Faiveley Transport Witten GmbH		Witten, Germany		100	%
F.I.P. Pty Ltd.		Sydney, Australia		100	%
Fandstan Electric BV		Ede, Netherlands		100	%
Fandstan Electric Group, Ltd.		London, UK		100	%
Fandstan Electric Systems Pty, Ltd.		Gujarat, India		100	%
Fandstan Electric Systems, Ltd.		London, England		100	%
Fandstan Electric, Ltd.		London, UK		100	%
Fandstan Electric Systems, Ltd.		London, UK		100	%
F.T.M.T. Singapore Pte Ltd		Singapore		100	%
FW Acquisition LLC		Wilmington, Delaware		100	%
G&B Specialties, Inc.		Berwick, Pennsylvania		100	%
Gerken Group S.A.		Belgium		100	%
Gerken Nordiska Karma Aktiebolag		Sweden		49	%
Gerken SAS		France		72	%
Global Acquisition, S.a r.l.		Luxembourg		100	%

---

Company		Jurisdiction of Incorporation		Ownership Interest
Graham White Manufacturing Company		Salem, Virginia		100	%
GT Advanced Engineering and Technologies, Ltd.		Shanghai, China		100	%
GT Engineering & Associates, Ltd.		Hong Kong, China		100	%
Hubei Dengfeng Unifin Electrical Equipment Cooling System Co., Ltd.		Daye City, Hubei, China		69	%
Hunan CSR Wabtec Railway Transportation Technology Co. Ltd.		Changsha, Hunan, China		50	%
InTrans Engineering Limited		Kolkata, West Bengal, India		100	%
IP09 RCL Corporation		Wilmington, DE		100	%
J. & D. Gears Limited		Barton Under Needwood, England		100	%
Jiaxiang HK Smart Technology Co. Ltd.		Hong Kong, China		100	%
Keelex 351 Limited		Barton Under Needwood, England		100	%
LH Access Technology Limited		Barton Under Needwood, England		100	%
LH Group Holdings Limited		Barton Under Needwood, England		100	%
LH Group Services Limited		Barton Under Needwood, England		100	%
LH Group Wheelsets Limited		Barton Under Needwood, England		100	%
LH Plant (Burton) Limited		Barton, United Kingdom		100	%
Longwood Elastomers, Inc.		Wytheville, Virginia		100	%
Longwood Elastomers, S.A.		Soria, Spain		100	%
Longwood Engineered Products, Inc.		Greensboro, North Carolina		100	%
Longwood Industries, Inc.		Brenham, Texas		100	%
Longwood International, Inc.		Greensboro, North Carolina		100	%
LWI Elastomers International, S.L.		Madrid, Spain		100	%
LWI International B.V.		Amsterdam, Netherlands		100	%
Medagao (Suzhou) Rubber-Metal Components Co., Ltd		Suzhou, Jiangsu, China		100	%
Melett (Changzhou) Precision Machinery Co. Limited		Jiangsu, China		100	%
Melett Limited		South Yorkshire, England		100	%
Melett North America, Inc		Memphis, Tennessee		100	%
Melett Polska Spolka z Ograniczona odpowiedzialnoscia		Bydgos		100	%
Metalocaucho, S.L.		Urnieta, Gipuzkoa, Spain		100	%
Mors Smitt BV		Utrecht, Netherlands		100	%
Mors Smitt France S.A.S.		Sable sur Sarthe, France		100	%
Mors Smitt Holding S.A.S.		Utrecht, Netherlands		100	%
Mors Smitt Netherlands BV		Utrecht, Netherlands		100	%
Mors Smitt Technologies, Inc.		Buffalo Grove, IL		100	%
Mors Smitt UK Ltd.		West Midlands UK		100	%
MorsSmitt Asia, Ltd.		Kwun Tong, Hong Kong		100	%
MotivePower, Inc.		Boise, ID		100	%
MTC India Rubber Metal Components Private Limited		Bangalore, India		100	%
Napier Turbochargers (Holdings) Limited		Lincoln, Lincolnshire, UK		100	%
Napier Turbochargers Australia Pty Ltd.		Sydney, NSW, Australia		100	%
Napier Turbochargers Limited		Lincoln, Lincolnshire, UK		100	%
o.o.o. Faiveley Transport		Leningrad Region, Russia		100	%
Orion Engineering Ltd		Hong Kong, China		100	%
Pantrac GmbH		Germany		100	%
Parts Supply Limited		Leicestershire, England		100	%
Poli S.r.l.		Camisano, Italy		100	%

---

Company		Jurisdiction of Incorporation		Ownership Interest
Pride Bodies Ltd		Ontario, Canada		100	%
Qingdao Faiveley Sri Rail Brake Co. Ltd.		Qingdao, Shadong, China		50	%
Railroad Controls, L.P		Benbrook, TX		100	%
Railroad Friction Products Corporation		Maxton, NC		100	%
RCL, L.L.C.		Benbrook, TX		100	%
RCLP Acquisition LLC		Benbrook, TX		100	%
Relay Monitoring Systems Pty Ltd		Mulgrave, Australia		100	%
RFPC Holding Corporation		Wilmington, Delaware		100	%
Ricon Acquisition Corp.		San Fernando, California		100	%
Ricon Corp.		San Fernando, California		100	%
SAB Wabco Davies & Metcalfe Ltd.		Birkenhead, UK		100	%
SAB Wabco D & M Products Ltd.		Birkenhead, UK		100	%
SAB Wabco Investments Ltd.		Birkenhead, UK		100	%
SAB Wabco Ltd.		Birkenhead, UK		100	%
SAB Wabco Products Ltd.		Birkenhead, UK		100	%
SAB Wabco Sharavan		Sharavan, Iran		99	%
SAB Wabco UK Ltd.		Birkenhead, UK		100	%
Schaefer Equipment, Inc.		Warren, Ohio		100	%
SCT Europe Ltd.		Kirkcaldy, Fife, UK		100	%
SCT Technology LLC		Wilmington, Delaware		100	%
Semvac A/S		Odense, Denmark		100	%
Semvac Spare Parts A/S		Odense, Denmark		100	%
Shanghai Faiveley Railway Technology Co. Ltd.		Shanghai, China		51	%
Shenyang CRRC Wabtec Railway Brake Technology Company, Ltd.		Shenyang, China		50	%
Shijiazhuang Jiaxiang Precision Machinery Co. Ltd.		Shijiazhuang, China		100	%
Standard Car Truck Company		Park Ridge, IL		100	%
Standard Car Truck-Asia, Inc.		Chaoyang District, Beijing		100	%
Stemmann Technik France SAS		Buchelay, France		100	%
Stemmann-Technik GmbH		Schüttorf, Germany		100	%
Stemmann Technik Nederland BV		Rijnsburg, Netherlands		100	%
Stemmann Polska SP Zoo		Katy Wroclawskie, Poland		100	%
Suecobras Consultoria Ferroviaria Ltda		Rio de Janeiro, Brazil		100	%
Thermal Transfer Acquisition Corporation		Duquesne, Pennsylvania		100	%
The Vista Corporation of Virginia		Salem, Virginia		100	%
TransTech of SC, Inc		Piedmont, South Carolina		100	%
Turbonetics Holdings, Inc.		Moorpark, CA		100	%
Vapor Europe S.r.l.		Sassuolo, Modena, Italy		100	%
Vapor Rail Kapi Sistemleri Ticaret Ve Hizmetleri Limited Sirketi		Istanbul, Turkey		100	%
Vapor Ricon Europe Ltd.		Loughborough, Leicestershire, UK		100	%
Wabtec Assembly Services S. de R.L. de C.V.		San Luis Potosi, Mexico		100	%
Wabtec Australia Pty. Limited		Rydalmere, Australia		100	%
Wabtec (Beijing) Corporate Management Co. Ltd.		Beijing, Fengtai District, China		100	%
Wabtec Brasil Fabricacoa Manutencao de Equipamentos Ferroviarios Ltda		Juiz de For a, Brazil		100	%
Wabtec Corporation		Wilmerding, Pennsylvania		100	%
Wabtec Canada, Inc.		Ontario, Canada		100	%

---

Company		Jurisdiction of Incorporation		Ownership Interest
Wabtec China Friction Holding Limited		Hong Kong, China		100	%
Wabtec China Rail Products & Services Holding Limited		Hong Kong, China		100	%
Wabtec Coöperatief UA		Amsterdam, Netherlands		100	%
Wabtec Control Systems Pty Ltd		Osborne Park, WA, Australia		100	%
Wabtec de Mexico, S. de R.L. de C.V.		San Luis Potosi, Mexico		100	%
Wabtec Equipamentos Ferroviarios Ltda.		Sao Paulo, Brazil		100	%
Wabtec Europe GmbH		Brunn am Gebirge, Austria		100	%
Wabtec France S.A.S.		Paris, France		100	%
Wabtec FRG GmbH		Recklinghausen, Germany		100	%
Wabtec FRG Holdings GmbH & Co. KG		Recklinghausen, Germany		100	%
Wabtec Finance LLC		Wilmington, Delaware		100	%
Wabtec Golden Bridge Transportation Technology (Hangzhou) Company, Ltd.		Xinwan Town. China		100	%
Wabtec Holding Corp.		Wilmington, Delaware		100	%
Wabtec India Transportation Private Limited		Kolkata, India		100	%
Wabtec International, Inc.		Wilmington, Delaware		100	%
Wabtec Investments Limited LLC		Wilmington, Delaware		100	%
Wabtec Ireland Limited		Dublin, Ireland		100	%
Wabtec Jinxin (Wuxi) Heat Exchanger Co., Ltd.		Wuxi City, China		85	%
Wabtec Luxembourg, S.a r.l		Luxembourg		100	%
Wabtec Manufacturing, LLC		Wilmington, Delaware		100	%
Wabtec Manufacturing Mexico S. de R.L. de C.V.		San Luis Potosí, Mexico		100	%
Wabtec MZT AD Skopje		Skopje, Macedonia		87	%
Wabtec MZT Poland Sp. z.o.o.		Poznan, Poland		100	%
Wabtec Netherlands BV		Amsterdam, Netherlands		100	%
Wabtec Rail Limited		Doncaster, S.Yorkshire, UK		100	%
Wabtec Rail Scotland Limited		Kirkcaldy, Fife, Scotland		100	%
Wabtec Railway Electronics Corporation		Halifax, Nova Scotia, Canada		100	%
Wabtec Railway Electronics Holdings, LLC		Wilmington, Delaware		100	%
Wabtec Railway Electronics Manufacturing, Inc		Wilmington, Delaware		100	%
Wabtec Railway Electronics, Inc		Wilmington, Delaware		100	%
Wabtec Rus LLC		Moscow, Russia		100	%
Wabtec Servicios Administrativos, S.A. de C.V.		San Luis Potosi, Mexico		100	%
Wabtec South Africa Proprietary Limited		Kempton Park , South Africa		70	%
Wabtec Texmaco Rail Private Limited		Kolkata, India		60	%
Wabtec UK Holdings Limited		Staffordshire, England		100	%
Wabtec UK Investments Limited		Manchester, England		100	%
Wabtec UK Manufacturing Limited		Burton-on-Trent, UK		100	%
Wabtec-UWC Ltd.		Limassol, Cyprus		51	%
Westinghouse Railway Holdings (Canada) Inc.		Toronto, Ontario, Canada		100	%
Wilmerding International Holdings C.V.		Amsterdam, Netherlands		100	%
Workhorse Rail, LLC		Pittsburgh, Pennsylvania		100	%
Xorail, Inc.		Jacksonville, Florida		100	%
Young Touchstone Company		Oak Creek, Wisconsin		100	%
Zhongshan MorsSmitt Relay Ltd.		Zhongshan, China		100	%

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1)	Registration Statement (Form S-8 No. 333-53753) pertaining to the 1998 Employee Stock Purchase Plan of Westinghouse Air Brake Technologies Corporation,

(2)	Registration Statement (Form S-8 No. 333-39159) pertaining to the 1997 Executive Retirement Plan of Westinghouse Air Brake Technologies Corporation,

(3)	Registration Statement (Form S-8 No. 333-02979) pertaining to the 1995 Non-Employee Directors’ Fee and Stock Option Plan of Westinghouse Air Brake Technologies Corporation,

(4)	Registration Statement (Form S-8 No. 333-115014) pertaining to the 2004 Bonus Plan Agreements of Westinghouse Air Brake Technologies Corporation,

(5)	Registration Statement (Form S-8 No. 333-137985) pertaining to the 2000 Stock Incentive Plan of Westinghouse Air Brake Technologies Corporation,

(6)	Registration Statement (Form S-8 No. 333-41840) pertaining to the 2000 Stock Inventive Plan of Westinghouse Air Brake Technologies Corporation,

(7)	Registration Statement (Form S-8 No. 333-40468) pertaining to the 1995 Non-Employee Directors’ Fee and Stock Option Plan of Westinghouse Air Brake Technologies Corporation,

(8)	Registration Statement (Form S-8 No. 333-35744) pertaining to the 2000 Savings Plan of Westinghouse Air Brake Technologies Corporation,

(9)	Registration Statement (Form S-8 No. 333-89086) pertaining to the 2002 Employee Stock Ownership Plan of Westinghouse Air Brake Technologies Corporation,

(10)	Registration Statement (Form S-8 No. 333-179857) pertaining to the 2011 Stock Incentive Plan of Westinghouse Air Brake Technologies Corporation,

(11)	Registration Statement (Form S-3 No. 333-219657) of Westinghouse Air Brake Technologies Corporation,

(12)	Registration Statement (Form S-8 No. 219662) pertaining to the 1995 Non-Employee Directors' Fee and Stock Option Plan of Westinghouse Air Brake Technologies Corporation, and

(13)	Registration Statement (Form S-8 No. 219663) pertaining to the 2011 Stock Incentive Plan of Westinghouse Air Brake Technologies Corporation;

of our reports dated February 26, 2018, with respect to the consolidated financial statements and schedule of Westinghouse Air Brake Technologies Corporation and the effectiveness of internal control over financial reporting of Westinghouse Air Brake Technologies Corporation included in this Annual Report (Form 10-K) of Westinghouse Air Brake Technologies Corporation for the year ended December 31, 2017.

/s/ ERNST & YOUNG LLP

Pittsburgh, Pennsylvania

February 26, 2018

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S‑8 (Nos. 333-53753, 333-39159, 333-02979, 333-115014, 333-137985, 333-41840, 333-40468, 333-35744, 333-89086, 333-179857, 333-219662, and 333-219663) and Form S-3 (No. 333-219657) of WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION of our report dated February 23, 2017 relating to the financial statements of Faiveley Transport, which appears in this Annual Report on Form 10-K of Westinghouse Air Brake Technologies Corporation.

/s/ PricewaterhouseCoopers Audit

Neuilly-sur-Seine, France

February 26, 2018

Exhibit 31.1

CERTIFICATION

I, Raymond T. Betler, certify that:

1. I have reviewed this annual report on Form 10-K of Westinghouse Air Brake Technologies Corporation.

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and we have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this annual report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this annual report based on such evaluation; and

(d) Disclosed in this annual report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 26, 2018

 

By:	/s/    Raymond T. Betler
Name:	Raymond T. Betler
Title:	President and Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, Patrick D. Dugan, certify that:

1. I have reviewed this annual report on Form 10-K of Westinghouse Air Brake Technologies Corporation.

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and we have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this annual report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this annual report based on such evaluation; and

(d) Disclosed in this annual report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 26, 2018

 

By:	/S/    PATRICK D. DUGAN
Name:	Patrick D. Dugan
Title:	Executive Vice President Finance and Chief Financial Officer

Exhibit 32.1

CERTIFICATION

Pursuant to 18 U.S.C. § 1350, the undersigned officers of Westinghouse Air Brake Technologies Corporation (the “Company”), hereby certify, to the best of their knowledge, that the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

                        

By:		/s/    RAYMOND T. BETLER
		Raymond T. Betler President and Chief Executive Officer
Date:		February 26, 2018
By:		/s/    PATRICK D. DUGAN
		Patrick D. Dugan Executive Vice President Finance and Chief Financial Officer
Date:		February 26, 2018

v3.8.0.1

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 16, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORP
Entity Central Index Key	0000943452
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Trading Symbol	WAB
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		96,090,518
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7.8

X

- Definition If the value is true, then the document is an amendment to previously-filed/accepted document. + References No definition available. + Details Name: dei_AmendmentFlag Namespace Prefix: dei_ Data Type: xbrli:booleanItemType Balance Type: na Period Type: duration

X

- Definition End date of current fiscal year in the format --MM-DD. + References No definition available. + Details Name: dei_CurrentFiscalYearEndDate Namespace Prefix: dei_ Data Type: xbrli:gMonthDayItemType Balance Type: na Period Type: duration

X

- Definition This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. + References No definition available. + Details Name: dei_DocumentFiscalPeriodFocus Namespace Prefix: dei_ Data Type: dei:fiscalPeriodItemType Balance Type: na Period Type: duration

X

- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. + References No definition available. + Details Name: dei_DocumentFiscalYearFocus Namespace Prefix: dei_ Data Type: xbrli:gYearItemType Balance Type: na Period Type: duration

X

- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details Name: dei_DocumentPeriodEndDate Namespace Prefix: dei_ Data Type: xbrli:dateItemType Balance Type: na Period Type: duration

X

- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". + References No definition available. + Details Name: dei_DocumentType Namespace Prefix: dei_ Data Type: dei:submissionTypeItemType Balance Type: na Period Type: duration

X

- Definition A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details Name: dei_EntityCentralIndexKey Namespace Prefix: dei_ Data Type: dei:centralIndexKeyItemType Balance Type: na Period Type: duration

X

- Definition Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. + References No definition available. + Details Name: dei_EntityCommonStockSharesOutstanding Namespace Prefix: dei_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Indicate "Yes" or "No" whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure. + References No definition available. + Details Name: dei_EntityCurrentReportingStatus Namespace Prefix: dei_ Data Type: dei:yesNoItemType Balance Type: na Period Type: duration

X

- Definition Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. + References No definition available. + Details Name: dei_EntityFilerCategory Namespace Prefix: dei_ Data Type: dei:filerCategoryItemType Balance Type: na Period Type: duration

X

- Definition State aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to price at which the common equity was last sold, or average bid and asked price of such common equity, as of the last business day of registrant's most recently completed second fiscal quarter. The public float should be reported on the cover page of the registrants form 10K. + References No definition available. + Details Name: dei_EntityPublicFloat Namespace Prefix: dei_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details Name: dei_EntityRegistrantName Namespace Prefix: dei_ Data Type: xbrli:normalizedStringItemType Balance Type: na Period Type: duration

X

- Definition Indicate "Yes" or "No" if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. + References No definition available. + Details Name: dei_EntityVoluntaryFilers Namespace Prefix: dei_ Data Type: dei:yesNoItemType Balance Type: na Period Type: duration

X

- Definition Indicate "Yes" or "No" if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A. + References No definition available. + Details Name: dei_EntityWellKnownSeasonedIssuer Namespace Prefix: dei_ Data Type: dei:yesNoItemType Balance Type: na Period Type: duration

X

- Definition Trading symbol of an instrument as listed on an exchange. + References No definition available. + Details Name: dei_TradingSymbol Namespace Prefix: dei_ Data Type: xbrli:normalizedStringItemType Balance Type: na Period Type: duration

X

- Definition Document and entity information. + References No definition available. + Details Name: wab_DocumentAndEntityInformationAbstract Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 233,401	$ 398,484
Accounts receivable	800,619	667,596
Unbilled accounts receivable	366,168	274,912
Inventories	742,634	658,510
Deposits in escrow	0	744,748
Other assets	122,291	123,381
Total current assets	2,265,113	2,867,631
Property, plant and equipment	1,026,046	912,230
Accumulated depreciation	(452,074)	(393,854)
Property, plant and equipment, net	573,972	518,376
Other Assets
Goodwill	2,460,103	2,078,765
Other intangibles, net	1,204,432	1,053,860
Other noncurrent assets	76,360	62,386
Total other assets	3,740,895	3,195,011
Total Assets	6,579,980	6,581,018
Current Liabilities
Accounts payable	552,525	530,211
Customer deposits	369,716	256,591
Accrued compensation	164,210	145,324
Accrued warranty	137,542	123,190
Current portion of long-term debt	47,225	129,809
Other accrued liabilities	302,112	261,514
Total current liabilities	1,573,330	1,446,639
Long-term debt	1,823,303	1,762,967
Accrued postretirement and pension benefits	103,734	110,597
Deferred income taxes	175,902	245,680
Accrued warranty	15,521	15,802
Other long-term liabilities	59,658	22,508
Total liabilities	3,751,448	3,604,193
Commitment and Contingencies (Note 19)
Equity
Preferred stock, 1,000,000 shares authorized, no shares issued	0	0
Common stock, $.01 par value; 200,000,000 shares authorized: 132,349,534 shares issued and 96,034,352 and 95,425,432 outstanding at December 31, 2017 and December 31, 2016, respectively	1,323	1,323
Additional paid-in capital	906,616	869,951
Treasury stock, at cost, 36,315,182 and 36,924,102 shares, at December 31, 2017 and December 31, 2016, respectively	(827,379)	(838,950)
Retained earnings	2,773,300	2,553,258
Accumulated other comprehensive loss	(44,992)	(379,605)
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	2,808,868	2,205,977
Noncontrolling interest	19,664	770,848
Total equity	2,828,532	2,976,825
Total Liabilities and Equity	$ 6,579,980	$ 6,581,018

X

- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_AccountsPayableCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_AccountsReceivableNetCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_AdditionalPaidInCapitalCommonStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_Assets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details Name: us-gaap_AssetsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_AssetsCurrentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),19) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CommitmentsAndContingencies Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CustomerDepositsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 + Details Name: us-gaap_DeferredIncomeTaxLiabilitiesNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_EmployeeRelatedLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_EscrowDeposit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_IntangibleAssetsNetExcludingGoodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details Name: us-gaap_InventoryNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_Liabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(23)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(25)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(32)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LiabilitiesAndStockholdersEquity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.21) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_LiabilitiesCurrentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_MinorityInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e7018-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_OtherAccruedLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of current assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_OtherAssetsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_OtherAssetsNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_OtherAssetsNoncurrentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_OtherLiabilitiesNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details Name: us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68070138&loc=d3e11281-110244 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12524-110249 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_ProductWarrantyAccrualClassifiedCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14394-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details Name: us-gaap_ProductWarrantyAccrualNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PropertyPlantAndEquipmentGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_PropertyPlantAndEquipmentNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_RetainedEarningsAccumulatedDeficit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_StockholdersEquity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details Name: us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details Name: us-gaap_TreasuryStockValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details Name: us-gaap_UnbilledReceivablesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Other Non-Current Assets that includes Goodwill, Other Intangibles net, and Other noncurrent assets. + References No definition available. + Details Name: wab_OtherAssetsNonCurrentIncludingGoodwillAndIntangibleAssetsNet Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.8.0.1

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	132,349,534	132,349,534
Common stock, shares outstanding (in shares)	96,034,352	95,425,432
Treasury stock, shares (in shares)	36,315,182	36,924,102

X

- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockParOrStatedValuePerShare Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockSharesAuthorized Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockSharesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details Name: us-gaap_CommonStockSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockSharesAuthorized Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockSharesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- References No definition available. + Details Name: us-gaap_StatementOfFinancialPositionAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details Name: us-gaap_TreasuryStockShares Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

v3.8.0.1

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,881,756	$ 2,931,188	$ 3,307,998
Cost of sales	(2,816,443)	(2,006,949)	(2,260,182)
Gross profit	1,065,313	924,239	1,047,816
Selling, general and administrative expenses	(511,898)	(371,805)	(347,373)
Engineering expenses	(95,166)	(71,375)	(71,213)
Amortization expense	(36,516)	(22,698)	(21,663)
Total operating expenses	(643,580)	(465,878)	(440,249)
Income from operations	421,733	458,361	607,567
Other income and expenses
Interest expense, net	(68,704)	(42,561)	(16,888)
Other (expense) income, net	(966)	(2,963)	(5,311)
Income from operations before income taxes	352,063	412,837	585,368
Income tax expense	(89,773)	(99,433)	(186,740)
Net income	262,290	313,404	398,628
Less: Net income attributable to noncontrolling interest	(29)	(8,517)	0
Net income attributable to Wabtec shareholders	$ 262,261	$ 304,887	$ 398,628
Basic
Net income attributable to Wabtec shareholders (in dollars per share)	$ 2.74	$ 3.37	$ 4.14
Diluted
Net income attributable to Wabtec shareholders (in dollars per share)	$ 2.72	$ 3.34	$ 4.10
Weighted average shares outstanding
Basic (in shares)	95,453	90,359	96,074
Diluted (in shares)	96,125	91,141	97,006

X

- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_AmortizationOfIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_CostOfGoodsAndServicesSold Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareBasic Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareBasicAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareDiluted Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareDilutedAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_GrossProfit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_IncomeStatementAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_InterestIncomeExpenseNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_NetIncomeLossAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NonoperatingIncomeExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NonoperatingIncomeExpenseAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details Name: us-gaap_OperatingExpenses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details Name: us-gaap_OperatingIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_ProfitLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details Name: us-gaap_ResearchAndDevelopmentExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details Name: us-gaap_SellingGeneralAndAdministrativeExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

v3.8.0.1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income attributable to Wabtec shareholders	$ 262,261	$ 304,887	$ 398,628
Foreign currency translation gain (loss)	326,096	(93,684)	(132,899)
Unrealized gain (loss) on derivative contracts	9,799	305	(1,202)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans	2,845	(12,021)	26,689
Other comprehensive gain (loss) before tax	338,740	(105,400)	(107,412)
Income tax (expense) benefit related to components of other comprehensive (loss) income	(4,127)	2,514	(9,821)
Other comprehensive income (loss), net of tax	334,613	(102,886)	(117,233)
Comprehensive income attributable to Wabtec shareholders	$ 596,874	$ 202,001	$ 281,395

X

- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details Name: us-gaap_ComprehensiveIncomeNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount before tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details Name: us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details Name: us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details Name: us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details Name: us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 262,290	$ 313,404	$ 398,628
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	103,248	69,795	64,734
Stock-based compensation expense	21,287	20,813	26,019
Deferred income taxes	(67,423)	(10,228)	4,981
Loss on disposal of property, plant and equipment	1,907	232	587
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(68,676)	19,728	21,500
Inventories	(8,955)	45,340	20,147
Accounts payable	(91,722)	(18,932)	(76,650)
Accrued income taxes	47,644	(11,759)	21,740
Accrued liabilities and customer deposits	(18,891)	(11,338)	(14,837)
Other assets and liabilities	8,102	33,475	(16,005)
Net cash provided by operating activities	188,811	450,530	450,844
Investing Activities
Purchase of property, plant and equipment	(89,466)	(50,216)	(49,428)
Proceeds from disposal of property, plant and equipment	1,291	363	1,784
Acquisitions of business, net of cash acquired	(921,537)	(183,113)	(129,550)
Deposit in escrow	733,983	(542,099)	(202,942)
Net cash used for investing activities	(275,729)	(775,065)	(380,136)
Financing Activities
Proceeds from debt	1,216,740	1,875,000	787,400
Payments of debt	(1,269,537)	(1,102,748)	(612,680)
Stock re-purchase	0	(212,176)	(387,787)
Proceeds from exercise of stock options and other benefit plans	4,428	1,983	3,097
Payment of income tax withholding on share-based compensation	(6,844)	(6,658)	(14,565)
Cash dividends ($0.44, $0.36, and $0.28 per share for the years ended December 31, 2017, 2016 and 2015)	(42,218)	(32,430)	(26,963)
Net cash (used for) provided by financing activities	(97,431)	522,971	(251,498)
Effect of changes in currency exchange rates	19,266	(26,143)	(18,868)
(Decrease) increase in cash	(165,083)	172,293	(199,658)
Cash, beginning of year	398,484	226,191	425,849
Cash, end of year	$ 233,401	$ 398,484	$ 226,191

X

- References No definition available. + Details Name: us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details Name: us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_DeferredIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_DepreciationAndAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details Name: us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_GainLossOnSaleOfPropertyPlantEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_IncreaseDecreaseInAccountsPayable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_IncreaseDecreaseInAccountsReceivable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_IncreaseDecreaseInInventories Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_IncreaseDecreaseInOperatingCapitalAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details Name: us-gaap_IncreaseDecreaseInRestrictedCash Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details Name: us-gaap_NetCashProvidedByUsedInFinancingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details Name: us-gaap_NetCashProvidedByUsedInInvestingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details Name: us-gaap_NetCashProvidedByUsedInOperatingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsForRepurchaseOfCommonStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsOfDividendsCommonStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details Name: us-gaap_ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details Name: us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_ProfitLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details Name: us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_ShareBasedCompensation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Increase decrease in accrued liabilities and customer deposits. + References No definition available. + Details Name: wab_IncreaseDecreaseInAccruedLiabilitiesAndCustomerDeposits Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Cash dividends, per share (in dollars per share)	$ 0.44	$ 0.36	$ 0.28

X

- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details Name: us-gaap_CommonStockDividendsPerShareCashPaid Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_StatementOfCashFlowsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance beginning of period at Dec. 31, 2014	$ 1,808,974	$ 1,323	$ 448,531	$ (392,262)	$ 1,909,136	$ (159,486)	$ 1,732
Beginning Balance (in shares) at Dec. 31, 2014		132,349,534		36,075,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017)	(26,963)				(26,963)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	2,007		(2,918)	$ 4,925
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				450,738
Stock based compensation	23,713		23,713
Net income	398,628				398,628
Translation adjustment	(132,899)					(132,899)
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017)	(66)					(66)
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017)	(678)					(678)
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017)	16,410					16,410
Stock repurchase, shares (in shares)				(4,889,027)
Stock repurchase, value	(387,787)			$ (387,787)
Balance end of period at Dec. 31, 2015	1,701,339	$ 1,323	469,326	$ (775,124)	2,280,801	(276,719)	1,732
Ending Balance (in shares) at Dec. 31, 2015		132,349,534		40,513,428
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017)	(32,430)				(32,430)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(3,452)		(8,490)	$ 5,038
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				328,245
Stock based compensation	17,748		17,748
Acquisition of Faiveley Transport noncontrolling interest	760,599						760,599
Net income	313,404				304,887		8,517
Translation adjustment	(93,684)					(93,684)
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017)	(324)					(324)
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017)	354					354
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017)	(9,232)					(9,232)
Stock issued for Faiveley Transport Acquisition	534,679		391,367	$ 143,312
Stock issued for Faiveley Transport Acquisition (in shares)				6,307,489
Stock repurchase, shares (in shares)				(3,046,408)
Stock repurchase, value	(212,176)			$ (212,176)
Balance end of period at Dec. 31, 2016	2,976,825	$ 1,323	869,951	$ (838,950)	2,553,258	(379,605)	770,848
Ending Balance (in shares) at Dec. 31, 2016		132,349,534		36,924,102
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017)	(42,218)				(42,218)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(2,416)		(7,361)	$ 4,945
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				608,920
Stock based compensation	16,650		16,650	$ 0
Acquisition of Faiveley Transport noncontrolling interest	(742,282)		8,931				(751,213)
Net income	262,290				262,261		29
Translation adjustment	326,095					326,095
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017)	2,282					2,282
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017)	4,689					4,689
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017)	1,546					1,546
Stock issued for Faiveley Transport Acquisition	25,071		18,445	6,626
Balance end of period at Dec. 31, 2017	$ 2,828,532	$ 1,323	$ 906,616	$ (827,379)	$ 2,773,301	$ (44,993)	$ 19,664
Ending Balance (in shares) at Dec. 31, 2017		132,349,534		36,315,182

X

- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details Name: us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details Name: us-gaap_DividendsCash Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_IncreaseDecreaseInStockholdersEquityRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4616395-111683 + Details Name: us-gaap_MinorityInterestDecreaseFromRedemptions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase in noncontrolling interest from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32157-110900 + Details Name: us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details Name: us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_ProfitLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details Name: us-gaap_SharesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details Name: us-gaap_StockIssuedDuringPeriodSharesAcquisitions Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Value of stock issued pursuant to acquisitions during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_StockIssuedDuringPeriodValueAcquisitions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details Name: us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details Name: us-gaap_StockRepurchasedDuringPeriodShares Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_StockRepurchasedDuringPeriodValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details Name: us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Stock awards granted, exercised and cancelled for the following forms of stock compensation 1) Stock Options 2) Restricted Stock Awards and 3) Incentive Stock Awards. + References No definition available. + Details Name: wab_StockGrantedExercisedAndCancelledForVariousEquityInstruments Namespace Prefix: wab_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_TreasuryStockMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends, per share (in dollars per share)	$ 0.44	$ 0.36	$ 0.28
Unrealized gain (loss) on foreign exchange contracts, tax	$ 1,763	$ 45	$ 14
Unrealized gain (loss) on interest rate swap contracts, tax	1,079	230	444
Change in pension and post retirement benefit plans, tax	$ 1,300	$ 2,790	$ 10,279

X

- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details Name: us-gaap_CommonStockDividendsPerShareCashPaid Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_StatementOfStockholdersEquityAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

BUSINESS	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BUSINESS	BUSINESS Wabtec is one of the world’s largest providers of value-added, technology-based equipment, systems and services for the global passenger transit and freight rail industries. Our highly engineered products, which are intended to enhance safety, improve productivity and reduce maintenance costs for customers, can be found on most locomotives, freight cars, passenger transit cars and buses around the world. Our products enhance safety, improve productivity and reduce maintenance costs for customers, and many of our core products and services are essential in the safe and efficient operation of freight rail and passenger transit vehicles. Wabtec is a global company with operations in 31 countries and our products can be found in more than 100 countries throughout the world. In 2017, about 66% of the Company’s revenues came from customers outside the U.S.

X

- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details Name: us-gaap_NatureOfOperations Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation The consolidated financial statements include the accounts of the Company and all subsidiaries that it controls. For consolidated subsidiaries in which the Company's ownership is less than 100%, the outside shareholders' interests are shown as noncontrolling interests. These statements have been prepared in accordance with U.S. generally accepted accounting principles. Sales between subsidiaries are billed at prices consistent with sales to third parties and are eliminated in consolidation. Cash Equivalents Cash equivalents are highly liquid investments purchased with an original maturity of three months or less. Allowance for Doubtful Accounts The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The allowance for doubtful accounts was $12.3 million and $7.3 million as of December 31, 2017 and 2016, respectively. Inventories Inventories are stated at the lower of cost or market. Cost is determined under the first-in, first-out (FIFO) method. Inventory costs include material, labor and overhead. Property, Plant and Equipment Property, plant and equipment additions are stated at cost. Expenditures for renewals and improvements are capitalized. Expenditures for ordinary maintenance and repairs are expensed as incurred. The Company computes book depreciation principally on the straight-line method. Accelerated depreciation methods are utilized for income tax purposes. Leasing Arrangements The Company conducts a portion of its operations from leased facilities and finances certain equipment purchases through lease agreements. In those cases in which the lease term approximates the useful life of the leased asset or the lease meets certain other prerequisites, the leasing arrangement is classified as a capital lease. The remaining arrangements are treated as operating leases. Goodwill and Intangible Assets Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles (with definite lives) are amortized on a straight-line basis over their estimated economic lives. Amortizable intangible assets are reviewed for impairment when indicators of impairment are present. The Company tests goodwill and indefinite-lived intangible assets for impairment at the reporting unit level and at least annually. The Company performs its annual impairment test during the fourth quarter after the annual forecasting process is completed, and also tests for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Periodically, Management of the Company assesses whether or not an indicator of impairment is present that would necessitate an impairment analysis be performed. For 2017, the Company opted to proceed directly to the two-step quantitative impairment test for all reporting units with goodwill. In the first step of the quantitative assessment, our assets and liabilities, including existing goodwill and other intangible assets, are assigned to the identified reporting units to determine the carrying value of the reporting units. The income approach and the market approach are weighted at 50% and 50%, respectively, in arriving at fair value. The discounted cash flow model requires several assumptions including future sales growth, EBIT (earnings before interest and taxes) margins and capital expenditures for the reporting units. The discounted cash flow model also requires the use of a discount rate and a terminal revenue growth rate (the revenue growth rate for the period beyond the years forecasted by the reporting units), as well as projections of future operating margins. The market approach requires several assumptions including EBITDA (earnings before interest, taxes, depreciation and amortization) multiples for comparable companies that operate in the same markets as the Company’s reporting units. The estimated fair value of all reporting units was substantially in excess of its respective carrying value, which resulted in a conclusion that no impairment existed. Additionally, the Company proceeded directly to the quantitative impairment test for some trade names with indefinite lives. The fair value of all trade names subject to the quantitative impairment test exceeded its respective carrying value, resulting in a conclusion that no impairment existed. For trade names not subject to the quantitative testing, the Company opted to perform a qualitative trade name impairment assessment and determined from the qualitative assessment that it was not more likely than not that the estimated fair values of the trade names were less than their carrying values; therefore, no further analysis was required. In assessing the qualitative factors to determine whether it is more likely than not that the fair value of a trade name is less than its carrying amount, we assess relevant events and circumstances that may impact the fair value and the carrying amount of the trade name. The identification of relevant events and circumstances and how these may impact a trade name’s fair value or carrying amount involve significant judgments and assumptions. The judgment and assumptions include the identification of macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, Wabtec specific events, share price trends and making the assessment on whether each relevant factor will impact the impairment test positively or negatively and the magnitude of any such impact. Warranty Costs Warranty costs are accrued based on Management’s estimates of repair or upgrade costs per unit and historical experience. Warranty expense was $50.4 million, $28.9 million and $35.4 million for 2017, 2016 and 2015, respectively. Accrued warranty was $153.1 million and $139.0 million at December 31, 2017 and 2016, respectively. Income Taxes Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws. The provision for income taxes includes federal, state and foreign income taxes. Stock-Based Compensation The Company recognizes compensation expense for stock-based compensation based on the grant date fair value amortized ratably over the requisite service period following the date of grant. Financial Derivatives and Hedging Activities The Company has entered into foreign currency forward contracts to reduce the impact of changes in currency exchange rates. Foreign currency forward contracts are agreements with a counterparty to exchange two distinct currencies at a set exchange rate for delivery on a set date at some point in the future. There is no exchange of funds until the delivery date. At the delivery date, the Company can either take delivery of the currency or settle on a net basis. For further information regarding the foreign currency forward contracts, see Footnote 17. To reduce the impact of interest rate changes on a portion of its variable-rate debt, the Company has entered into an interest rate swap agreement with a notional value of $150 million. As of December 31, 2017, the Company has recorded a current liability of $1.2 million and a corresponding offset in accumulated other comprehensive loss of $0.7 million, net of tax, related to these agreements. For further information regarding the interest rate swap agreement, see Footnote 17. Foreign Currency Translation Assets and liabilities of foreign subsidiaries, except for the Company’s Mexican operations whose functional currency is the U.S. Dollar, are translated at the rate of exchange in effect on the balance sheet date while income and expenses are translated at the average rates of exchange prevailing during the period. Foreign currency gains and losses resulting from transactions, and the translation of financial statements are recorded in the Company’s consolidated financial statements based upon the provisions of Accounting Standards Codification (“ASC”) 830, “Foreign Currency Matters.” The effects of currency exchange rate changes on intercompany transactions and balances of a long-term investment nature are accumulated and carried as a component of accumulated other comprehensive loss. The effects of currency exchange rate changes on intercompany transactions that are denominated in a currency other than an entity’s functional currency are charged or credited to earnings. Foreign exchange transaction losses recognized in other (expense) income, net were $6.6 million, $4.0 million and $4.7 million for 2017, 2016 and 2015, respectively. Noncontrolling Interests In accordance with ASC 810, the Company has classified noncontrolling interests as equity on our condensed consolidated balance sheets as of December 31, 2017 and 2016. Net income attributable to noncontrolling interests was $8.5 million for the year ended December 31, 2016. Net income attributable to noncontrolling interest was not material for the years ended December 31, 2017 and 2015. Other comprehensive income attributable to noncontrolling interests for the years ended December 31, 2017, 2016 and 2015 was not material. Revenue Recognition Revenue is recognized in accordance with ASC 605 “Revenue Recognition,”  The Company recognizes revenue when the following criteria are met: 1) persuasive evidence of an arrangement exists; 2) delivery has occurred; 3) an established sales price has been set with the customer; 4) collection of the sale revenue from the customer is reasonably assured; and 5) no contingencies exist.  Delivery is considered to have occurred when the customer assumes the risk and rewards of ownership.  The Company estimates and records provisions for quantity rebates and sales returns and allowances as an offset to revenue in the same period the related revenue is recognized, based upon its experience.  These items are included as a reduction in deriving net sales. In general, the Company recognizes revenues on long-term contracts based on the percentage of completion method of accounting. The units-of-delivery method or other input-based or output-based measures, as appropriate, are used to measure the progress toward completion of individual contracts. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and adjustments are reflected in the accounting period as such amounts are determined. Provisions are made currently for estimated losses on uncompleted contracts. Unbilled accounts receivables were $366.2 million and $274.9 million, customer deposits were $369.7 million and $256.6 million, and provisions for loss contracts were $94.0 million and $60.5 million at December 31, 2017 and 2016, respectively. Certain pre-production costs relating to long-term production and supply contracts have been deferred and will be recognized over the life of the contracts. Deferred pre-production costs were $20.2 million and $29.4 million at December 31, 2017 and 2016, respectively. Significant Customers and Concentrations of Credit Risk The Company’s trade receivables are from rail and transit industry original equipment manufacturers, Class I railroads, railroad carriers and commercial companies that utilize rail cars in their operations, such as utility and chemical companies. No one customer accounted for more than 10% of the Company’s consolidated net sales in 2017, 2016 or 2015. Shipping and Handling Fees and Costs All fees billed to the customer for shipping and handling are classified as a component of net revenues. All costs associated with shipping and handling are classified as a component of cost of sales. Research and Development Research and development costs are charged to expense as incurred. For the years ended December 31, 2017, 2016 and 2015, the Company incurred costs of approximately $95.2 million, $71.4 million, and $71.2 million, respectively. Earnings Per Share Basic and diluted earnings per common share is computed in accordance with ASC 260 “Earnings Per Share.” Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and included in the computation of earnings per share pursuant to the two-class method included in ASC 260-10-55. (See Note 11 “Earnings Per Share” included herein) Reclassifications Certain prior year amounts have been reclassified, where necessary, to conform to the current year presentation. Refer to Recently Adopted Accounting Pronouncements below. Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from the estimates. On an ongoing basis, Management reviews its estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.                         Recently Issued Accounting Pronouncements In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income". The amendments in this update address certain stranded income tax effects in accumulated other comprehensive income ("AOCI") resulting from the Tax Cuts and Jobs Act ("TCJA"). Current guidance requires the effect of a change in tax laws or rates on deferred tax balances to be reported in income from continuing operations in the accounting period that includes the period of enactment, even if the related income tax effects were originally charged or credited directly to AOCI. The amount of the reclassification would include the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of the enactment of TCJA related to items in AOCI. The updated guidance is effective for reporting periods beginning after December 15, 2018 and is to be applied retrospectively to each period in which the effect of the TCJA related to items remaining in AOCI are recognized or at the beginning of the period of adoption. Early adoption is permitted. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost". The amendments in this update require the service cost component of net benefit costs to be reported in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented in the income statement separately from the service cost component and outside income from operations. This update also allows the service cost component to be eligible for capitalization when applicable. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption was permitted as of the beginning of an annual period. The amendments should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements.      In January 2017, the FASB issued ASU No. 2017-04 "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment". The amendments in this update eliminate the requirement to perform Step 2 of the goodwill impairment test. Instead, an entity should perform a goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value up to the carrying amount of the goodwill. The ASU is effective for public companies in the fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The impact of adopting this guidance could result in a change in the overall conclusion as to whether or not a reporting units' goodwill is impaired and the amount of an impairment charge recognized in the event a reporting units' carrying value exceeds its fair value. All of the Company's reporting units had fair values that were greater than the carrying value as of the Company's last quantitative goodwill impairment test, which was performed as of October 1, 2017. In November 2016, the FASB issued ASU No. 2016-18 "Statement of Cash Flows (Topic 230): Restricted Cash". The amendments in this update require a statement of cash flows to explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 814)" which requires lessees to recognize a right of use asset and lease liability on the balance sheet for all leases with terms longer than 12 months. For leases with terms less than 12 months, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right of use asset and lease liability. The ASU is effective for public companies in the fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contract with Customers.”  The ASU will supersede most of the existing revenue recognition requirements in U.S. GAAP and will require entities to recognize revenue at an amount that reflects the consideration to which the Company expects to be entitled in exchange for transferring goods or services to a customer.  The new standard also requires significantly expanded disclosures regarding the qualitative and quantitative information of an entity’s nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.  The Board voted to propose that the standard would take effect for reporting periods beginning after December 15, 2017 and that early adoption would be allowed as of the original effective date. The impact to results is not anticipated to be material because the analysis of the Company's current long-term contracts under the new revenue recognition standard supports the recognition of revenue over time under the cost-to-cost method for substantially all of our long-term contracts, which is consistent with our current revenue recognition model. The Company plans to adopt this accounting standard update using the modified retrospective method, with the cumulative effect of initially applying this update recognized in the first reporting period of 2018. The Company has evaluated new disclosure requirements and is implementing appropriate changes to its business processes and controls to support disclosure under the new guidance. Recently Adopted Accounting Pronouncements In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”. The ASU simplifies several aspects for the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The ASU became effective for public companies during interim and annual reporting periods beginning after December 15, 2016. In accordance with this update, the Company began recognizing all excess tax deficiencies and tax benefits from share-based payment awards as a benefit or expense to income tax in the income statement. This update has been adopted prospectively in accordance with the ASU and the impact of adoption on the income statement was not material. Additionally, in accordance with this update, the Company began classifying excess income tax benefits from exercise of stock options as an operating activity on the consolidated statement of cash flows. The Company elected to adopt this amendment retrospectively and the impact of the adoption on operating and financing cash flows was not material.

X

- References No definition available. + Details Name: us-gaap_AccountingPoliciesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details Name: us-gaap_SignificantAccountingPoliciesTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

ACQUISITIONS	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Faiveley Transport On November 30, 2016, the Company acquired majority ownership of Faiveley Transport S.A. (“Faiveley Transport”) under the terms of a Share Purchase Agreement (“Share Purchase Agreement”). Faiveley Transport is a leading global provider of value-added, integrated systems and services for the railway industry with annual sales of about $1.2 billion and more than 5,700 employees in 24 countries. Faiveley Transport supplies railway manufacturers, operators and maintenance providers with a range of value-added, technology-based systems and services in Energy & Comfort (air conditioning, power collectors and converters, and passenger information), Access & Mobility (passenger access systems and platform doors), and Brakes and Safety (braking systems and couplers). The transaction was structured as a step acquisition as follows: • On November 30, 2016, the Company acquired majority ownership of Faiveley Transport, after completing the purchase of the Faiveley family’s ownership interest under the terms of the Share Purchase Agreement, which directed the Company to pay €100 per share of Faiveley Transport, payable between 25% and 45% in cash at the election of those shareholders and the remainder payable in Wabtec stock. The Faiveley family’s ownership interest acquired by the Company represented approximately 51% of outstanding share capital and approximately 49% of the outstanding voting shares of Faiveley Transport. Upon completion of the share purchase under the Share Purchase Agreement, Wabtec commenced a tender offer for the remaining publicly traded Faiveley Transport shares. The public shareholders had the option to elect to receive €100 per share in cash or 1.1538 shares of Wabtec common stock per share of Faiveley Transport. The common stock portion of the consideration was subject to a cap on issuance of Wabtec common shares that was equivalent to the rates of cash and stock elected by the 51% owners. • On February 3, 2017, the initial cash tender offer was closed, which resulted in the Company acquiring approximately 27% of additional outstanding share capital and voting rights of Faiveley Transport for approximately $411.8 million in cash and $25.2 million in Wabtec stock. After the initial cash tender offer, the Company owned approximately 78% of outstanding share capital and 76% of voting rights. • On March 6, 2017, the final cash tender offer was closed, which resulted in the Company acquiring approximately 21% of additional outstanding share capital and 22% of additional outstanding voting rights of Faiveley Transport for approximately $303.2 million in cash and $0.3 million in Wabtec stock. After the final cash tender offer, the Company owned approximately 99% of the share capital and 98% of the voting rights of Faiveley Transport. • On March 21, 2017, a mandatory squeeze-out procedure was finalized, which resulted in the Company acquiring the Faiveley Transport shares not tendered in the offers for approximately $17.5 million in cash. This resulted in the Company owning 100% of the share capital and voting rights of Faiveley Transport. As of November 30, 2016, the date the Company acquired 51% of the share capital and 49% of the voting interest in Faiveley Transport, Faiveley Transport was consolidated under the variable interest entity model as the Company concluded that it was the primary beneficiary of Faiveley Transport as it then possessed the power to direct the activities of Faiveley Transport that most significantly impact its economic performance and it then possessed the obligation and right to absorb losses and benefits from Faiveley Transport. The purchase price paid for 100% ownership of Faiveley Transport was $1,507 million. The $744.7 million included as deposits in escrow on the consolidated balance sheet at December 31, 2016 was cash designated for use as consideration for the tender offers. The fair values of the assets acquired and liabilities assumed were determined using the income, cost and market approaches. The fair value measurements were primarily based on significant inputs that are not observable in the market and are considered Level 3. The December 31, 2016 consolidated balance sheet includes the assets and liabilities of Faiveley Transport, which have been measured at fair value. The fair value of the noncontrolling interest was preliminarily determined using the market price of Faiveley Transport’s publicly traded common stock multiplied by the number of publicly traded common shares outstanding at the acquisition date and is considered Level 1. The acquisition of the noncontrolling interest during the three months ended March 31, 2017 resulted in a $8.9 million increase to additional paid-in capital on the consolidated balance sheet which represents the difference in consideration paid to acquire the noncontrolling interest and the carrying value of noncontrolling interest at acquisition. The following table summarizes the final fair values of the Faiveley Transport assets acquired and liabilities assumed. In thousands     Assets acquired     Cash and cash equivalents   $ 178,318 Accounts receivable   439,631 Inventories   205,649 Other current assets   70,930 Property, plant, and equipment   148,746 Goodwill   1,262,350 Trade names   346,328 Customer Relationships   233,529 Patents   1,201 Other noncurrent assets   184,564 Total assets acquired   3,071,246 Liabilities assumed     Current liabilities   819,493 Debt   409,899 Other noncurrent liabilities   335,039 Total liabilities assumed   1,564,431 Net assets acquired $ 1,506,815 During the twelve months ended December 31, 2017, the estimated fair values for customer relationships and current liabilities were adjusted by $21.8 million and $65.3 million, respectively, for changes to initial estimates based on information that existed at the date of acquisition. Additionally, the estimated fair values for accounts receivable and current liabilities were adjusted by $2.8 million and $36.2 million, respectively, to correct errors in the preliminary estimated fair values of the Faiveley Transport assets acquired and liabilities assumed. Other noncurrent assets were adjusted by $30.0 million to record the deferred tax impact of these adjustments. As a result of these adjustments and other immaterial adjustments related to changes to initial estimates based on information that existed at the date of acquisition, goodwill increased by $74.1 million. Accounts receivable and current liabilities were adjusted by $64.3 million to correct an error in the preliminary estimated fair values of Faiveley Transport assets and liabilities assumed related to a factoring arrangement with recourse. Substantially all of the accounts receivable acquired are expected to be collectible. Included in current liabilities is $25.9 million of accrued compensation for acquired share-based stock plans that are obligated to be settled in cash. Contingent liabilities assumed as part of the transaction were not material. These contingent liabilities are related to environmental, legal and tax matters. Contingent liabilities are recorded at fair value in purchase accounting, aside from those pertaining to uncertainty in income taxes which are an exception to the fair value basis of accounting. Goodwill was calculated as the difference between the acquisition date fair value of the consideration transferred and the fair value of the net assets acquired, and represents the future economic benefits, including synergies and assembled workforce, that we expect to achieve as a result of the acquisition. Purchased goodwill is not deductible for tax purposes. The goodwill allocated to the Freight segment is $72.0 million and the goodwill allocated to the Transit segment is $1,190.4 million. Other Acquisitions The Company made the following acquisitions operating as a business unit or component of a business unit in the Freight Segment: • On December 4, 2017, the Company acquired Melett Limited ("Melett"), a leader in the design, manufacture, and supply of high-quality turbochargers and replacement parts to the turbocharger aftermarket, for a purchase price of approximately $74.0 million, net of cash acquired, resulting in preliminary goodwill of $22.5 million, none of which will be deductible for tax purposes. • On April 5, 2017, the Company acquired Thermal Transfer Corporation ("TTC"), a leading provider of heat transfer solutions for industrial applications, for a purchase price of approximately $32.5 million, net of cash acquired, resulting in preliminary goodwill of $16.3 million, all of which will be deductible for tax purposes. • On March 13, 2017, the Company acquired Aero Transportation Products ("ATP"), a manufacturer of engineered covering systems for hopper freight cars, for a purchase price of approximately $65.3 million, net of cash acquired, resulting in preliminary goodwill of $29.0 million, all of which will be deductible for tax purposes. • On December 14, 2016, the Company acquired Workhorse Rail LLC ("Workhorse"), a supplier of engineered freight car components, mainly for the aftermarket for a purchase price of approximately $43.8 million, net of cash acquired, resulting in goodwill of $22.3 million, 38% of which will be deductible for tax purposes. • On November 17, 2016, the Company acquired the assets of Precision Turbo & Engine ("Precision Turbo"), a designer and manufacturer of high-performance, aftermarket turbochargers, wastegates, and heat exchangers for the automotive performance market for a purchase price of approximately $13.9 million, net of cash acquired, resulting in goodwill of $4.2 million, all of which will be deductible for tax purposes. • On May 5, 2016, the Company acquired the assets of Unitrac Railroad Materials ("Unitrac"), a leading designer and manufacturer of railroad products and track work services for a purchase price of approximately $14.8 million, net of cash acquired, resulting in goodwill of $2.4 million, all of which will be deductible for tax purposes. For the Melett, TTC, and ATP acquisitions, the following table summarizes the preliminary estimated fair values of the assets acquired and liabilities assumed at the date of the acquisitions.  For the Workhorse, Precision Turbo, and Unitrac acquisitions, the following table summarizes the final fair value of assets acquired and liabilities assumed at the date of acquisition.       Melett   TTC   ATP   Workhorse   Precision Turbo   Unitrac     December 4, 2017   April 5, 2017   March 13, 2017   December 14, 2016   November 17, 2016   May 5, 2016 In thousands             Current assets   $ 21,068   $ 3,746   $ 11,666   $ 9,137   $ 4,145   $ 11,476 Property, plant & equipment   5,917   5,909   5,354   —   1,317   1,768 Goodwill   22,501   16,309   29,034   22,273   4,248   2,442 Other intangible assets   39,259   12,300   25,000   21,500   5,200   1,230 Total assets acquired   88,745   38,264   71,054   52,910   14,910   16,916 Total liabilities assumed   (14,789 )   (5,753 )   (5,800 )   (9,083 )   (1,057 )   (2,145 ) Net assets acquired   $ 73,956   $ 32,511   $ 65,254   $ 43,827   $ 13,853   $ 14,771 The Company made the following acquisitions operating as a business unit or component of a business unit in the Transit Segment: • On October 2, 2017, the Company acquired AM General Contractor ("AM General"), a manufacturer of safety systems, mainly for transit rail cars for a purchase price of approximately $10.4 million, net of cash acquired, resulting in preliminary goodwill of $12.9 million, none of which will be deductible for tax purposes. • On August 1, 2016, the Company acquired Gerken Group S.A. ("Gerken"), a manufacturer of specialty carbon and graphite products for rail and other industrial applications, for a purchase price of approximately $62.8 million, net of cash acquired, resulting in goodwill of $17.5 million, none of which will be deductible for tax purposes.  For the AM General acquisition, the following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition. For the Gerken acquisition, the following table summarizes the final fair value of the assets acquired and liabilities assumed at the date of the acquisition.       AM General   Gerken     October 2, 2017   August 1, 2016 In thousands     Current assets   $ 6,611   $ 32,706 Property, plant & equipment   4,140   7,667 Goodwill   12,943   17,470 Other intangible assets   12,097   30,560 Other assets —   1,706 Total assets acquired   35,791   90,109 Total liabilities assumed (25,375 )   (27,262 ) Net assets acquired   $ 10,416   $ 62,847 The acquisitions listed above include escrow deposits of $44.4 million, which may be released to the Company for indemnity and other claims in accordance with the purchase and escrow agreements.   The total goodwill and other intangible assets for acquisitions listed in the tables above was $2,117.8 million, of which $1,389.6 million and $728.2 million was related to goodwill and other intangible assets, respectively.  Of the allocation of $728.2 million of acquired intangible assets, $380.9 million was assigned to trade names, $336.9 million was assigned to customer relationships, and $5.0 million was assigned to intellectual property. The trade names are considered to have an indefinite useful life while the intellectual property and customer relationships’ useful life is 20 years. The Company also made smaller acquisitions not listed above which are individually and collectively immaterial. The following unaudited pro forma financial information presents income statement results as if the acquisitions listed above had occurred January 1, 2016:       For the year ended December 31, In thousands   2017   2016 Net sales   $ 3,946,244   $ 4,212,617 Gross profit   1,095,101   1,275,835 Net income attributable to Wabtec shareholders   271,783   349,852 Diluted earnings per share         As Reported   $ 2.72   $ 3.34 Pro forma   $ 2.82   $ 3.83   The historical consolidated financial information of the Company and the acquisitions detailed above have been adjusted in the pro forma information to give effect to pro forma events that are (1) directly attributable to the transactions, (2) factually supportable and (3) expected to have a continuing impact on the combined results. Pro forma data may not be indicative of the results that would have been obtained had these acquisitions occurred at the beginning of the periods presented, nor is it intended to be a projection of future results.

X

- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details Name: us-gaap_BusinessCombinationDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_BusinessCombinationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

SUPPLEMENTAL CASH FLOW DISCLOSURES	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
SUPPLEMENTAL CASH FLOW DISCLOSURES	SUPPLEMENTAL CASH FLOW DISCLOSURES     Year Ended December 31,     2017   2016   2015 In thousands             Interest paid during the year   $ 75,317   $ 30,211   $ 19,372 Income taxes paid during the year, net of amount refunded   $ 89,379   $ 121,563   $ 147,958 Business acquisitions:             Fair value of assets acquired   452,209   3,118,420   156,020 Liabilities assumed   207,788   1,453,382   20,789 Non-controlling interest (acquired) assumed   (738,024 )   760,343   — Stock and cash paid   982,445   904,695   135,231 Less: Cash acquired   35,408   186,903   5,681           Stock used for acquisition   25,500   534,679   — Net cash paid   $ 921,537   $ 183,113   $ 129,550

X

- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details Name: us-gaap_CashFlowSupplementalDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_SupplementalCashFlowElementsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

INVENTORIES	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES The components of inventory, net of reserves, were:       December 31, In thousands   2017   2016 Raw materials   $ 378,481   $ 331,465 Work-in-progress   167,390   145,462 Finished goods   196,763   181,583 Total inventories   $ 742,634   $ 658,510

X

- References No definition available. + Details Name: us-gaap_InventoryDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details Name: us-gaap_InventoryDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

PROPERTY, PLANT & EQUIPMENT	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT & EQUIPMENT	PROPERTY, PLANT & EQUIPMENT The major classes of depreciable assets are as follows:     December 31, In thousands   2017   2016 Machinery and equipment   $ 728,257   $ 645,354 Buildings and improvements   259,561   225,307 Land and improvements   38,228   41,569 Property, plant and equipment   1,026,046   912,230 Less: accumulated depreciation   (452,074 )   (393,854 ) Total   $ 573,972   $ 518,376   The estimated useful lives of property, plant and equipment are as follows:   Years Land improvements 10 to 20 Building and improvements 20 to 40 Machinery and equipment 3 to 15   Depreciation expense was $66.7 million, $47.1 million, and $43.1 million for 2017, 2016 and 2015, respectively.

X

- References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details Name: us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

INTANGIBLES	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLES	INTANGIBLES Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles with definite lives are amortized on a straight-line basis over their estimated economic lives. Goodwill and indefinite lived intangible assets are reviewed annually during the fourth quarter for impairment (See Note 2 “Summary of Significant Accounting Policies” included herein). Goodwill and indefinite live intangible assets were not impaired at December 31, 2017 and 2016. The change in the carrying amount of goodwill by segment for the year ended December 31, 2017 is as follows:     Freight   Transit     In thousands   Segment   Segment   Total Balance at December 31, 2016   $ 550,902   $ 1,527,863   $ 2,078,765 Additions   152,096   34,391   186,487 Foreign currency impact   15,960   178,891   194,851 Balance at December 31, 2017   $ 718,958   $ 1,741,145   $ 2,460,103 As of December 31, 2017 and 2016, the Company’s trade names had a net carrying amount of $603.4 million and $510.5 million, respectively, and the Company believes these intangibles have indefinite lives. Intangible assets of the Company, other than goodwill and trade names, consist of the following:     December 31, In thousands   2017   2016 Patents, non-compete and other intangibles, net of accumulated         amortization of $43,021 and $40,638   $ 17,554   $ 15,360 Customer relationships, net of accumulated amortization         of $126,824 and $87,334   583,459   528,068 Total   $ 601,013   $ 543,428 The remaining weighted average useful lives of patents, customer relationships and intellectual property were 10 years, 17 years and 15 years respectively. Amortization expense for intangible assets was $36.5 million, $22.7 million, and $21.7 million for the years ended December 31, 2017, 2016, and 2015, respectively. Estimated amortization expense for the five succeeding years is as follows (in thousands): 2018 $ 38,059 2019 36,076 2020 34,050 2021 33,777 2022 33,489

X

- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

LONG-TERM DEBT	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Long-term debt consisted of the following:     December 31, In thousands   2017   2016 3.45% Senior Notes due 2026, net of unamortized debt issuance costs of $2,345 and $2,526   $ 747,655   $ 747,474 4.375% Senior Notes due 2023, net of unamortized discount and debt issuance costs of $1,433 and $1,690   248,567   248,310 Revolving Credit Facility and Term Loan, net of unamortized debt issuance costs of $2,451 and $3,850   853,124   796,150 Schuldschein Loan   11,998   98,671 Other Borrowings   6,860   1,153 Capital Leases   2,324   1,018 Total   1,870,528   1,892,776 Less - current portion   47,225   129,809 Long-term portion   $ 1,823,303   $ 1,762,967   Wabtec's acquisition of the controlling stake of Faiveley Transport triggered the early repayment of a syndicated loan and the mandatory offer to investors to repay the US and Schuldschein private placements. Both the syndicated loan and US private placements were repaid in full in December 2016. 3.45% Senior Notes Due November 2026 In October 2016, the Company issued $750.0 million of Senior Notes due in 2026 (the “2016 Notes”).  The 2016 Notes were issued at 99.965% of face value.  Interest on the 2016 Notes accrues at a rate of 3.45% per annum and is payable semi-annually on May 15 and November 15 of each year.  The proceeds were used to finance the cash portion of the Faiveley Transport acquisition, refinance Faiveley Transport’s indebtedness, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.7 million of deferred financing costs related to the issuance of the 2016 Notes.   The 2016 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2016 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens. The Company is in compliance with the restrictions and covenants in the indenture under which the 2016 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities. 4.375% Senior Notes Due August 2023 In August 2013, the Company issued $250.0 million of Senior Notes due in 2023 (the “2013 Notes”).  The 2013 Notes were issued at 99.879% of face value.  Interest on the 2013 Notes accrues at a rate of 4.375% per annum and is payable semi-annually on February 15 and August 15 of each year.  The proceeds were used to repay debt outstanding under the Company’s existing credit agreement, and for general corporate purposes.  The principal balance is due in full at maturity.  The Company incurred $2.6 million of deferred financing costs related to the issuance of the 2013 Notes.   The 2013 Notes are senior unsecured obligations of the Company and rank pari passu with all existing and future senior debt and senior to all existing and future subordinated indebtedness of the Company. The indenture under which the 2013 Notes were issued contains covenants and restrictions which limit among other things, the following: the incurrence of indebtedness, payment of dividends and certain distributions, sale of assets, change in control, mergers and consolidations and the incurrence of liens. The Company is in compliance with the restrictions and covenants in the indenture under which the 2013 Notes were issued and expects that these restrictions and covenants will not be any type of limiting factor in executing our operating activities. 2016 Refinancing Credit Agreement On June 22, 2016, the Company amended its existing revolving credit facility with a consortium of commercial banks. This “2016 Refinancing Credit Agreement” provides the Company with a $1.2 billion, 5 year revolving credit facility and a $400.0 million delayed draw term loan (the “Term Loan”). The Company incurred approximately $3.3 million of deferred financing cost related to the 2016 Refinancing Credit Agreement. The facility expires on June 22, 2021. The 2016 Refinancing Credit Agreement borrowings bear variable interest rates indexed as described below. At December 31, 2017, the Company had available bank borrowing capacity, net of $35.4 million of letters of credit, of approximately $679.0 million, subject to certain financial covenant restrictions. The Term Loan was drawn on November 25, 2016. The Company incurred a 10 basis point commitment fee from June 22, 2016 until the initial draw on November 25, 2016. Under the 2016 Refinancing Credit Agreement, the Company may elect a Base Rate of interest for U.S. Dollar denominated loans or, for certain currencies, an interest rate based on the London Interbank Offered Rate (“LIBOR”) of interest, or other rates appropriate for such currencies (in any case, “the Alternate Rate”). The Base Rate adjusts on a daily basis and is the greater of the Federal Funds Effective Rate plus 0.50% per annum, the PNC, N.A. prime rate or the Daily LIBOR Rate plus 100 basis points, plus a margin that ranges from 0 to 75 basis points. The Alternate Rate is based on the quoted rates specific to the applicable currency, plus a margin that ranges from 75 to 175 basis points. Both the Base Rate and Alternate Rate margins are dependent on the Company’s consolidated total indebtedness to EBITDA ratios. The initial Base Rate margin is 0 basis points and the Alternate Rate margin is 175 basis points. At December 31, 2017, the weighted average interest rate on the Company’s variable rate debt was 2.92%.  On January 12, 2012, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million. The effective date of the interest rate swap agreement is July 31, 2013, and the termination date was November 7, 2016. The impact of the interest rate swap agreement converted a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing. During the term of the interest rate swap agreement the interest rate on the notional value was fixed at 1.415% plus the Alternate Rate margin. On June 5, 2014, the Company entered into a forward starting interest rate swap agreement with a notional value of $150.0 million.  The effective date of the interest rate swap agreement is November 7, 2016, and the termination date is December 19, 2018.  The impact of the interest rate swap agreement converts a portion of the Company’s outstanding debt from a variable rate to a fixed-rate borrowing.  During the term of the interest rate swap agreement the interest rate on the notional value will be fixed at 2.56% plus the Alternate Rate margin.  As for these agreements, the Company is exposed to credit risk in the event of nonperformance by the counterparties.  However, since only the cash interest payments are exchanged, exposure is significantly less than the notional amount.  The counterparties are large financial institutions with excellent credit ratings and history of performance.  The Company currently believes the risk of nonperformance is negligible. The 2016 Refinancing Credit Agreement limits the Company’s ability to declare or pay cash dividends and prohibits the Company from declaring or making other distributions, subject to certain exceptions. The 2016 Refinancing Credit Agreement contains various other covenants and restrictions including the following limitations: incurrence of additional indebtedness; mergers, consolidations, sales of assets and acquisitions; additional liens; sale and leasebacks; permissible investments, loans and advances; certain debt payments; and imposes a minimum interest expense coverage ratio of 3.0 and a maximum debt to EBITDA ratio of 3.25. The Company is in compliance with the restrictions and covenants of the 2016 Refinancing Credit Agreement and does not expect that these measurements will limit the Company in executing our operating activities. Schuldschein Loan, Due 2016 In conjunction with the acquisition of Faiveley Transport, Wabtec acquired $137.2 million of a Schuldshein private placement loan which was originally issued by Faiveley Transport on March 5, 2014 in Germany, in which approximately 20 international investors participated. This loan is denominated in euros. Subsequent to the acquisition of Faiveley Transport, the Company repaid $125.3 million of the outstanding Schuldschein loan. The remaining balance of $12.0 million as of December 31, 2017 matures on March 5, 2024 and bears a fixed rate of 4.00%. Debt and Capital Leases Scheduled principal repayments of debt and capital lease balances as of December 31, 2017 are as follows:       2018 $ 47,225 2019 330,901 2020 559 2021 483,379 2022 208 Future years 1,008,256 Total $ 1,870,528

X

- Definition The entire disclosure for debt and capital lease obligations can be reported. Information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. Also includes descriptions and amounts of capital leasing arrangements that consist of direct financing, sales type and leveraged leases. Disclosure may include the effect on the balance sheet and the income statement resulting from a change in lease classification for leases that at inception would have been classified differently had guidance been in effect at the inception of the original lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details Name: us-gaap_DebtAndCapitalLeasesDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_DebtDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Defined Benefit Pension Plans The Company sponsors defined benefit pension plans that cover certain U.S., Canadian, German, and United Kingdom employees and which provide benefits of stated amounts for each year of service of the employee. The Company uses a December 31 measurement date for the plans. The following tables provide information regarding the Company’s defined benefit pension plans summarized by U.S. and international components. Obligations and Funded Status     U.S.   International In thousands   2017   2016   2017   2016 Change in projected benefit obligation                 Obligation at beginning of year   $ (45,512 )   $ (46,120 )   $ (319,551 )   $ (195,311 ) Opening balance sheet adjustment   —   —   (5,321 )   — Service cost   (344 )   (337 )   (2,740 )   (1,379 ) Interest cost   (1,422 )   (1,475 )   (7,310 )   (5,774 ) Employee contributions   —   —   (880 )   (195 ) Plan curtailments and amendments   —   —   4,153   2,061 Benefits paid   3,079   3,893   12,906   9,427 Acquisition   —   —   —   (114,242 ) Actuarial gain (loss)   (14 )   (1,473 )   (3,009 )   (33,330 ) Effect of currency rate changes   —   —   (31,265 )   19,192 Obligation at end of year   $ (44,213 )   $ (45,512 )   $ (353,017 )   $ (319,551 ) Change in plan assets                 Fair value of plan assets at beginning of year   $ 35,802   $ 37,640   $ 241,283   $ 168,069 Opening balance sheet adjustment   —   —   2,058   — Actual return on plan assets   4,223   2,055   19,102   20,066 Employer contributions   486   —   13,479   6,933 Employee contributions   —   —   880   195 Benefits paid   (3,079 )   (3,893 )   (12,905 )   (9,427 ) Acquisition   —   —   —   70,519 Settlements           (4,523 )     Effect of currency rate changes   —   —   22,228   (15,072 ) Fair value of plan assets at end of year   $ 37,432   $ 35,802   $ 281,602   $ 241,283 Funded status                 Fair value of plan assets   $ 37,432   $ 35,802   $ 281,602   $ 241,283 Benefit obligations   (44,213 )   (45,512 )   (353,017 )   (319,551 ) Funded status   $ (6,781 )   $ (9,710 )   $ (71,415 )   $ (78,268 ) Amounts recognized in the statement of financial position consist of:                 Noncurrent assets   $ —   $ —   $ 10,577   $ 7,130 Current liabilities   —   —   (2,158 )   (2,042 ) Noncurrent liabilities   (6,781 )   (9,710 )   (79,834 )   (83,356 ) Net amount recognized   $ (6,781 )   $ (9,710 )   $ (71,415 )   $ (78,268 ) Amounts recognized in accumulated other comprehensive income (loss) consist of:                 Prior service cost   (6 )   (8 )   (32 )   (56 ) Net actuarial loss   (20,418 )   (23,884 )   (54,043 )   (56,411 ) Net amount recognized   $ (20,424 )   $ (23,892 )   $ (54,075 )   $ (56,467 )  The aggregate accumulated benefit obligation for the U.S. pension plans was $43.3 million and $44.5 million as of December 31, 2017 and 2016, respectively. The aggregate accumulated benefit obligation for the international pension plans was $344.3 million and $312.2 million as of December 31, 2017 and 2016, respectively.     U.S.   International In thousands   2017   2016   2017   2016 Information for pension plans with accumulated benefit obligations in                 excess of Plan assets:                 Projected benefit obligation   $ (44,213 )   $ (45,512 )   $ (282,077 )   $ (255,682 ) Accumulated benefit obligation   (43,340 )   (44,530 )   (274,557 )   (249,729 ) Fair value of plan assets   37,432   35,802   200,218   170,367 Information for pension plans with projected benefit obligations in                 excess of plan assets:                 Projected benefit obligation   $ (44,213 )   $ (45,512 )   $ (283,106 )   $ (256,530 ) Fair value of plan assets   37,432   35,802   201,115   171,133   Components of Net Periodic Benefit Costs     U.S.   International In thousands   2017   2016   2015   2017   2016   2015 Service cost   $ 344   $ 337   $ 381   $ 2,740   $ 1,379   $ 2,015 Interest cost   1,422   1,475   1,914   7,310   5,774   7,091 Expected return on plan assets   (1,731 )   (2,076 )   (2,168 )   (12,412 )   (9,971 )   (9,591 ) Amortization of initial net obligation and prior service cost   3   3   3   27   61   212 Amortization of net loss   989   914   1,062   2,846   1,818   2,379 Settlement and curtailment losses recognized   —   —   —   768   218   — Net periodic benefit cost   $ 1,027   $ 653   $ 1,192   $ 1,279   $ (721 )   $ 2,106   Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows: In thousands   U.S.   International Net gain (loss) arising during the year   $ 2,477   $ 3,683 Effect of exchange rates   —   (4,945 ) Amortization, settlement, or curtailment recognition of net transition obligation   —   768 Amortization or curtailment recognition of prior service cost   3   27 Amortization or settlement recognition of net loss   989   2,846 Total recognized in other comprehensive gain   $ 3,469   $ 2,379 Total recognized in net periodic benefit cost and other comprehensive gain   $ 2,442   $ 1,100 The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed.     U.S.   International     2017   2016   2015   2017   2016   2015 Discount rate   3.56 %   3.95 %   4.21 %   2.40 %   2.51 %   3.56 % Expected return on plan assets   4.95 %   5.70 %   5.70 %   5.02 %   6.07 %   5.81 % Rate of compensation increase   3.00 %   3.00 %   3.00 %   2.54 %   2.54 %   3.10 % The discount rate is based on settling the pension obligation with high grade, high yield corporate bonds, and the rate of compensation increase is based on actual experience. The expected return on plan assets is based on historical performance as well as expected future rates of return on plan assets considering the current investment portfolio mix and the long-term investment strategy. As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018. In thousands   U.S.   International Prior service cost   3   22 Net actuarial loss   970   2,193     $ 973   $ 2,215  Pension Plan Assets The Company has established formal investment policies for the assets associated with our pension plans. Objectives include maximizing long-term return at acceptable risk levels and diversifying among asset classes. Asset allocation targets are based on periodic asset liability study results which help determine the appropriate investment strategies. The investment policies permit variances from the targets within certain parameters. The plan assets consist primarily of equity security funds, debt security funds, and temporary cash and cash equivalent investments. The assets held in these funds are generally actively managed and are valued at the net asset value per share multiplied by the number of shares held as of the measurement date. (See Note 18 “Fair Value Measurement” included herein). Plan assets by asset category at December 31, 2017 and 2016 are as follows:     U.S.   International In thousands   2017   2016   2017   2016 Pension Plan Assets                 Equity security funds   $ 18,122   $ 17,446   $ 100,453   $ 92,201 Debt security funds and other   18,304   17,038   178,730   145,003 Cash and cash equivalents   1,006   1,318   2,419   4,079 Fair value of plan assets   $ 37,432   $ 35,802   $ 281,602   $ 241,283 The U.S. plan has a target asset allocation of 55% equity securities and 45% debt securities. The International plan has a target asset allocation of 30% equity securities, 40% debt securities and 30% in other investments. Investment policies are determined by the respective Plan’s Pension Committee and set forth in its Investment Policy. Rebalancing of the asset allocation occurs on a quarterly basis. The following tables summarize our pension plan assets measured at fair value on a recurring basis by fair value hierarchy level (See Note 18):     December 31, 2017 In thousands   NAV   Level 1   Level 2   Level 3   Total US:                     Equity   $ —   $ 18,122   $ —   $ —   $ 18,122 Debt Securities   —   4,273   14,031   —   18,304 Cash and cash equivalents   —   1,006   —   —   1,006 International:                     Equity   $ 4,586   $ 38,647   $ 95,641   $ —   $ 138,874 Debt Securities   —   —   111,204   —   111,204 Insurance Contracts   —   —   15,893   13,123   29,016 Cash and cash equivalents   —   2,507   —   —   2,507 Total   $ 4,586   $ 64,555   $ 236,769   $ 13,123   $ 319,033     December 31, 2016 In thousands   NAV   Level 1   Level 2   Level 3   Total US:                     Equity   $ —   $ 17,446   $ —   $ —   $ 17,446 Debt Securities   —   4,766   12,272   —   17,038 Cash and cash equivalents   —   1,318   —   —   1,318 International:                     Equity   $ 3,589   $ 38,053   $ 78,694   $ —   $ 120,336 Debt Securities   —   —   90,508   —   90,508 Insurance Contracts   —   —   13,037   12,996   26,033 Cash and cash equivalents   —   4,406   —   —   4,406 Total   $ 3,589   $ 65,989   $ 194,511   $ 12,996   $ 277,085 The following table presents a reconciliation of Level 3 assets: In thousands   Total Balance at December 31, 2015   $ — Net purchases, issuances, and settlements   56 Net realized and unrealized gains (losses) included in earnings   (5 ) Business acquisition   12,949 Other   (4 ) Balance at December 31, 2016   $ 12,996 Net purchases, issuances, and settlements   778 Net realized and unrealized gains (losses) included in earnings   375 Opening balance sheet adjustment   (1,308 ) Other   282 Balance at December 31, 2017   $ 13,123   Cash Flows The Company’s funding methods are based on governmental requirements and differ from those methods used to recognize pension expense. The Company expects to contribute $7.3 million and $0.0 million to the international and U.S. plans, respectively, during 2018. Benefit payments expected to be paid to plan participants are as follows: In thousands   U.S.   International Year ended December 31,         2018   $ 3,250   $ 12,401 2019   3,301   12,403 2020   3,325   13,156 2021   3,160   13,799 2022   3,125   14,538 2023 through 2027   14,276   77,817 Postretirement Benefit Plans In addition to providing pension benefits, the Company has provided certain unfunded postretirement health care and life insurance benefits for a portion of North American employees. The Company is not obligated to pay health care and life insurance benefits to individuals who had retired prior to 1990. The Company uses a December 31 measurement date for all postretirement plans. The following tables provide information regarding the Company’s post retirement benefit plans summarized by U.S. and international components. Obligations and Funded Status     U.S.   International In thousands   2017   2016   2017   2016 Change in projected benefit obligation                 Obligation at beginning of year   $ (11,876 )   $ (12,959 )   $ (3,425 )   $ (3,290 ) Service cost   (5 )   (4 )   (28 )   (29 ) Interest cost   (350 )   (389 )   (98 )   (99 ) Plan amendments   —   6   —   — Benefits paid   970   720   199   133 Acquisition —   (143 )   —   — Actuarial gain (loss)   (84 )   893   (131 )   (42 ) Effect of currency rate changes   —   —   (237 )   (98 ) Obligation at end of year   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,425 ) Change in plan assets                 Fair value of plan assets at beginning of year   $ —   $ —   $ —   $ — Employer contributions   970   720   199   133 Benefits paid   (970 )   (720 )   (199 )   (133 ) Fair value of plan assets at end of year   $ —   $ —   $ —   $ — Funded status                 Fair value of plan assets   $ —   $ —   $ —   $ — Benefit obligations   (11,345 )   (11,876 )   (3,720 )   (3,425 ) Funded status   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,425 )     U.S.   International In thousands   2017   2016   2017   2016 Amounts recognized in the statement of financial position consist of:                 Current liabilities   $ (1,046 )   $ (1,084 )   $ (208 )   $ (185 ) Noncurrent liabilities   (10,299 )   (10,792 )   (3,512 )   (3,160 ) Net amount recognized   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,345 ) Amounts recognized in accumulated other comprehensive income (loss)                 consist of:                 Prior service credit   19,616   21,134   9   15 Net actuarial (loss) gain   (18,882 )   (20,023 )   154   292 Net amount recognized   $ 734   $ 1,111   $ 163   $ 307 Components of Net Periodic Benefit Cost     U.S.   International In thousands   2017   2016   2015   2017   2016   2015 Service cost   $ 5   $ 4   $ 9   $ 28   $ 29   $ 38 Interest cost   350   389   1,233   98   99   128 Amortization of initial net obligation and prior service cost   (1,519 )   (1,709 )   (2,295 )   (7 )   (7 )   (7 ) Amortization of net loss (gain)   1,225   1,287   1,356   (23 )   (29 )   (30 ) Net periodic benefit cost (credit)   $ 61   $ (29 )   $ 303   $ 96   $ 92   $ 129   Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows: In thousands   U.S.   International Net loss arising during the year   (84 )   (131 ) Effect of exchange rates   —   16 Amortization or curtailment recognition of prior service cost   (1,519 )   (7 ) Amortization or settlement recognition of net loss (gain)   1,225   (23 ) Total recognized in other comprehensive income (loss)   $ (378 )   $ (145 ) Total recognized in net periodic benefit cost and other comprehensive income (loss)   $ (317 )   $ (53 ) The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed and also the net periodic benefit cost for the following year. The discount rate is based on settling the pension obligation with high grade, high yield corporate bonds.     U.S.   International     2017   2016   2015   2017   2016   2015 Discount rate   3.43 %   3.76 %   3.95 %   3.21 %   3.46 %   3.80 % As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018. In thousands   U.S.   International Prior service credit   (1,519 )   (7 ) Net actuarial loss (gain)   1,216   (8 )     $ (303 )   $ (15 ) The assumed health care cost trend rate for the U.S. plans grades from an initial rate of 6.30% to an ultimate rate of 4.50% by 2027 and for international plans from 6.23% to 4.50% by 2027. A 1.0% increase in the assumed health care cost trend rate will increase the service and interest cost components of the expense recognized for the U.S. and international post-retirement plans by less than $0.1 million for 2017, and increase the accumulated post-retirement benefit obligation by less than $0.1 million and $0.3 million, respectively. A 1.0% decrease in the assumed health care cost trend rate will decrease the service and interest cost components of the expense recognized for the U.S. and international post-retirement plans by less than $0.1 million for 2017, and decrease the accumulated post-retirement benefit obligation by less than $0.1 million and $0.3 million, respectively. Cash Flows Benefit payments expected to be paid to plan participants are as follows: In thousands   U.S.   International Year ended December 31,         2018   $ 1,046   $ 208 2019   1,024   220 2020   986   225 2021   950   245 2022   908   251 2023 through 2027   3,956   1,352 Defined Contribution Plans The Company also participates in certain defined contribution plans and multiemployer pension plans. Costs recognized under these plans are summarized as follows:     For the year ended December 31, In thousands   2017   2016   2015 Multi-employer pension and health & welfare plans   $ 1,522   $ 2,054   $ 2,584 401(k) savings and other defined contribution plans   23,209   23,062   21,399 Total   $ 24,731   $ 25,116   $ 23,983 The 401(k) savings plan is a participant directed defined contribution plan that holds shares of the Company’s stock as one of the investment options. At December 31, 2017 and 2016, the plan held on behalf of its participants about 495,274 shares with a market value of $40.3 million, and 551,482 shares with a market value of $45.8 million, respectively. Additionally, the Company has stock option based benefit and other plans further described in Note 12. The Company contributes to several multi-employer defined benefit pension plans under collective bargaining agreements that cover certain of its union-represented employees. The risks of participating in such plans are different from the risks of single-employer plans. Assets contributed to a multi-employer plan by one employer may be used to provide benefits to employees of other participating employers. If a participating employer ceases to contribute to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. If the Company ceases to have an obligation to contribute to the multi-employer plan in which it had been a contributing employer, it may be required to pay to the plan an amount based on the underfunded status of the plan and on the history of the Company’s participation in the plan prior to the cessation of its obligation to contribute. The amount that an employer that has ceased to have an obligation to contribute to a multi-employer plan is required to pay to the plan is referred to as a withdrawal liability. The Company’s participation in multi-employer plans for the year ended December 31, 2017 is outlined in the table below. For plans that are not individually significant to the Company, the total amount of contributions is presented in the aggregate.           Pension Protection Act Zone Status (b)   FIP/   Contributions by the Company           Expiration Dates of                   RP Status Pending/                           Surcharge Imposed   Collective Bargaining Pension Fund   EIN/PN (a)   2016   2015   Implemented (c)   2017       2016       2015       (d)   Agreements Idaho Operating Engineers-   EIN # 91-6075538   Green   Green   No   $ 1,020   (1)   $ 1,306   (1 )   $ 1,820   (1 )   No   6/30/2018 Employers Pension Trust Fund   Plan# 001                                             Automobile Mechanics' Local No 701 Union and   EIN # 36-6042061   Yellow   Red   Yes (2)   $ 501   (3)   $ 748       $ 764       No (4)   6/1/2018 Industry Pension Plan   Plan # 001                                                               Total Contributions   $ 1,521       $ 2,054       $ 2,584               (1) The Company’s contribution represents more than 5% of the total contributions to the plan. (2) The Pension Fund’s board adopted a Funding Improvement Plan on October 21, 2015, continuing the existing plan which increased the weekly pension fund contribution rates by $75 with corresponding decreases to the weekly welfare fund contribution rates until December 31, 2017. (3) The number of employees covered by this fund decreased due to the closure of the Bensenville, Illinois facility, which affected the period-to-period comparability of 2016 and 2017 contributions. (4) Critical status triggered a 5% surcharge on employer contributions effective June 2012.  Effective January 1, 2013, this surcharge increases to 10%. The surcharge ended on October 21, 2015 when the rehabilitation plan commenced. (a) The “EIN / PN” column provides the Employer Identification Number and the three-digit plan number assigned to a plan by the Internal Revenue Service. (b) The most recent Pension Protection Act Zone Status available for 2017 and 2016 is for plan years that ended in 2016 and 2015, respectively. The zone status is based on information provided to the Company and other participating employers by each plan and is certified by the plan’s actuary. A plan in the “red” zone has been determined to be in “critical status”, based on criteria established under the Internal Revenue Code (“Code”), and is generally less than 65% funded. A plan in the “yellow” zone has been determined to be in “endangered status”, based on criteria established under the Code, and is generally less than 80% funded. A plan in the “green” zone has been determined to be neither in “critical status” nor in “endangered status”, and is generally at least 80% funded. (c) The “FIP/RP Status Pending/Implemented” column indicates whether a Funding Improvement Plan, as required under the Code to be adopted by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” zone, is pending or has been implemented as of the end of the plan year that ended in 2017. (d) The “Surcharge Imposed” column indicates whether the Company’s contribution rate for 2017 included an amount in addition the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical status”, in accordance with the requirements of the Code.

X

- References No definition available. + Details Name: us-gaap_CompensationAndRetirementDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details Name: us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

INCOME TAXES	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company is responsible for filing consolidated U.S., foreign and combined, unitary or separate state income tax returns. The Company is responsible for paying the taxes relating to such returns, including any subsequent adjustments resulting from the redetermination of such tax liabilities by the applicable taxing authorities. On December 23, 2017, the French government enacted the Finance Act for 2018 and it was published in the Official Bulletin on December 31, 2017. The Finance act reduced the French corporate tax rate from 28% in 2020 to 25%, enacting an additional 1.5% reduction in each year 2021 and 2022. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). The Tax Act makes broad and complex changes to the U.S. tax code that affect fiscal 2017, including, but not limited to requiring a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries that is payable over eight years (the "Transition Tax"). The Tax Act also establishes new tax laws that will affect 2018 and later years, including, but not limited to, a reduction of the U.S. federal corporate tax rate from 35% to 21%, repeals the Domestic Manufacturing Deduction, a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries, new provisions designed to tax global intangible low-taxed income ("GILTI"), tax certain deductible base erosion payments called base erosion and anti-abuse tax (“BEAT”), and new interest expense limitation provisions. In relation to the initial analysis of the impact of the all tax law changes, the Company has recorded a net tax expense of $4.3 million. This includes a provisional expense for the U.S. tax reform bill of $55.0 million, as well as a net benefit for the revaluation of deferred tax assets and liabilities of $50.7 million. The Company has not completed its accounting for the income tax effects of the Tax Act. Where the Company has been able to make reasonable estimates of the effects for which its analysis is not yet complete, the Company has recorded provisional amounts in accordance with SEC Staff Accounting Bulletin No. 118. Where the Company has not yet been able to make reasonable estimates of the impact of certain elements, the Company has not recorded any amounts related to those elements and has continued accounting for them in accordance with ASC 740 on the basis of the tax laws in effect immediately prior to the enactment of the Tax Act. The Company's accounting for the following impacted areas of the Tax Act is incomplete. However, the Company was able to make reasonable estimates of certain effects and, therefore, has recorded provisional amounts as follows: Revaluation of deferred tax assets and liabilities:    The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017. In addition, the Tax Act makes certain changes to the depreciation rules and implements new limits on the deductibility of certain executive compensation. The Company has evaluated these changes and has recorded a provisional benefit to net deferred taxes of $24.6 million. The Company is still completing its calculation of the impact of these changes on its deferred tax balances. Transition Tax on unrepatriated foreign earnings:    The Transition Tax on unrepatriated foreign earnings is a tax on previously untaxed accumulated and current earnings and profits ("E&P") of the Company's foreign subsidiaries. To determine the amount of the Transition Tax, the Company must determine, among other factors, the amount of post-1986 E&P of its foreign subsidiaries, as well as the amount of non-U.S. income taxes paid on such earnings. The Company was able to make a reasonable estimate of the Transition Tax and has recorded a provisional Transition Tax expense of $51.8 million. The Company is continuing to gather additional information to more precisely compute the amount of the Transition Tax to complete its calculation of E&P as well as the final determination of non-U.S. income taxes paid. The Company's accounting for the following elements of the Tax Act is incomplete, and it has not yet been able to make reasonable estimates of the effects of these items. Therefore, no provisional amounts were recorded. Global intangible low taxed income ("GILTI"):    The Tax Act creates a new requirement that certain income (i.e., GILTI) earned by foreign subsidiaries must be included currently in the gross income of the U.S. shareholder. Due to the complexity of the new GILTI tax rules, the Company is continuing to evaluate this provision of the Tax Act and the application of ASC 740. Under U.S. GAAP, the Company is permitted to make an accounting policy election to either treat taxes due on future inclusions in U.S. taxable income related to GILTI as a current-period expense when incurred or to factor such amounts into the Company's measurement of its deferred taxes. The Company has not yet completed its analysis of the GILTI tax rules and is not yet able to reasonably estimate the effect of this provision of the Tax Act or make an accounting policy election for the ASC 740 treatment of the GILTI tax. Therefore, the Company has not recorded any amounts related to potential GILTI tax in its financial statements and has not yet made a policy decision regarding whether to record deferred taxes on GILTI. Indefinite reinvestment assertion: Beginning in 2018, the Tax Act provides a 100% deduction for dividends received from 10-percent owned foreign corporations by U.S. corporate shareholders, subject to a one-year holding period. Although dividend income is now exempt from U.S. federal tax in the hands of the U.S. corporate shareholders, companies must still apply the guidance of ASC 740 to account for the tax consequences of outside basis differences and other tax impacts of their investments in non-U.S. subsidiaries. While the Company has accrued the Transition Tax on the deemed repatriated earnings that were previously indefinitely reinvested, the Company was unable to determine a reasonable estimate of the remaining tax liability, if any, under the Tax Act for its remaining outside basis differences or evaluate how the Tax Act will affect the Company's existing accounting position to indefinitely reinvest unremitted foreign earnings. Therefore, the Company has not included a provisional amount for this item in its financial statements for fiscal 2017. The Company will record amounts as needed for this item beginning in the first reporting period during the measurement period in which the Company obtains necessary information and is able to analyze and prepare a reasonable estimate. The components of the income from operations before provision for income taxes for the Company’s domestic and foreign operations for the years ended December 31 are provided below:     For the year ended December 31, In thousands   2017   2016   2015 Domestic   $ 140,325   $ 276,218   $ 461,394 Foreign   211,738   136,619   123,974 Income from operations before income taxes   $ 352,063   $ 412,837   $ 585,368 The consolidated provision for income taxes included in the Statement of Income consisted of the following:     For the year ended December 31, In thousands   2017   2016   2015 Current taxes             Federal   $ 86,157   $ 72,317   $ 141,245 State   3,644   9,953   16,072 Foreign   67,395   27,391   24,442     157,196   109,661   181,759 Deferred taxes             Federal   (22,863 )   11,013   9,606 State   (1,024 )   1,953   770 Foreign   (43,536 )   (23,194 )   (5,395 )     (67,423 )   (10,228 )   4,981 Total provision   $ 89,773   $ 99,433   $ 186,740 A reconciliation of the United States federal statutory income tax rate to the effective income tax rate on operations for the years ended December 31 is provided below:     For the year ended December 31, In thousands   2017   2016   2015 U.S. federal statutory rate   35.0  %   35.0  %   35.0  % State taxes   0.4  %   2.1  %   2.0  % Tax reserves   —  %   (0.2 )%   (0.4 )% Foreign   (8.3 )%   (4.3 )%   (2.1 )% Research and development credit   (0.8 )%   (1.0 )%   (0.4 )% Manufacturing deduction   (1.1 )%   (1.8 )%   (2.3 )% France tax rate change   (6.5 )%   (6.5 )%   —  % U.S. tax rate change   (7.9 )%   —  %   —  % U.S. tax reform provision   15.6  %   —  %   —  % Transaction costs related to acquisitions   —  %   1.5  %   —  % Other, net   (0.9 )%   (0.7 )%   0.1  % Effective rate   25.5  %   24.1  %   31.9  %      The 6.5% decrease in the effective tax rate due to the France tax rate change was the result of adopted tax legislation that reduces the corporate income tax rate in France from 28.0% to 25.0% over the period 2021 to 2022. The 7.9% decrease in the effective tax rate due to the U.S. tax rate change was the result of adopted tax legislation that reduces the corporate income tax rate in the U.S. from 35.0% to 21.0% effective January 1, 2018. The 15.6% increase in the effective tax rate due to the U.S. tax reform previously discussed. Deferred income taxes result from temporary differences in the recognition of income and expense for financial and income tax reporting purposes. These deferred income taxes will be recognized as future tax benefits or costs when the temporary differences reverse. Components of deferred tax assets and liabilities were as follows:     December 31, In thousands   2017   2016 Deferred income tax assets:         Accrued expenses and reserves   $ 10,961   $ 26,117 Warranty reserve   20,211   24,131 Deferred compensation/employee benefits   18,353   25,755 Pension and postretirement obligations   21,637   25,595 Inventory   19,620   22,579 Net operating loss carry forwards   65,671   59,416 Tax credit carry forwards   1,921   621 Other   13,053   2,317 Gross deferred income tax assets   171,427   186,531 Valuation allowance   25,683   21,418 Total deferred income tax assets   145,744   165,113 Deferred income tax liabilities:         Property, plant & equipment   37,015   47,321 Intangibles   288,141   359,312 Total deferred income tax liabilities   325,156   406,633 Net deferred income tax liability   $ (179,412 )   $ (241,520 ) A valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized.  As of December 31, 2017, the valuation allowance for certain foreign carryforwards was $25.7 million primarily in Brazil, China, United Kingdom, and South Africa. Net operating loss carry-forwards in the amount of $65.7 million expire in various periods from December 31, 2018 to December 31, 2037. As of December 31, 2017, the liability for income taxes associated with unrecognized tax benefits was $6.9 million, of which $4.4 million, if recognized, would favorably affect the Company’s effective income tax rate. As of December 31, 2016, the liability for income taxes associated with unrecognized tax benefits was $8.4 million, of which $4.2 million, if recognized, would favorably affect the Company’s effective tax rate. A reconciliation of the beginning and ending amount of the liability for income taxes associated with unrecognized tax benefits follows: In thousands   2017   2016   2015 Gross liability for unrecognized tax benefits at beginning of year   $ 8,423   $ 10,557   $ 12,596 Gross increases - unrecognized tax benefits in prior periods   2,466   6   — Gross increases - current period unrecognized tax benefits   —   —   1,682 Gross decreases - unrecognized tax benefits in prior periods   —   —   — Gross decreases - audit settlement during year   (3,979 )   —   (3,027 ) Gross decreases - expiration of audit statute of limitations   —   (2,140 )   (694 ) Gross liability for unrecognized tax benefits at end of year   $ 6,910   $ 8,423   $ 10,557 The Company includes interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2017, the total interest and penalties accrued was approximately $0.7 million and $0.1 million, respectively. As of December 31, 2016, the total interest and penalties accrued was approximately $0.8 million and $0.3 million, respectively. With limited exception, the Company is no longer subject to examination by various U.S. and foreign taxing authorities for years before 2012. At this time, the Company believes that it is reasonably possible that unrecognized tax benefits of approximately $5.2 million may change within the next 12 months due to the expiration of statutory review periods and current examinations.

X

- References No definition available. + Details Name: us-gaap_IncomeTaxDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details Name: us-gaap_IncomeTaxDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The computation of earnings per share from operations is as follows:     For the Year Ended December 31, In thousands, except per share data   2017   2016   2015 Numerator             Numerator for basic and diluted earnings per common share - net income attributable             to Wabtec shareholders   $ 262,261   $ 304,887   $ 398,628 Less: dividends declared - common shares and non-vested restricted stock   (42,218 )   (32,430 )   (26,963 ) Undistributed earnings   220,043   272,457   371,665 Percentage allocated to common shareholders (1)   99.7 %   99.7 %   99.7 %     219,383   271,640   370,550 Add: dividends declared - common shares   42,092   32,333   26,875 Numerator for basic and diluted earnings per common share   $ 261,475   $ 303,973   $ 397,425 Denominator             Denominator for basic earnings per common share - weighted average shares   95,453   90,359   96,074 Effect of dilutive securities:             Assumed conversion of dilutive stock-based compensation plans   672   782   932 Denominator for diluted earnings per common share - adjusted weighted average             shares and assumed conversion   96,125   91,141   97,006 Net income per common share attributable to Wabtec shareholders             Basic   $ 2.74   $ 3.37   $ 4.14 Diluted   $ 2.72   $ 3.34   $ 4.10               (1) Basic weighted-average common shares outstanding   95,453   90,359   96,074 Basic weighted-average common shares outstanding and non-vested restricted             stock expected to vest   95,740   90,627   96,388 Percentage allocated to common shareholders   99.7 %   99.7 %   99.7 % Options to purchase approximately 24,000, 20,000, and 13,000 shares of Common Stock were outstanding in 2017, 2016 and 2015, respectively, but were not included in the computation of diluted earnings because their impact would have been antidilutive.

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details Name: us-gaap_EarningsPerShareTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

STOCK-BASED COMPENSATION PLANS	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION PLANS	STOCK-BASED COMPENSATION PLANS As of December 31, 2017, the Company maintains employee stock-based compensation plans for stock options, restricted stock, and incentive stock units as governed by the 2011 Stock Incentive Compensation Plan, as amended and restated (the “2011 Plan”) and the 2000 Stock Incentive Plan, as amended (the “2000 Plan”).  The 2011 Plan has a term through May 10, 2027 and as of December 31, 2017 the number of shares available for future grants under the 2011 Plan was 3,192,453 shares, which includes remaining shares to grant under the 2000 Plan.  The amendment and restatement of the 2011 Plan was approved by stockholders of Wabtec on May 10, 2017. The Company also maintains a 1995 Non-Employee Directors’ Fee and Stock Option Plan as amended and restated (“the Directors Plan”).  The amendment and restatement of the Directors Plan was approved by stockholders of Wabtec on May 10, 2017. The Directors Plan, as amended, authorizes a total of 1,000,000 shares of Common Stock to be issued. Under the Directors Plan options issued become exercisable over a three-year vesting period and expire ten years from the date of grant and restricted stock issued under the plan vests one year from the date of grant. As compensation for directors’ fees for the years ended December 31, 2017, 2016 and 2015, the Company issued a total of 16,500, 16,972 and 11,256 shares of restricted stock to non-employee directors. The total number of shares issued under the plan as of December 31, 2017 was 881,192 shares.  Stock-based compensation expense for all of the plans was $21.3 million, $20.8 million and $26.0 million for the years ended December 31, 2017, 2016 and 2015, respectively. The Company recognized associated tax benefits related to the stock-based compensation plans of $8.9 million, $14.9 million and $15.3 million for the respective periods. Included in the stock-based compensation expense for 2017 above is $1.7 million of expense related to stock options, $7.0 million related to non-vested restricted stock, $4.6 million related to restricted stock units, $6.5 million related to incentive stock units and $1.5 million related to units issued for Directors’ fees. At December 31, 2017, unamortized compensation expense related to those stock options, non-vested restricted shares and incentive stock units expected to vest totaled $24.6 million and will be recognized over a weighted average period of 1.2 years.   Stock Options Stock options are granted to eligible employees and directors at the fair market value, which is the average of the high and low Wabtec stock price on the date of grant. Under the 2011 Plan and the 2000 Plan, options become exercisable over a four year vesting period and expire 10 years from the date of grant.   The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and Directors Plan for the years ended December 31:      Options   Weighted Average Exercise Price   Weighted Average Remaining Contractual Life   Aggregate Intrinsic value (in thousands) Outstanding at December 31, 2014   1,147,558   $ 28.33   5.5   $ 67,205 Granted   84,675   87.35       1,375 Exercised   (124,156 )   26.70       (5,516 ) Canceled   (10,754 )   65.22       (64 ) Outstanding at December 31, 2015   1,097,323   $ 32.70   4.8   $ 42,154 Granted   94,115   61.39       2,035 Exercised   (83,790 )   25.58       (4,813 ) Canceled   (8,825 )   71.47       (102 ) Outstanding at December 31, 2016   1,098,823   $ 35.39   4.3   $ 52,332 Granted   65,522   86.91       — Exercised   (166,838 )   21.37       (10,020 ) Canceled   (13,995 )   76.89       (64 ) Outstanding at December 31, 2017   983,512   $ 40.62   4.0   $ 40,137 Exercisable at December 31, 2017   802,609   $ 32.52   3.3   $ 36,848 Options outstanding at December 31, 2017 were as follows:      Number of Options   Weighted Average Exercise Price of Options   Weighted Average Remaining Contractual   Number of Options Currently   Weighted Average Exercise Price of Options Currently Range of exercise prices   Outstanding   Outstanding   Life   Exercisable   Exercisable Under $15.00   180,000   $ 14.50   1.1   180,000   $ 14.50 15.00 - 23.00   193,701   18.77   1.3   193,701   18.77 23.00 - 30.00   136,924   28.75   2.8   136,924   28.75 30.00 - 38.00   94,496   35.24   4.1   94,496   35.24 Over 38.00   378,391   69.86   7.0   197,488   63.72     983,512   $ 40.62       802,609   $ 32.52     The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:      For the year ended December 31,     2017   2016   2015 Dividend yield   0.23 %   0.26 %   0.14 % Risk-free interest rate   2.2 %   1.5 %   1.8 % Stock price volatility   23.4 %   26.9 %   27.3 % Expected life (years)   5.0   5.0   5.0 Weighted average fair value of options granted during the year   $ 20.69   $ 14.96   $ 24.41 The dividend yield is based on the Company’s dividend rate and the current market price of the underlying common stock at the date of grant. Expected life in years is determined from historical stock option exercise data. Expected volatility is based on the historical volatility of the Company’s stock. The risk-free interest rate is based on the 7 years U.S. Treasury bond rates for the expected life of the option. Restricted Stock and Incentive Stock  Beginning in 2006 the Company adopted a restricted stock program. As provided for under the 2011 and 2000 Plans, eligible employees are granted restricted stock that generally vests over four years from the date of grant. Under the Directors Plan, restricted stock units vest one year from the date of grant. In addition, the Company has issued incentive stock units to eligible employees that vest upon attainment of certain cumulative three-year performance goals. Based on the Company’s performance for each three year period then ended, the incentive stock units can vest and be awarded ranging from 0% to 200% of the initial incentive stock units granted. The incentive stock units included in the table below represent the number of shares that are expected to vest based on the Company’s estimate for meeting those established performance targets. As of December 31, 2017, the Company estimates that it will achieve 84%, 77% and 91% for the incentive stock units expected to vest based on performance for the three year periods ending December 31, 2017, 2018, and 2019, respectively, and has recorded incentive compensation expense accordingly. If our estimate of the number of these stock units expected to vest changes in a future accounting period, cumulative compensation expense could increase or decrease and will be recognized in the current period for the elapsed portion of the vesting period and would change future expense for the remaining vesting period. Compensation expense for the non-vested restricted stock and incentive stock units is based on the closing price of the Company’s common stock on the date of grant and recognized over the applicable vesting period. The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the years ended December 31:      Restricted Stock and Units   Incentive Stock Awards   Weighted Average Grant Date Fair Value Outstanding at December 31, 2014   438,543   791,608   $ 47.97 Granted   113,945   126,050   87.90 Vested   (182,776 )   (433,932 )   37.76 Adjustment for incentive stock awards expected to vest   —   65,666   57.57 Canceled   (12,827 )   (7,754 )   67.05 Outstanding at December 31, 2015   356,885   541,638   $ 65.89 Granted   212,600   167,850   66.03 Vested   (159,975 )   (236,591 )   51.80 Adjustment for incentive stock awards expected to vest   —   (38,164 )   74.42 Canceled   (13,215 )   (9,983 )   71.84 Outstanding at December 31, 2016   396,295   424,750   $ 72.18 Granted   153,516   157,025   86.66 Vested   (137,088 )   (153,271 )   70.34 Adjustment for incentive stock awards expected to vest   —   (87,592 )   73.69 Canceled   (13,723 )   (13,579 )   76.61 Outstanding at December 31, 2017   399,000   327,333   $ 78.76

X

- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

OTHER COMPREHENSIVE LOSS	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
OTHER COMPREHENSIVE LOSS	OTHER COMPREHENSIVE LOSS The components of accumulated other comprehensive loss were:     December 31, In thousands   2017   2016 Foreign currency translation gain (loss)   $ 5,063   $ (321,033 ) Unrealized gain (loss) on interest rate swap contracts, net of tax of $1,338 and $1,540   4,015   (2,957 ) Unrealized loss on pension and post-retirement benefit plans, net of tax of $19,532 and $20,832   (54,070 )   (55,615 ) Total accumulated other comprehensive loss   $ (44,992 )   $ (379,605 )   The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2017 are as follows:       Foreign currency   Derivative   Pension and post retirement     In thousands   translation   contracts   benefits plans   Total Balance at December 31, 2016   $ (321,033 )   $ (2,957 )   $ (55,615 )   $ (379,605 ) Other comprehensive income before reclassifications   326,096   6,712   (1,017 )   331,791 Amounts reclassified from accumulated other                 comprehensive income   —   260   2,562   2,822 Net current period other comprehensive income   326,096   6,972   1,545   334,613 Balance at December 31, 2017   $ 5,063   $ 4,015   $ (54,070 )   $ (44,992 ) Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2017 are as follows:      Amount reclassified from accumulated other   Affected line item in the Condensed Consolidated In thousands   comprehensive income   Statements of Income Amortization of defined pension and post retirement items         Amortization of initial net obligation and prior service cost   $ (1,496 )   Cost of sales Amortization of net loss (gain)   5,037   Cost of sales     3,541   Income from Operations     (979 )   Income tax expense     $ 2,562   Net income Derivative contracts         Realized loss on derivative contracts   400   Interest expense, net     (140 )   Income tax expense     $ 260   Net income The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2016 are as follows:     Foreign currency   Derivative   Pension and post retirement     In thousands   translation   contracts   benefits plans   Total Balance at December 31, 2015   $ (227,349 )   $ (2,987 )   $ (46,383 )   $ (276,719 ) Other comprehensive income before reclassifications   (93,684 )   (1,286 )   (10,874 )   (105,844 ) Amounts reclassified from accumulated other                 comprehensive income   —   1,316   1,642   2,958 Net current period other comprehensive income   (93,684 )   30   (9,232 )   (102,886 ) Balance at December 31, 2016   $ (321,033 )   $ (2,957 )   $ (55,615 )   $ (379,605 ) Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2016 are as follows:      Amount reclassified from accumulated other   Affected line item in the Condensed Consolidated In thousands   comprehensive income   Statements of Income Amortization of defined pension and post retirement items         Amortization of initial net obligation and prior service cost   $ (1,652 )   Cost of sales Amortization of net loss (gain)   3,989   Cost of sales     2,337   Income from Operations     (695 )   Income tax expense     $ 1,642   Net income Derivative contracts         Realized loss on derivative contracts   1,873   Interest expense, net     (557 )   Income tax expense     $ 1,316   Net income

X

- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details Name: us-gaap_ComprehensiveIncomeNoteTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EquityAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

OPERATING LEASES	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
OPERATING LEASES	OPERATING LEASES The Company leases office and manufacturing facilities under operating leases with terms ranging from one to 15 years, excluding renewal options. Total net rental expense charged to operations in 2017, 2016, and 2015 was $34.6 million, $27.2 million and $20.2 million, respectively. The amounts above are shown net of sublease rentals which were immaterial for the years 2017, 2016 and 2015, respectively.  Future minimum rental payments under operating leases with remaining non-cancelable terms in excess of one year are as follows:     Real         In thousands   Estate   Equipment   Total 2018   $ 28,957   $ 2,690   $ 31,647 2019   25,857   1,925   27,782 2020   24,266   976   25,242 2021   19,561   512   20,073 2022   16,350   271   16,621 2023 and after   66,017   24   66,041

X

- References No definition available. + Details Name: us-gaap_LeasesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details Name: us-gaap_LeasesOfLesseeDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

WARRANTIES	12 Months Ended
	Dec. 31, 2017
Product Warranties Disclosures [Abstract]
WARRANTIES	WARRANTIES The following table reconciles the changes in the Company’s product warranty reserve as follows: In thousands   2017   2016 Balance at beginning of year   $ 138,992   $ 92,064 Warranty expense   50,385   28,947 Acquisitions   806   59,685 Warranty claim payments   (48,548 )   (38,772 ) Foreign currency impact   11,428   (2,932 ) Balance at end of year   $ 153,063   $ 138,992

X

- References No definition available. + Details Name: us-gaap_ProductWarrantiesDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details Name: us-gaap_ProductWarrantyDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

PREFERRED STOCK	12 Months Ended
	Dec. 31, 2017
Disclosure Preferred Stock Additional Information [Abstract]
PREFERRED STOCK	PREFERRED STOCK The Company’s authorized capital stock includes 1,000,000 shares of preferred stock. The Board of Directors has the authority to issue the preferred stock and to fix the designations, powers, preferences and rights of the shares of each such class or series, including dividend rates, conversion rights, voting rights, terms of redemption and liquidation preferences, without any further vote or action by the Company’s shareholders. The rights and preferences of the preferred stock would be superior to those of the common stock. At December 31, 2017 and 2016 there was no preferred stock issued or outstanding.

X

- Definition The entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details Name: us-gaap_PreferredStockTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure preferred stock additional information. + References No definition available. + Details Name: wab_DisclosurePreferredStockAdditionalInformationAbstract Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING	DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING Foreign Currency Hedging The Company uses forward contracts to mitigate its foreign currency exchange rate exposure due to forecasted sales of finished goods and future settlement of foreign currency denominated assets and liabilities. Derivatives used to hedge forecasted transactions and specific cash flows associated with foreign currency denominated financial assets and liabilities that meet the criteria for hedge accounting are designated as cash flow hedges. The effective portion of gains and losses is deferred as a component of accumulated other comprehensive income and is recognized in earnings at the time the hedged item affects earnings, in the same line item as the underlying hedged item. The contracts are scheduled to mature within two years. For the twelve months ended December 31, 2017, the amount reclassified into income was $0.4 million. Other Activities The Company enters into certain derivative contracts in accordance with its risk management strategy that do not meet the criteria for hedge accounting but which have the impact of largely mitigating foreign currency exposure. These foreign exchange contracts are accounted for on a full mark to market basis through earnings, with gains and losses recorded as a component of other expense, net. The net unrealized gain related to these contracts was $2.1 million for the twelve months ended December 31, 2017. The notional amount and fair value of foreign exchange contracts that did not meet the criteria for hedge accounting at December 31, 2017 was not material. These contracts are scheduled to mature within one year. The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedged discussed in the above sections: In millions   Designated   Non-Designated   Total Gross notional amount   $ 805.1   $ 379.7   $ 1,184.8               Fair Value:             Other current assets   3.5   2.1   5.6 Other current liabilities   —   —   — Total   $ 3.5   $ 2.1   $ 5.6 Interest Rate Hedging The Company uses interest rate swaps to manage interest rate exposures. The Company is exposed to interest rate volatility with regard to existing floating rate debt. Primary exposure includes the London Interbank Offered Rates (LIBOR). Derivatives used to hedge risk associated with changes in the fair value of certain variable-rate debt are primarily designated as fair value hedges. Consequently, changes in the fair value of these derivatives, along with changes in the fair value of debt obligations are recognized in current period earnings. See long-term debt footnote fair value measurement footnote for further information on current interest rate swaps. As of December 31, 2017, the Company has recorded a current liability of $1.2 million and an accumulated other comprehensive loss of $0.7 million, net of tax, related to these agreements.

X

- References No definition available. + Details Name: us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details Name: us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS ASC 820 “Fair Value Measurements and Disclosures” defines fair value, establishes a framework for measuring fair value and explains the related disclosure requirements. ASC 820 indicates, among other things, that a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model. Valuation Hierarchy. ASC 820 establishes a valuation hierarchy for disclosure of the inputs to valuation used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2017, which are included in other current liabilities on the Consolidated Balance sheet:          Fair Value Measurements at December 31, 2017 Using     Total Carrying Value at December 31,   Quoted Prices in Active Markets for Identical Assets   Significant Other Observable Inputs   Significant Unobservable Inputs In thousands   2017   (Level 1)   (Level 2)   (Level 3) Interest rate swap agreements   1,163   —   1,163   — Total   $ 1,163   $ —   $ 1,163   $ — The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2016, which are included in other current liabilities on the Consolidated Balance sheet:          Fair Value Measurements at December 31, 2016 Using     Total Carrying Value at December 31,   Quoted Prices in Active Markets for Identical Assets   Significant Other Observable Inputs   Significant Unobservable Inputs In thousands   2016   (Level 1)   (Level 2)   (Level 3) Interest rate swap agreements   3,888   —   3,888   — Total   $ 3,888   $ —   $ 3,888   $ —   To reduce the impact of interest rate changes on a portion of its variable-rate debt, the Company entered into interest rate swaps which effectively converted a portion of the debt from variable to fixed-rate borrowings during the term of the swap contracts. For certain derivative contracts whose fair values are based upon trades in liquid markets, such as interest rate swaps, valuation model inputs can generally be verified and valuation techniques do not involve significant management judgment. The fair values of such financial instruments are generally classified within Level 2 of the fair value hierarchy. As a result of our global operating activities the Company is exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, the Company minimizes these risks through entering into foreign currency forward contracts. The foreign currency forward contracts are valued using broker quotations, or market transactions in either the listed or over-the counter markets. As such, these derivative instruments are classified within level 2. The Company’s cash and cash equivalents are highly liquid investments purchased with an original maturity of three months or less and are considered Level 1 on the fair value valuation hierarchy. The fair value of cash and cash equivalents approximated the carrying value at December 31, 2017 and December 31, 2016. The Company’s defined benefit pension plan assets consist primarily of equity security funds, debt security funds and temporary cash and cash equivalent investments. These investments are comprised of a number of investment funds that invest in a diverse portfolio of assets including equity securities, corporate and governmental bonds, and money markets.  Trusts are valued at the net asset value (“NAV”) as determined by their custodian.  NAV represents the accumulation of the unadjusted quoted close prices on the reporting date for the underlying investments divided by the total shares outstanding at the reporting dates.  The 2013 and 2016 Notes are considered Level 2 based on the fair value valuation hierarchy. The estimated fair values and related carrying values of the Company’s financial instruments are as follows:     December 31, 2017   December 31, 2016     Carry   Fair   Carry   Fair In thousands   Value   Value   Value   Value Interest rate swap agreements   $ 1,163   $ 1,163   $ 3,888   $ 3,888 4.375% Senior Notes   248,567   262,033   248,310   260,265 3.45% Senior Notes   747,655   741,113   747,474   719,273   The fair value of the Company’s interest rate swap agreements and the 2013 and 2016 Notes were based on dealer quotes and represent the estimated amount the Company would pay to the counterparty to terminate the agreement.

X

- References No definition available. + Details Name: us-gaap_FairValueDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details Name: us-gaap_FairValueMeasurementInputsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The Company is subject to a variety of environmental laws and regulations governing discharges to air and water, the handling, storage and disposal of hazardous or solid waste materials and the remediation of contamination associated with releases of hazardous substances. The Company believes its operations currently comply in all material respects with all of the various environmental laws and regulations applicable to our business; however, there can be no assurance that environmental requirements will not change in the future or that we will not incur significant costs to comply with such requirements. Under terms of the purchase agreement and related documents for the 1990 Acquisition, American Standard, Inc., now known as Trane (“Trane”), has indemnified the Company for certain items including, among other things, certain environmental claims the Company asserted prior to 2000. If Trane was unable to honor or meet these indemnifications, the Company would be responsible for such items. In the opinion of Management, Trane currently has the ability to meet its indemnification obligations. Claims have been filed against the Company and certain of its affiliates in various jurisdictions across the United States by persons alleging bodily injury as a result of exposure to asbestos-containing products. Most of these claims have been made against our wholly owned subsidiary, Railroad Friction Products Corporation (“RFPC”), and are based on a product sold by RFPC prior to the time that the Company acquired any interest in RFPC. Most of these claims, including all of the RFPC claims, are submitted to insurance carriers for defense and indemnity or to non-affiliated companies that retain the liabilities for the asbestos-containing products at issue. We cannot, however, assure that all these claims will be fully covered by insurance or that the indemnitors or insurers will remain financially viable. Our ultimate legal and financial liability with respect to these claims, as is the case with other pending litigation, cannot be estimated. It is management’s belief that the potential range of loss for asbestos-related bodily injury cases is not reasonably determinable at present due to a variety of factors, including: (1) the asbestos case settlement history of the Company’s wholly owned subsidiary, RFPC; (2) the unpredictable nature of personal injury litigation in general; and (3) the uncertainty of asbestos litigation in particular. Despite this uncertainty, and although the results of the Company’s operations and cash flows for any given period could be adversely affected by asbestos-related lawsuits, Management believes that the final resolution of the Company’s asbestos-related cases will not be material to the Company’s overall financial position, results of operations and cash flows. In general, this belief is based upon: (1) Wabtec’s and RFPC’s history of settlements and dismissals of asbestos-related cases to date; (2) the inability of many plaintiffs to establish any exposure or causal relationship to RFPC’s product; and (3) the inability of many plaintiffs to demonstrate any identifiable injury or compensable loss. More specifically, as to RFPC, management’s belief that any losses due to asbestos-related cases would not be material is also based on the fact that RFPC owns insurance which provides coverage for asbestos-related bodily injury claims. To date, RFPC’s insurers have provided RFPC with defense and indemnity in these actions. The overall number of new claims being filed against RFPC has dropped significantly in recent years; however, these new claims, and all previously filed claims, may take a significant period of time to resolve. As to Wabtec and its divisions, Management’s belief that asbestos-related cases will not have a material impact is also based on its position that it has no legal liability for asbestos-related bodily injury claims, and that the former owners of Wabtec’s assets retained asbestos liabilities for the products at issue. To date, Wabtec has been able to successfully defend itself on this basis, including two arbitration decisions and a judicial opinion, all of which confirmed Wabtec’s position that it did not assume any asbestos liabilities from the former owners of certain Wabtec assets. Although Wabtec has incurred defense and administrative costs in connection with asbestos bodily injury actions, these costs have not been material, and the Company has no information that would suggest these costs would become material in the foreseeable future. On April 21, 2016, Siemens Industry, Inc. filed a lawsuit against the Company in federal district court in Delaware alleging that the Company has infringed seven patents owned by Siemens, all of which relate to Positive Train Control technology. On November 2, 2016, Siemens amended its complaint to add six additional patents they also claim are infringed by the Company’s Positive Train Control Products. The Company has filed Answers, and asserted counterclaims, in response to Siemens’ complaints. The case is still in the preliminary stages, but the Company has begun filing for Inter-Parties Review proceedings before the U.S. Patent & Trademark Office seeking to invalidate the Siemens patents. Wabtec believes the claims are without merit and is vigorously defending itself. Xorail, Inc., a wholly owned subsidiary of the Company (“Xorail”), has received notices from Denver Transit Constructors (“Denver Transit”) alleging breach of contract related to the operating of constant warning wireless crossings, and late delivery of the Train Management & Dispatch System (“TMDS”) for the Denver Eagle P3 Project, which is owned by the Denver Regional Transit District ("RTD"). No damages have been asserted for the alleged late delivery of the TMDS, and Xorail is in the final stages of successfully implementing a recovery plan concerning the TMDS issues. With regard to the wireless crossings, as of September 8, 2017, Denver Transit alleged that total damages were $36.8 million through July 31, 2017, and are continuing to accumulate. The crossings have not been certified for use without flaggers, which Denver Transit alleges is due to Xorail's failure to achieve constant warning times satisfactory to the Federal Railway Administration ("FRA") and the Public Utility Commission ("PUC"). No claims have been filed by Denver Transit with regard to either issue. Xorail has denied Denver Transit’s assertions regarding the wireless crossings, and Denver Transit has also notified RTD that Denver Transit considers the new certification requirements imposed by FRA and/or PUC as a change in law, for which neither Denver Transit nor its subcontractors are liable. Xorail has worked with Denver Transit to modify its system to meet the FRA’s and PUC's previously undefined, and evolving, certification requirements. On September 28, 2017, the FRA granted a 5 year approval of the modified wireless crossing system as currently implemented; however, the PUC has not granted approval of the modified system and therefore the crossings are still not certified for use without flaggers. Denver Transit and RTD are continuing to seek approval from PUC. The Company does not believe that it has any liability with respect to the wireless crossing issue. From time to time the Company is involved in litigation relating to claims arising out of its operations in the ordinary course of business. As of the date hereof, the Company is involved in no litigation that the Company believes will have a material adverse effect on its financial condition, results of operations or liquidity.

X

- References No definition available. + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION Wabtec has two reportable segments—the Freight Segment and the Transit Segment. The key factors used to identify these reportable segments are the organization and alignment of the Company’s internal operations, the nature of the products and services, and customer type. The business segments are: Freight Segment primarily manufactures and services components for new and existing freight cars and locomotives, builds new switcher locomotives, rebuilds freight locomotives, supplies railway electronics, positive train control equipment, signal design and engineering services, and provides related heat exchange and cooling systems. Customers include large, publicly traded railroads, leasing companies, manufacturers of original equipment such as locomotives and freight cars, and utilities. Transit Segment primarily manufactures and services components for new and existing passenger transit vehicles, typically regional trains, high speed trains, subway cars, light-rail vehicles and buses, builds new commuter locomotives, refurbishes subway cars, provides heating, ventilation, and air conditioning equipment, and doors for buses and subways. Customers include public transit authorities and municipalities, leasing companies, and manufacturers of subway cars and buses around the world. The Company evaluates its business segments’ operating results based on income from operations. Intersegment sales are accounted for at prices that are generally established by reference to similar transactions with unaffiliated customers. Corporate activities include general corporate expenses, elimination of intersegment transactions, interest income and expense and other unallocated charges. Since certain administrative and other operating expenses and other items have not been allocated to business segments, the results in the following tables are not necessarily a measure computed in accordance with generally accepted accounting principles and may not be comparable to other companies.  Segment financial information for 2017 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 1,396,588   $ 2,485,168   $ —   $ 3,881,756 Intersegment sales/(elimination)   37,630   21,548   (59,178 )   — Total sales   $ 1,434,218   $ 2,506,716   $ (59,178 )   $ 3,881,756 Income (loss) from operations   $ 264,603   $ 188,546   $ (31,416 )   $ 421,733 Interest expense and other, net   —   —   (69,670 )   (69,670 ) Income (loss) from operations before income taxes   $ 264,603   $ 188,546   $ (101,086 )   $ 352,063 Depreciation and amortization   $ 43,721   $ 57,441   $ 2,086   $ 103,248 Capital expenditures   33,921   50,762   4,783   89,466 Segment assets   3,504,289   7,562,122   (4,486,431 )   6,579,980                   Segment financial information for 2016 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 1,543,098   $ 1,388,090   $ —   $ 2,931,188 Intersegment sales/(elimination)   39,519   9,393   (48,912 )   $ — Total sales   $ 1,582,617   $ 1,397,483   $ (48,912 )   $ 2,931,188 Income (loss) from operations   $ 344,455   $ 171,446   $ (57,540 )   $ 458,361 Interest expense and other, net   —   —   (45,524 )   (45,524 ) Income (loss) from operations before income taxes   $ 344,455   $ 171,446   $ (103,064 )   $ 412,837 Depreciation and amortization   $ 36,519   $ 31,545   $ 1,731   $ 69,795 Capital expenditures   22,726   20,987   6,503   50,216 Segment assets   2,949,668   6,720,302   (3,088,952 )   6,581,018 Segment financial information for 2015 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 2,054,715   $ 1,235,283   $ —   $ 3,307,998 Intersegment sales/(elimination)   35,372   10,895   (46,267 )   — Total sales   $ 2,090,087   $ 1,264,178   $ (46,267 )   $ 3,307,998 Income (loss) from operations   $ 482,640   $ 150,988   $ (26,061 )   $ 607,567 Interest expense and other, net   —   —   (22,199 )   (22,199 ) Income (loss) from operations before income taxes   $ 482,640   $ 150,988   $ (48,260 )   $ 585,368 Depreciation and amortization   $ 36,834   $ 26,196   $ 1,704   $ 64,734 Capital expenditures   24,715   22,996   1,717   49,428 Segment assets   2,708,724   2,202,614   (1,681,825 )   3,229,513   The following geographic area data as of and for the years ended December 31, 2017, 2016 and 2015, respectively, includes net sales based on product shipment destination and long-lived assets, which consist of plant, property and equipment, net of depreciation, resident in their respective countries:     Net Sales   Long-Lived Assets In thousands   2017   2016   2015   2017   2016   2015 United States   $ 1,323,781   $ 1,362,255   $ 1,754,924   $ 211,608   $ 205,895   $ 171,362 United Kingdom   356,493   322,563   368,505   57,668   54,215   63,694 Canada   279,013   206,258   204,674   5,822   5,156   4,876 France   237,454   66,287   45,565   57,849   33,636   7,194 Germany   208,817   98,364   92,422   71,709   57,902   31,642 China   178,137   106,357   100,586   36,388   42,672   12,256 Mexico   160,029   183,583   190,034   9,117   8,766   8,839 Italy   142,037   45,771   38,164   30,329   27,253   15,170 India   137,837   24,161   12,345   12,519   1,271   1,946 Australia   136,127   82,099   86,809   10,483   8,039   8,424 Brazil   69,378   51,493   84,595   13,184   13,227   9,318 Other international   652,653   381,997   329,375   57,296   60,344   18,472 Total   $ 3,881,756   $ 2,931,188   $ 3,307,998   $ 573,972   $ 518,376   $ 353,193   Export sales from the Company’s United States operations were $448.0 million, $470.5 million and $508.4 million for the years ended December 31, 2017, 2016 and 2015, respectively. Sales by product are as follows: In thousands   2017   2016   2015 Specialty Products & Electronics   $ 1,350,727   $ 1,374,580   $ 1,733,881 Brake Products   749,959   588,081   627,552 Remanufacturing, Overhaul & Build   522,275   559,284   606,624 Transit Products   1,112,340   276,124   189,581 Other   146,455   133,119   150,360 Total sales   $ 3,881,756   $ 2,931,188   $ 3,307,998

X

- References No definition available. + Details Name: us-gaap_SegmentReportingAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details Name: us-gaap_SegmentReportingDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION The obligations under the Company's 2016 Notes, 2013 Notes and Revolving Credit Facility and Term Loan are fully and unconditionally guaranteed by all U.S. subsidiaries as guarantors. Each guarantor is 100% owned by the parent company. In accordance with positions established by the Securities and Exchange Commission, the following shows separate financial information with respect to the parent, the guarantor subsidiaries and the non-guarantor subsidiaries. The principal elimination entries eliminate investment in subsidiaries and certain intercompany balances and transactions. Balance Sheet for December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Cash and cash equivalents $ 933   $ 4,802   $ 227,666   $ —   $ 233,401 Receivables, net 77,046   237,360   852,381   —   1,166,787 Inventories 120,937   137,972   483,725   —   742,634 Current assets - other 1,142   4,507   116,642   —   122,291 Total current assets 200,058   384,641   1,680,414   —   2,265,113 Property, plant and equipment 52,532   136,382   385,058   —   573,972 Goodwill 25,274   546,527   1,888,302   —   2,460,103 Investment in subsidiaries 6,517,205   2,570,391   —   (9,087,596 )   — Other intangibles, net 30,575   251,347   922,510   —   1,204,432 Other long term assets 17,414   295   58,651   —   76,360 Total assets $ 6,843,058   $ 3,889,583   $ 4,934,935   $ (9,087,596 )   $ 6,579,980 Current liabilities $ 196,827   217,176   $ 1,159,327   —   $ 1,573,330 Inter-company 2,121,546   (2,026,634 )   (94,912 )   —   — Long-term debt 1,661,771   14   161,518   —   1,823,303 Long-term liabilities - other 54,046   67,824   232,945   —   354,815 Total liabilities 4,034,190   (1,741,620 )   1,458,878   —   3,751,448 Shareholders' equity 2,808,868   5,632,665   3,454,931   (9,087,596 )   2,808,868 Non-controlling interest —   (1,462 )   21,126   —   19,664 Total shareholders' equity $ 2,808,868   $ 5,631,203   $ 3,476,057   $ (9,087,596 )   $ 2,828,532 Total Liabilities and Shareholders' Equity $ 6,843,058   $ 3,889,583   $ 4,934,935   $ (9,087,596 )   $ 6,579,980 Balance Sheet for December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Cash and cash equivalents $ 2,522   $ 9,496   $ 386,466   $ —   $ 398,484 Receivables, net 79,041   202,779   660,688   —   942,508 Inventories 120,042   128,076   410,392   —   658,510 Current assets - other 52,576   (17,844 )   833,397   —   868,129 Total current assets 254,181   322,507   2,290,943   —   2,867,631 Property, plant and equipment 49,031   126,661   342,684   —   518,376 Goodwill 25,275   477,472   1,576,018   —   2,078,765 Investment in subsidiaries 5,388,613   1,325,150   —   (6,713,763 )   — Other intangibles, net 31,897   204,512   817,451   —   1,053,860 Other long term assets 9,592   (1,914 )   54,708   —   62,386 Total assets $ 5,758,589   $ 2,454,388   $ 5,081,804   $ (6,713,763 )   $ 6,581,018 Current liabilities $ 194,983   196,956   $ 1,054,700   —   $ 1,446,639 Inter-company 1,562,399   (1,848,777 )   286,378   —   — Long-term debt 1,761,933   58   976   —   1,762,967 Long-term liabilities - other 33,298   74,977   286,312   —   394,587 Total liabilities 3,552,613   (1,576,786 )   1,628,366   —   3,604,193 Shareholders' equity 2,205,976   4,032,250   2,681,514   (6,713,763 )   2,205,977 Non-controlling interest —   (1,076 )   771,924   —   770,848 Total shareholders' equity $ 2,205,976   $ 4,031,174   $ 3,453,438   $ (6,713,763 )   $ 2,976,825 Total Liabilities and Shareholders' Equity $ 5,758,589   $ 2,454,388   $ 5,081,804   $ (6,713,763 )   $ 6,581,018 Income Statement for the Year Ended December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 577,397   $ 1,067,954   $ 2,378,817   $ (142,412 )   $ 3,881,756 Cost of sales (440,911 )   (675,546 )   (1,808,370 )   108,384   (2,816,443 ) Gross profit (loss) 136,486   392,408   570,447   (34,028 )   1,065,313 Total operating expenses (113,872 )   (123,423 )   (406,285 )   —   (643,580 ) Income (loss) from operations 22,614   268,985   164,162   (34,028 )   421,733 Interest (expense) income, net (72,233 )   8,843   (5,314 )   —   (68,704 ) Other income (expense), net 5,103   289   (6,358 )   —   (966 ) Equity earnings (loss) 416,068   131,620   —   (547,688 )   — Pretax income (loss) 371,552   409,737   152,490   (581,716 )   352,063 Income tax expense (109,294 )   32,393   (12,872 )   —   (89,773 ) Net income (loss) 262,258   442,130   139,618   (581,716 )   262,290 Less: Net income attributable to noncontrolling interest —   386   (415 )   —   (29 ) Net income (loss) attributable to Wabtec shareholders $ 262,258   $ 442,516   $ 139,203   $ (581,716 )   $ 262,261                     Comprehensive income (loss) attributable to Wabtec shareholders $ 263,907   $ 442,516   $ 472,167   $ (581,716 )   $ 596,874 Income Statement for the Year Ended December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 641,809   $ 1,112,001   $ 1,322,937   $ (145,559 )   $ 2,931,188 Cost of sales (473,700 )   (708,062 )   (928,608 )   103,421   (2,006,949 ) Gross profit (loss) 168,109   403,939   394,329   (42,138 )   924,239 Total operating expenses (141,940 )   (122,617 )   (201,321 )   —   (465,878 ) (Loss) income from operations 26,169   281,322   193,008   (42,138 )   458,361 Interest (expense) income, net (34,975 )   7,012   (14,598 )   —   (42,561 ) Other income (expense), net 20,509   (2,284 )   (21,188 )   —   (2,963 ) Equity earnings (loss) 322,650   131,234   —   (453,884 )   — Pretax income (loss) 334,353   417,284   157,222   (496,022 )   412,837 Income tax expense (29,466 )   (57,667 )   (12,300 )   —   (99,433 ) Net income (loss) 304,887   359,617   144,922   (496,022 )   313,404 Less: Net income attributable to noncontrolling interest —   —   (8,517 )   —   (8,517 ) Net income attributable to Wabtec shareholders $ 304,887   $ 359,617   $ 136,405   $ (496,022 )   $ 304,887                     Comprehensive income (loss) attributable to Wabtec shareholders $ 305,180   $ 359,617   $ 33,226   $ (496,022 )   $ 202,001 Income Statement for the Year Ended December 31, 2015: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 743,262   $ 1,436,935   $ 1,300,577   $ (172,776 )   $ 3,307,998 Cost of sales (531,269 )   (843,104 )   (976,798 )   90,989   (2,260,182 ) Gross (loss) profit 211,993   593,831   323,779   (81,787 )   1,047,816 Total operating expenses (142,953 )   (131,251 )   (166,045 )   —   (440,249 ) (Loss) income from operations 69,040   462,580   157,734   (81,787 )   607,567 Interest (expense) income, net (23,129 )   5,914   327   —   (16,888 ) Other income (expense), net 23,193   (9,140 )   (19,364 )   —   (5,311 ) Equity earnings (loss) 506,903   112,286   —   (619,189 )   — Pretax income (loss) 576,007   571,640   138,697   (700,976 )   585,368 Income tax expense (177,379 )   8,989   (18,350 )   —   (186,740 ) Net income (loss) 398,628   580,629   120,347   (700,976 )   398,628 Less: Net income attributable to noncontrolling interest —   —   —   —   — Net income attributable to Wabtec shareholders $ 398,628   $ 580,629   $ 120,347   $ (700,976 )   $ 398,628                     Comprehensive income (loss) attributable to Wabtec shareholders $ 409,734   $ 580,629   $ (7,992 )   $ (700,976 )   $ 281,395      Condensed Statement of Cash Flows for the year ended December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash (used in) provided by operating activities $ (49,231 )   $ 249,204   $ 22,866   $ (34,028 )   $ 188,811 Net cash used in investing activities (11,156 )   (120,661 )   (143,912 )   —   (275,729 ) Net cash provided by (used in) financing activities 58,798   (133,237 )   (57,020 )   34,028   (97,431 ) Effect of changes in currency exchange rates —   —   19,266   —   19,266 Increase (decrease) in cash (1,589 )   (4,694 )   (158,800 )   —   (165,083 ) Cash, beginning of year 2,522   9,496   386,466   —   398,484 Cash, end of year $ 933   $ 4,802   $ 227,666   $ —   $ 233,401 Condensed Statement of Cash Flows for the year ended December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash provided by (used in) operating activities $ (44,611 )   $ 332,822   $ 204,457   $ (42,138 )   $ 450,530 Net cash used in investing activities (829,783 )   (14,725 )   69,443   —   (775,065 ) Net cash (used in) provided by financing activities 876,916   (321,758 )   (74,325 )   42,138   522,971 Effect of changes in currency exchange rates —   —   (26,143 )   —   (26,143 ) (Decrease) increase in cash 2,522   (3,661 )   173,432   —   172,293 Cash, beginning of year —   13,157   213,034   —   226,191 Cash, end of year $ 2,522   $ 9,496   $ 386,466   $ —   $ 398,484 Condensed Statement of Cash Flows for the year ended December 31, 2015: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash provided by (used in) operating activities $ (90,374 )   $ 487,516   $ 135,489   $ (81,787 )   $ 450,844 Net cash used in investing activities (7,862 )   (109,326 )   (262,948 )   —   (380,136 ) Net cash provided by (used in) financing activities (48,570 )   (378,330 )   93,615   81,787   (251,498 ) Effect of changes in currency exchange rates —   —   (18,868 )   —   (18,868 ) Increase in cash (146,806 )   (140 )   (52,712 )   —   (199,658 ) Cash, beginning of year 146,806   13,297   265,746   —   425,849 Cash, end of year $ —   $ 13,157   $ 213,034   $ —   $ 226,191

X

- References No definition available. + Details Name: us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96868048&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details Name: us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

OTHER (EXPENSE) INCOME, NET	12 Months Ended
	Dec. 31, 2017
Other Income and Expenses [Abstract]
OTHER (EXPENSE) INCOME, NET	OTHER (EXPENSE) INCOME, NET The components of other (expense) income, net are as follows:     For the year ended December 31, In thousands   2017   2016   2015 Foreign currency loss   $ (6,618 )   $ (4,001 )   $ (4,659 ) Equity income   2,579   409   — Other miscellaneous income (expense)   3,073   629   (652 ) Total other (expense) income, net   $ (966 )   $ (2,963 )   $ (5,311 )

X

- References No definition available. + Details Name: us-gaap_OtherIncomeAndExpensesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details Name: us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)       First   Second   Third   Fourth In thousands, except per share data   Quarter   Quarter   Quarter   Quarter (1) 2017                 Net sales   $ 916,034   $ 932,253   $ 957,931   $ 1,075,538 Gross profit   269,707   273,963   253,203   268,440 Income from operations   114,858   113,701   102,011   91,163 Net income attributable to Wabtec shareholders   73,889   72,025   67,399   48,948 Basic earnings from operations per common share   $ 0.77   $ 0.75   $ 0.70   $ 0.51 Diluted earnings from operations per common share   $ 0.77   $ 0.75   $ 0.70   $ 0.51 2016                 Net sales   $ 772,031   $ 723,601   $ 675,574   $ 759,982 Gross profit   255,180   237,389   212,481   219,189 Income from operations   142,181   133,284   120,096   62,800 Net income attributable to Wabtec shareholders   94,163   90,485   82,428   46,328 Basic earnings from operations per common share   $ 1.03   $ 1.00   $ 0.92   $ 0.42 Diluted earnings from operations per common share   $ 1.02   $ 1.00   $ 0.91   $ 0.42  (1) Results from the fourth quarter of 2017 include project adjustments related to prior periods which decreased income from operations by approximately $14.8 million. The effect of these project adjustments was not material. The Company operates on a four-four-five week accounting quarter, and the quarters end on or about March 31, June 30 and September 30. The fiscal year ends on December 31.

X

- References No definition available. + Details Name: us-gaap_QuarterlyFinancialInformationDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details Name: us-gaap_QuarterlyFinancialInformationTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

Schedule II - Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Valuation And Qualifying Accounts	SCHEDULE II WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION VALUATION AND QUALIFYING ACCOUNTS For each of the three years ended December 31  In thousands   Balance at beginning of period   Charged/ (credited) to expense   Charged/ (credited) to other accounts (1)   Deductions from reserves (2)   Balance at end of period 2017                     Warranty and overhaul reserves   $ 138,992   $ 50,385   $ 12,234   $ 48,548   $ 153,063 Allowance for doubtful accounts   7,340   2,632   4,979   2,609   12,342 Valuation allowance-taxes   21,418   6,760   —   10,024   18,154 2016                     Warranty and overhaul reserves   $ 92,064   $ 28,947   $ 56,753   $ 38,772   $ 138,992 Allowance for doubtful accounts   5,614   3,635   —   1,909   7,340 Valuation allowance-taxes   12,623   3,405   5,390   —   21,418 2015                     Warranty and overhaul reserves   $ 87,849   $ 35,418   $ (1,762 )   $ 29,441   $ 92,064 Allowance for doubtful accounts   6,270   2,026   —   2,682   5,614 Valuation allowance-taxes   1,818   7,024   3,781   —   12,623   (1) Reserves of acquired/(sold) companies; valuation allowances for state and foreign deferred tax assets; impact of fluctuations in foreign currency exchange rates. (2) Actual disbursements and/or charges.

X

- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details Name: us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_ValuationAndQualifyingAccountsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	The consolidated financial statements include the accounts of the Company and all subsidiaries that it controls. For consolidated subsidiaries in which the Company's ownership is less than 100%, the outside shareholders' interests are shown as noncontrolling interests. These statements have been prepared in accordance with U.S. generally accepted accounting principles. Sales between subsidiaries are billed at prices consistent with sales to third parties and are eliminated in consolidation.
Cash Equivalents	Cash equivalents are highly liquid investments purchased with an original maturity of three months or less.
Allowance for Doubtful Accounts	The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence.
Inventories	Inventories are stated at the lower of cost or market. Cost is determined under the first-in, first-out (FIFO) method. Inventory costs include material, labor and overhead.
Property, Plant and Equipment	Property, plant and equipment additions are stated at cost. Expenditures for renewals and improvements are capitalized. Expenditures for ordinary maintenance and repairs are expensed as incurred. The Company computes book depreciation principally on the straight-line method. Accelerated depreciation methods are utilized for income tax purposes.
Leasing Arrangements	The Company conducts a portion of its operations from leased facilities and finances certain equipment purchases through lease agreements. In those cases in which the lease term approximates the useful life of the leased asset or the lease meets certain other prerequisites, the leasing arrangement is classified as a capital lease. The remaining arrangements are treated as operating leases.
Goodwill and Intangible Assets	Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles (with definite lives) are amortized on a straight-line basis over their estimated economic lives. Amortizable intangible assets are reviewed for impairment when indicators of impairment are present. The Company tests goodwill and indefinite-lived intangible assets for impairment at the reporting unit level and at least annually. The Company performs its annual impairment test during the fourth quarter after the annual forecasting process is completed, and also tests for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Periodically, Management of the Company assesses whether or not an indicator of impairment is present that would necessitate an impairment analysis be performed. For 2017, the Company opted to proceed directly to the two-step quantitative impairment test for all reporting units with goodwill. In the first step of the quantitative assessment, our assets and liabilities, including existing goodwill and other intangible assets, are assigned to the identified reporting units to determine the carrying value of the reporting units. The income approach and the market approach are weighted at 50% and 50%, respectively, in arriving at fair value. The discounted cash flow model requires several assumptions including future sales growth, EBIT (earnings before interest and taxes) margins and capital expenditures for the reporting units. The discounted cash flow model also requires the use of a discount rate and a terminal revenue growth rate (the revenue growth rate for the period beyond the years forecasted by the reporting units), as well as projections of future operating margins. The market approach requires several assumptions including EBITDA (earnings before interest, taxes, depreciation and amortization) multiples for comparable companies that operate in the same markets as the Company’s reporting units. The estimated fair value of all reporting units was substantially in excess of its respective carrying value, which resulted in a conclusion that no impairment existed. Additionally, the Company proceeded directly to the quantitative impairment test for some trade names with indefinite lives. The fair value of all trade names subject to the quantitative impairment test exceeded its respective carrying value, resulting in a conclusion that no impairment existed. For trade names not subject to the quantitative testing, the Company opted to perform a qualitative trade name impairment assessment and determined from the qualitative assessment that it was not more likely than not that the estimated fair values of the trade names were less than their carrying values; therefore, no further analysis was required. In assessing the qualitative factors to determine whether it is more likely than not that the fair value of a trade name is less than its carrying amount, we assess relevant events and circumstances that may impact the fair value and the carrying amount of the trade name. The identification of relevant events and circumstances and how these may impact a trade name’s fair value or carrying amount involve significant judgments and assumptions. The judgment and assumptions include the identification of macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, Wabtec specific events, share price trends and making the assessment on whether each relevant factor will impact the impairment test positively or negatively and the magnitude of any such impact.
Warranty Costs	Warranty costs are accrued based on Management’s estimates of repair or upgrade costs per unit and historical experience.
Income Taxes	Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws. The provision for income taxes includes federal, state and foreign income taxes.
Stock-Based Compensation	The Company recognizes compensation expense for stock-based compensation based on the grant date fair value amortized ratably over the requisite service period following the date of grant.
Financial Derivatives and Hedging Activities	The Company has entered into foreign currency forward contracts to reduce the impact of changes in currency exchange rates. Foreign currency forward contracts are agreements with a counterparty to exchange two distinct currencies at a set exchange rate for delivery on a set date at some point in the future. There is no exchange of funds until the delivery date.
Foreign Currency Translation	Assets and liabilities of foreign subsidiaries, except for the Company’s Mexican operations whose functional currency is the U.S. Dollar, are translated at the rate of exchange in effect on the balance sheet date while income and expenses are translated at the average rates of exchange prevailing during the period. Foreign currency gains and losses resulting from transactions, and the translation of financial statements are recorded in the Company’s consolidated financial statements based upon the provisions of Accounting Standards Codification (“ASC”) 830, “Foreign Currency Matters.” The effects of currency exchange rate changes on intercompany transactions and balances of a long-term investment nature are accumulated and carried as a component of accumulated other comprehensive loss. The effects of currency exchange rate changes on intercompany transactions that are denominated in a currency other than an entity’s functional currency are charged or credited to earnings.
Noncontrolling Interests	In accordance with ASC 810, the Company has classified noncontrolling interests as equity on our condensed consolidated balance sheets as of December 31, 2017 and 2016.
Revenue Recognition	Revenue is recognized in accordance with ASC 605 “Revenue Recognition,”  The Company recognizes revenue when the following criteria are met: 1) persuasive evidence of an arrangement exists; 2) delivery has occurred; 3) an established sales price has been set with the customer; 4) collection of the sale revenue from the customer is reasonably assured; and 5) no contingencies exist.  Delivery is considered to have occurred when the customer assumes the risk and rewards of ownership.  The Company estimates and records provisions for quantity rebates and sales returns and allowances as an offset to revenue in the same period the related revenue is recognized, based upon its experience.  These items are included as a reduction in deriving net sales. In general, the Company recognizes revenues on long-term contracts based on the percentage of completion method of accounting. The units-of-delivery method or other input-based or output-based measures, as appropriate, are used to measure the progress toward completion of individual contracts. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and adjustments are reflected in the accounting period as such amounts are determined. Provisions are made currently for estimated losses on uncompleted contracts.
Significant Customers and Concentrations of Credit Risk	The Company’s trade receivables are from rail and transit industry original equipment manufacturers, Class I railroads, railroad carriers and commercial companies that utilize rail cars in their operations, such as utility and chemical companies. No one customer accounted for more than 10% of the Company’s consolidated net sales in 2017, 2016 or 2015.
Shipping and Handling Fees and Costs	All fees billed to the customer for shipping and handling are classified as a component of net revenues. All costs associated with shipping and handling are classified as a component of cost of sales.
Research and Development	Research and development costs are charged to expense as incurred.
Earnings Per Share	Basic and diluted earnings per common share is computed in accordance with ASC 260 “Earnings Per Share.” Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and included in the computation of earnings per share pursuant to the two-class method included in ASC 260-10-55. (See Note 11 “Earnings Per Share” included herein)
Reclassifications	Certain prior year amounts have been reclassified, where necessary, to conform to the current year presentation. Refer to Recently Adopted Accounting Pronouncements below.
Use of Estimates	The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from the estimates. On an ongoing basis, Management reviews its estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.
Recently Issued Accounting Pronouncements	In March 2017, the FASB issued ASU No. 2017-07 "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost". The amendments in this update require the service cost component of net benefit costs to be reported in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented in the income statement separately from the service cost component and outside income from operations. This update also allows the service cost component to be eligible for capitalization when applicable. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption was permitted as of the beginning of an annual period. The amendments should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements.      In January 2017, the FASB issued ASU No. 2017-04 "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment". The amendments in this update eliminate the requirement to perform Step 2 of the goodwill impairment test. Instead, an entity should perform a goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value up to the carrying amount of the goodwill. The ASU is effective for public companies in the fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The impact of adopting this guidance could result in a change in the overall conclusion as to whether or not a reporting units' goodwill is impaired and the amount of an impairment charge recognized in the event a reporting units' carrying value exceeds its fair value. All of the Company's reporting units had fair values that were greater than the carrying value as of the Company's last quantitative goodwill impairment test, which was performed as of October 1, 2017. In November 2016, the FASB issued ASU No. 2016-18 "Statement of Cash Flows (Topic 230): Restricted Cash". The amendments in this update require a statement of cash flows to explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The ASU is effective for public companies in the fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of this guidance in 2018 to have a material impact on the Company's financial statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 814)" which requires lessees to recognize a right of use asset and lease liability on the balance sheet for all leases with terms longer than 12 months. For leases with terms less than 12 months, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right of use asset and lease liability. The ASU is effective for public companies in the fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contract with Customers.”  The ASU will supersede most of the existing revenue recognition requirements in U.S. GAAP and will require entities to recognize revenue at an amount that reflects the consideration to which the Company expects to be entitled in exchange for transferring goods or services to a customer.  The new standard also requires significantly expanded disclosures regarding the qualitative and quantitative information of an entity’s nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.  The Board voted to propose that the standard would take effect for reporting periods beginning after December 15, 2017 and that early adoption would be allowed as of the original effective date. The impact to results is not anticipated to be material because the analysis of the Company's current long-term contracts under the new revenue recognition standard supports the recognition of revenue over time under the cost-to-cost method for substantially all of our long-term contracts, which is consistent with our current revenue recognition model. The Company plans to adopt this accounting standard update using the modified retrospective method, with the cumulative effect of initially applying this update recognized in the first reporting period of 2018. The Company has evaluated new disclosure requirements and is implementing appropriate changes to its business processes and controls to support disclosure under the new guidance. Recently Adopted Accounting Pronouncements In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”. The ASU simplifies several aspects for the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The ASU became effective for public companies during interim and annual reporting periods beginning after December 15, 2016. In accordance with this update, the Company began recognizing all excess tax deficiencies and tax benefits from share-based payment awards as a benefit or expense to income tax in the income statement. This update has been adopted prospectively in accordance with the ASU and the impact of adoption on the income statement was not material. Additionally, in accordance with this update, the Company began classifying excess income tax benefits from exercise of stock options as an operating activity on the consolidated statement of cash flows. The Company elected to adopt this amendment retrospectively and the impact of the adoption on operating and financing cash flows was not material.

X

- References No definition available. + Details Name: us-gaap_AccountingPoliciesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -Section 05 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6375392&loc=d3e26790-107797 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details Name: us-gaap_CashAndCashEquivalentsPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for salaries, bonuses, incentive awards, postretirement and postemployment benefits granted to employees, including equity-based arrangements; discloses methodologies for measurement, and the bases for recognizing related assets and liabilities and recognizing and reporting compensation expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(f(1)) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_CompensationRelatedCostsPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for credit risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75027168&loc=d3e14489-108613 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61082-112788 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75027451&loc=SL29635902-196195 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788 + Details Name: us-gaap_ConcentrationRiskCreditRisk Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161450&loc=d3e5614-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.3A-03) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355100-122828 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.3A-02) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355033-122828 + Details Name: us-gaap_ConsolidationPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for its derivative instruments and hedging activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41675-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 + Details Name: us-gaap_DerivativesPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details Name: us-gaap_EarningsPerSharePolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details Name: us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for intangible assets. This accounting policy may address both intangible assets subject to amortization and those that are not. The following also may be disclosed: (1) a description of intangible assets (2) the estimated useful lives of those assets (3) the amortization method used (4) how the entity assesses and measures impairment of such assets (5) how future cash flows are estimated (6) how the fair values of such asset are determined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details Name: us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 05 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65884525&loc=d3e40913-109327 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 740 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32247-109318 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32280-109318 + Details Name: us-gaap_IncomeTaxPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4492-108314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4556-108314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details Name: us-gaap_InventoryPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for leasing arrangement entered into by lessee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918666-209980 + Details Name: us-gaap_LesseeLeasesPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details Name: us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for reclassifications that affects the comparability of the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755 + Details Name: us-gaap_PriorPeriodReclassificationAdjustmentDescription Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PropertyPlantAndEquipmentPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for trade and other accounts receivable, and finance, loan and lease receivables, including those classified as held for investment and held for sale. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the valuation allowance for receivables is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of origination fees and costs, including the amortization method for net deferred fees or costs (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status and (7) the treatment of foreclosures or repossessions (8) the nature and amount of any guarantees to repurchase receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10133-111534 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e4975-111524 + Details Name: us-gaap_ReceivablesPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for costs it has incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details Name: us-gaap_ResearchAndDevelopmentExpensePolicy Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 + Details Name: us-gaap_RevenueRecognitionPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for the classification of shipping and handling costs, including whether the costs are included in cost of sales or included in other income statement accounts. If shipping and handling fees are significant and are not included in cost of sales, disclosure includes both the amounts of such costs and the line item on the income statement which includes such costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82851458&loc=d3e221937-122793 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60635-111653 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68080631&loc=d3e61069-111654 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 + Details Name: us-gaap_ShippingAndHandlingCostPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for standard warranties including the methodology for measuring the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details Name: us-gaap_StandardProductWarrantyPolicy Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6061-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6143-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6132-108592 + Details Name: us-gaap_UseOfEstimates Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Non controlling interests policy. + References No definition available. + Details Name: wab_NoncontrollingInterestsPolicyPolicyTextBlock Namespace Prefix: wab_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Summary of Fair Value of Assets Acquired and Liabilities Assumed	For the Workhorse, Precision Turbo, and Unitrac acquisitions, the following table summarizes the final fair value of assets acquired and liabilities assumed at the date of acquisition.       Melett   TTC   ATP   Workhorse   Precision Turbo   Unitrac     December 4, 2017   April 5, 2017   March 13, 2017   December 14, 2016   November 17, 2016   May 5, 2016 In thousands             Current assets   $ 21,068   $ 3,746   $ 11,666   $ 9,137   $ 4,145   $ 11,476 Property, plant & equipment   5,917   5,909   5,354   —   1,317   1,768 Goodwill   22,501   16,309   29,034   22,273   4,248   2,442 Other intangible assets   39,259   12,300   25,000   21,500   5,200   1,230 Total assets acquired   88,745   38,264   71,054   52,910   14,910   16,916 Total liabilities assumed   (14,789 )   (5,753 )   (5,800 )   (9,083 )   (1,057 )   (2,145 ) Net assets acquired   $ 73,956   $ 32,511   $ 65,254   $ 43,827   $ 13,853   $ 14,771 For the Gerken acquisition, the following table summarizes the final fair value of the assets acquired and liabilities assumed at the date of the acquisition.       AM General   Gerken     October 2, 2017   August 1, 2016 In thousands     Current assets   $ 6,611   $ 32,706 Property, plant & equipment   4,140   7,667 Goodwill   12,943   17,470 Other intangible assets   12,097   30,560 Other assets —   1,706 Total assets acquired   35,791   90,109 Total liabilities assumed (25,375 )   (27,262 ) Net assets acquired   $ 10,416   $ 62,847 The following table summarizes the final fair values of the Faiveley Transport assets acquired and liabilities assumed. In thousands     Assets acquired     Cash and cash equivalents   $ 178,318 Accounts receivable   439,631 Inventories   205,649 Other current assets   70,930 Property, plant, and equipment   148,746 Goodwill   1,262,350 Trade names   346,328 Customer Relationships   233,529 Patents   1,201 Other noncurrent assets   184,564 Total assets acquired   3,071,246 Liabilities assumed     Current liabilities   819,493 Debt   409,899 Other noncurrent liabilities   335,039 Total liabilities assumed   1,564,431 Net assets acquired $ 1,506,815
Pro Forma Financial Information	The following unaudited pro forma financial information presents income statement results as if the acquisitions listed above had occurred January 1, 2016:       For the year ended December 31, In thousands   2017   2016 Net sales   $ 3,946,244   $ 4,212,617 Gross profit   1,095,101   1,275,835 Net income attributable to Wabtec shareholders   271,783   349,852 Diluted earnings per share         As Reported   $ 2.72   $ 3.34 Pro forma   $ 2.82   $ 3.83

X

- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details Name: us-gaap_BusinessAcquisitionProFormaInformationTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_BusinessCombinationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

SUPPLEMENTAL CASH FLOW DISCLOSURES (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow Disclosures	Year Ended December 31,     2017   2016   2015 In thousands             Interest paid during the year   $ 75,317   $ 30,211   $ 19,372 Income taxes paid during the year, net of amount refunded   $ 89,379   $ 121,563   $ 147,958 Business acquisitions:             Fair value of assets acquired   452,209   3,118,420   156,020 Liabilities assumed   207,788   1,453,382   20,789 Non-controlling interest (acquired) assumed   (738,024 )   760,343   — Stock and cash paid   982,445   904,695   135,231 Less: Cash acquired   35,408   186,903   5,681           Stock used for acquisition   25,500   534,679   — Net cash paid   $ 921,537   $ 183,113   $ 129,550

X

- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details Name: us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_SupplementalCashFlowElementsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Components of Inventory, Net of Reserves	The components of inventory, net of reserves, were:       December 31, In thousands   2017   2016 Raw materials   $ 378,481   $ 331,465 Work-in-progress   167,390   145,462 Finished goods   196,763   181,583 Total inventories   $ 742,634   $ 658,510

X

- References No definition available. + Details Name: us-gaap_InventoryDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_ScheduleOfInventoryCurrentTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

PROPERTY, PLANT & EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Major Classes of Depreciable Assets	The major classes of depreciable assets are as follows:     December 31, In thousands   2017   2016 Machinery and equipment   $ 728,257   $ 645,354 Buildings and improvements   259,561   225,307 Land and improvements   38,228   41,569 Property, plant and equipment   1,026,046   912,230 Less: accumulated depreciation   (452,074 )   (393,854 ) Total   $ 573,972   $ 518,376
Estimated Useful Lives of Property Plant and Equipment	The estimated useful lives of property, plant and equipment are as follows:   Years Land improvements 10 to 20 Building and improvements 20 to 40 Machinery and equipment 3 to 15

X

- References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PropertyPlantAndEquipmentTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Schedule Of Estimated Useful Lives Of Property Plant And Equipment Table + References No definition available. + Details Name: wab_ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTableTextBlock Namespace Prefix: wab_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

INTANGIBLES (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Change in the Carrying Amount of Goodwill by Segment	The change in the carrying amount of goodwill by segment for the year ended December 31, 2017 is as follows:     Freight   Transit     In thousands   Segment   Segment   Total Balance at December 31, 2016   $ 550,902   $ 1,527,863   $ 2,078,765 Additions   152,096   34,391   186,487 Foreign currency impact   15,960   178,891   194,851 Balance at December 31, 2017   $ 718,958   $ 1,741,145   $ 2,460,103
Intangible Assets of the Company, Other Than Goodwill and Trademarks	Intangible assets of the Company, other than goodwill and trade names, consist of the following:     December 31, In thousands   2017   2016 Patents, non-compete and other intangibles, net of accumulated         amortization of $43,021 and $40,638   $ 17,554   $ 15,360 Customer relationships, net of accumulated amortization         of $126,824 and $87,334   583,459   528,068 Total   $ 601,013   $ 543,428
Estimated Amortization Expense Five Succeeding Years	Estimated amortization expense for the five succeeding years is as follows (in thousands): 2018 $ 38,059 2019 36,076 2020 34,050 2021 33,777 2022 33,489

X

- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details Name: us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details Name: us-gaap_ScheduleOfGoodwillTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

LONG-TERM DEBT (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following:     December 31, In thousands   2017   2016 3.45% Senior Notes due 2026, net of unamortized debt issuance costs of $2,345 and $2,526   $ 747,655   $ 747,474 4.375% Senior Notes due 2023, net of unamortized discount and debt issuance costs of $1,433 and $1,690   248,567   248,310 Revolving Credit Facility and Term Loan, net of unamortized debt issuance costs of $2,451 and $3,850   853,124   796,150 Schuldschein Loan   11,998   98,671 Other Borrowings   6,860   1,153 Capital Leases   2,324   1,018 Total   1,870,528   1,892,776 Less - current portion   47,225   129,809 Long-term portion   $ 1,823,303   $ 1,762,967
Principal Repayments of Debt and Capital Lease	Scheduled principal repayments of debt and capital lease balances as of December 31, 2017 are as follows:       2018 $ 47,225 2019 330,901 2020 559 2021 483,379 2022 208 Future years 1,008,256 Total $ 1,870,528

X

- References No definition available. + Details Name: us-gaap_DebtDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details Name: us-gaap_ScheduleOfDebtInstrumentsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details Name: us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Schedule of U.S. and International Pension Plans with Accumulated Benefit Obligations and with Projected Benefit Obligations in Excess of Plan Assets	U.S.   International In thousands   2017   2016   2017   2016 Information for pension plans with accumulated benefit obligations in                 excess of Plan assets:                 Projected benefit obligation   $ (44,213 )   $ (45,512 )   $ (282,077 )   $ (255,682 ) Accumulated benefit obligation   (43,340 )   (44,530 )   (274,557 )   (249,729 ) Fair value of plan assets   37,432   35,802   200,218   170,367 Information for pension plans with projected benefit obligations in                 excess of plan assets:                 Projected benefit obligation   $ (44,213 )   $ (45,512 )   $ (283,106 )   $ (256,530 ) Fair value of plan assets   37,432   35,802   201,115   171,133
Pension Plan Assets by Asset Category	Plan assets by asset category at December 31, 2017 and 2016 are as follows:     U.S.   International In thousands   2017   2016   2017   2016 Pension Plan Assets                 Equity security funds   $ 18,122   $ 17,446   $ 100,453   $ 92,201 Debt security funds and other   18,304   17,038   178,730   145,003 Cash and cash equivalents   1,006   1,318   2,419   4,079 Fair value of plan assets   $ 37,432   $ 35,802   $ 281,602   $ 241,283
Schedule of Pension Plan Assets Measured at Fair Value	The following tables summarize our pension plan assets measured at fair value on a recurring basis by fair value hierarchy level (See Note 18):     December 31, 2017 In thousands   NAV   Level 1   Level 2   Level 3   Total US:                     Equity   $ —   $ 18,122   $ —   $ —   $ 18,122 Debt Securities   —   4,273   14,031   —   18,304 Cash and cash equivalents   —   1,006   —   —   1,006 International:                     Equity   $ 4,586   $ 38,647   $ 95,641   $ —   $ 138,874 Debt Securities   —   —   111,204   —   111,204 Insurance Contracts   —   —   15,893   13,123   29,016 Cash and cash equivalents   —   2,507   —   —   2,507 Total   $ 4,586   $ 64,555   $ 236,769   $ 13,123   $ 319,033     December 31, 2016 In thousands   NAV   Level 1   Level 2   Level 3   Total US:                     Equity   $ —   $ 17,446   $ —   $ —   $ 17,446 Debt Securities   —   4,766   12,272   —   17,038 Cash and cash equivalents   —   1,318   —   —   1,318 International:                     Equity   $ 3,589   $ 38,053   $ 78,694   $ —   $ 120,336 Debt Securities   —   —   90,508   —   90,508 Insurance Contracts   —   —   13,037   12,996   26,033 Cash and cash equivalents   —   4,406   —   —   4,406 Total   $ 3,589   $ 65,989   $ 194,511   $ 12,996   $ 277,085
Schedule of Reconciliation of Level 3 Assets	The following table presents a reconciliation of Level 3 assets: In thousands   Total Balance at December 31, 2015   $ — Net purchases, issuances, and settlements   56 Net realized and unrealized gains (losses) included in earnings   (5 ) Business acquisition   12,949 Other   (4 ) Balance at December 31, 2016   $ 12,996 Net purchases, issuances, and settlements   778 Net realized and unrealized gains (losses) included in earnings   375 Opening balance sheet adjustment   (1,308 ) Other   282 Balance at December 31, 2017   $ 13,123
Costs Recognized Under Defined Contribution Plans and Multiemployer Pension Plans	Costs recognized under these plans are summarized as follows:     For the year ended December 31, In thousands   2017   2016   2015 Multi-employer pension and health & welfare plans   $ 1,522   $ 2,054   $ 2,584 401(k) savings and other defined contribution plans   23,209   23,062   21,399 Total   $ 24,731   $ 25,116   $ 23,983
Contributions in Multiemployer Pension Plans	The Company’s participation in multi-employer plans for the year ended December 31, 2017 is outlined in the table below. For plans that are not individually significant to the Company, the total amount of contributions is presented in the aggregate.           Pension Protection Act Zone Status (b)   FIP/   Contributions by the Company           Expiration Dates of                   RP Status Pending/                           Surcharge Imposed   Collective Bargaining Pension Fund   EIN/PN (a)   2016   2015   Implemented (c)   2017       2016       2015       (d)   Agreements Idaho Operating Engineers-   EIN # 91-6075538   Green   Green   No   $ 1,020   (1)   $ 1,306   (1 )   $ 1,820   (1 )   No   6/30/2018 Employers Pension Trust Fund   Plan# 001                                             Automobile Mechanics' Local No 701 Union and   EIN # 36-6042061   Yellow   Red   Yes (2)   $ 501   (3)   $ 748       $ 764       No (4)   6/1/2018 Industry Pension Plan   Plan # 001                                                               Total Contributions   $ 1,521       $ 2,054       $ 2,584               (1) The Company’s contribution represents more than 5% of the total contributions to the plan. (2) The Pension Fund’s board adopted a Funding Improvement Plan on October 21, 2015, continuing the existing plan which increased the weekly pension fund contribution rates by $75 with corresponding decreases to the weekly welfare fund contribution rates until December 31, 2017. (3) The number of employees covered by this fund decreased due to the closure of the Bensenville, Illinois facility, which affected the period-to-period comparability of 2016 and 2017 contributions. (4) Critical status triggered a 5% surcharge on employer contributions effective June 2012.  Effective January 1, 2013, this surcharge increases to 10%. The surcharge ended on October 21, 2015 when the rehabilitation plan commenced. (a) The “EIN / PN” column provides the Employer Identification Number and the three-digit plan number assigned to a plan by the Internal Revenue Service. (b) The most recent Pension Protection Act Zone Status available for 2017 and 2016 is for plan years that ended in 2016 and 2015, respectively. The zone status is based on information provided to the Company and other participating employers by each plan and is certified by the plan’s actuary. A plan in the “red” zone has been determined to be in “critical status”, based on criteria established under the Internal Revenue Code (“Code”), and is generally less than 65% funded. A plan in the “yellow” zone has been determined to be in “endangered status”, based on criteria established under the Code, and is generally less than 80% funded. A plan in the “green” zone has been determined to be neither in “critical status” nor in “endangered status”, and is generally at least 80% funded. (c) The “FIP/RP Status Pending/Implemented” column indicates whether a Funding Improvement Plan, as required under the Code to be adopted by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” zone, is pending or has been implemented as of the end of the plan year that ended in 2017. (d) The “Surcharge Imposed” column indicates whether the Company’s contribution rate for 2017 included an amount in addition the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical status”, in accordance with the requirements of the Code.
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Obligations and Funded Status	The following tables provide information regarding the Company’s defined benefit pension plans summarized by U.S. and international components. Obligations and Funded Status     U.S.   International In thousands   2017   2016   2017   2016 Change in projected benefit obligation                 Obligation at beginning of year   $ (45,512 )   $ (46,120 )   $ (319,551 )   $ (195,311 ) Opening balance sheet adjustment   —   —   (5,321 )   — Service cost   (344 )   (337 )   (2,740 )   (1,379 ) Interest cost   (1,422 )   (1,475 )   (7,310 )   (5,774 ) Employee contributions   —   —   (880 )   (195 ) Plan curtailments and amendments   —   —   4,153   2,061 Benefits paid   3,079   3,893   12,906   9,427 Acquisition   —   —   —   (114,242 ) Actuarial gain (loss)   (14 )   (1,473 )   (3,009 )   (33,330 ) Effect of currency rate changes   —   —   (31,265 )   19,192 Obligation at end of year   $ (44,213 )   $ (45,512 )   $ (353,017 )   $ (319,551 ) Change in plan assets                 Fair value of plan assets at beginning of year   $ 35,802   $ 37,640   $ 241,283   $ 168,069 Opening balance sheet adjustment   —   —   2,058   — Actual return on plan assets   4,223   2,055   19,102   20,066 Employer contributions   486   —   13,479   6,933 Employee contributions   —   —   880   195 Benefits paid   (3,079 )   (3,893 )   (12,905 )   (9,427 ) Acquisition   —   —   —   70,519 Settlements           (4,523 )     Effect of currency rate changes   —   —   22,228   (15,072 ) Fair value of plan assets at end of year   $ 37,432   $ 35,802   $ 281,602   $ 241,283 Funded status                 Fair value of plan assets   $ 37,432   $ 35,802   $ 281,602   $ 241,283 Benefit obligations   (44,213 )   (45,512 )   (353,017 )   (319,551 ) Funded status   $ (6,781 )   $ (9,710 )   $ (71,415 )   $ (78,268 ) Amounts recognized in the statement of financial position consist of:                 Noncurrent assets   $ —   $ —   $ 10,577   $ 7,130 Current liabilities   —   —   (2,158 )   (2,042 ) Noncurrent liabilities   (6,781 )   (9,710 )   (79,834 )   (83,356 ) Net amount recognized   $ (6,781 )   $ (9,710 )   $ (71,415 )   $ (78,268 ) Amounts recognized in accumulated other comprehensive income (loss) consist of:                 Prior service cost   (6 )   (8 )   (32 )   (56 ) Net actuarial loss   (20,418 )   (23,884 )   (54,043 )   (56,411 ) Net amount recognized   $ (20,424 )   $ (23,892 )   $ (54,075 )   $ (56,467 )
Components of Net Periodic Benefit Costs	Components of Net Periodic Benefit Costs     U.S.   International In thousands   2017   2016   2015   2017   2016   2015 Service cost   $ 344   $ 337   $ 381   $ 2,740   $ 1,379   $ 2,015 Interest cost   1,422   1,475   1,914   7,310   5,774   7,091 Expected return on plan assets   (1,731 )   (2,076 )   (2,168 )   (12,412 )   (9,971 )   (9,591 ) Amortization of initial net obligation and prior service cost   3   3   3   27   61   212 Amortization of net loss   989   914   1,062   2,846   1,818   2,379 Settlement and curtailment losses recognized   —   —   —   768   218   — Net periodic benefit cost   $ 1,027   $ 653   $ 1,192   $ 1,279   $ (721 )   $ 2,106
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income	Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows: In thousands   U.S.   International Net gain (loss) arising during the year   $ 2,477   $ 3,683 Effect of exchange rates   —   (4,945 ) Amortization, settlement, or curtailment recognition of net transition obligation   —   768 Amortization or curtailment recognition of prior service cost   3   27 Amortization or settlement recognition of net loss   989   2,846 Total recognized in other comprehensive gain   $ 3,469   $ 2,379 Total recognized in net periodic benefit cost and other comprehensive gain   $ 2,442   $ 1,100
Weighted Average Assumptions Used to Develop Actuarial Present Value of Projected Benefit Obligation	The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed.     U.S.   International     2017   2016   2015   2017   2016   2015 Discount rate   3.56 %   3.95 %   4.21 %   2.40 %   2.51 %   3.56 % Expected return on plan assets   4.95 %   5.70 %   5.70 %   5.02 %   6.07 %   5.81 % Rate of compensation increase   3.00 %   3.00 %   3.00 %   2.54 %   2.54 %   3.10 %
Amounts Included in Other Comprehensive Loss That are Expected to be Recognized as Components of Periodic Benefit Costs	As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018. In thousands   U.S.   International Prior service cost   3   22 Net actuarial loss   970   2,193     $ 973   $ 2,215
Benefit Payments Expected to be Paid to Plan Participants	Benefit payments expected to be paid to plan participants are as follows: In thousands   U.S.   International Year ended December 31,         2018   $ 3,250   $ 12,401 2019   3,301   12,403 2020   3,325   13,156 2021   3,160   13,799 2022   3,125   14,538 2023 through 2027   14,276   77,817
Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Obligations and Funded Status	The following tables provide information regarding the Company’s post retirement benefit plans summarized by U.S. and international components. Obligations and Funded Status     U.S.   International In thousands   2017   2016   2017   2016 Change in projected benefit obligation                 Obligation at beginning of year   $ (11,876 )   $ (12,959 )   $ (3,425 )   $ (3,290 ) Service cost   (5 )   (4 )   (28 )   (29 ) Interest cost   (350 )   (389 )   (98 )   (99 ) Plan amendments   —   6   —   — Benefits paid   970   720   199   133 Acquisition —   (143 )   —   — Actuarial gain (loss)   (84 )   893   (131 )   (42 ) Effect of currency rate changes   —   —   (237 )   (98 ) Obligation at end of year   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,425 ) Change in plan assets                 Fair value of plan assets at beginning of year   $ —   $ —   $ —   $ — Employer contributions   970   720   199   133 Benefits paid   (970 )   (720 )   (199 )   (133 ) Fair value of plan assets at end of year   $ —   $ —   $ —   $ — Funded status                 Fair value of plan assets   $ —   $ —   $ —   $ — Benefit obligations   (11,345 )   (11,876 )   (3,720 )   (3,425 ) Funded status   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,425 )     U.S.   International In thousands   2017   2016   2017   2016 Amounts recognized in the statement of financial position consist of:                 Current liabilities   $ (1,046 )   $ (1,084 )   $ (208 )   $ (185 ) Noncurrent liabilities   (10,299 )   (10,792 )   (3,512 )   (3,160 ) Net amount recognized   $ (11,345 )   $ (11,876 )   $ (3,720 )   $ (3,345 ) Amounts recognized in accumulated other comprehensive income (loss)                 consist of:                 Prior service credit   19,616   21,134   9   15 Net actuarial (loss) gain   (18,882 )   (20,023 )   154   292 Net amount recognized   $ 734   $ 1,111   $ 163   $ 307
Components of Net Periodic Benefit Costs	Components of Net Periodic Benefit Cost     U.S.   International In thousands   2017   2016   2015   2017   2016   2015 Service cost   $ 5   $ 4   $ 9   $ 28   $ 29   $ 38 Interest cost   350   389   1,233   98   99   128 Amortization of initial net obligation and prior service cost   (1,519 )   (1,709 )   (2,295 )   (7 )   (7 )   (7 ) Amortization of net loss (gain)   1,225   1,287   1,356   (23 )   (29 )   (30 ) Net periodic benefit cost (credit)   $ 61   $ (29 )   $ 303   $ 96   $ 92   $ 129
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income	Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income during 2017 are as follows: In thousands   U.S.   International Net loss arising during the year   (84 )   (131 ) Effect of exchange rates   —   16 Amortization or curtailment recognition of prior service cost   (1,519 )   (7 ) Amortization or settlement recognition of net loss (gain)   1,225   (23 ) Total recognized in other comprehensive income (loss)   $ (378 )   $ (145 ) Total recognized in net periodic benefit cost and other comprehensive income (loss)   $ (317 )   $ (53 )
Weighted Average Assumptions Used to Develop Actuarial Present Value of Projected Benefit Obligation	The weighted average assumptions in the following table represent the rates used to develop the actuarial present value of the projected benefit obligation for the year listed and also the net periodic benefit cost for the following year. The discount rate is based on settling the pension obligation with high grade, high yield corporate bonds.     U.S.   International     2017   2016   2015   2017   2016   2015 Discount rate   3.43 %   3.76 %   3.95 %   3.21 %   3.46 %   3.80 %
Amounts Included in Other Comprehensive Loss That are Expected to be Recognized as Components of Periodic Benefit Costs	As of December 31, 2017, the following table represents the amounts included in other comprehensive loss that are expected to be recognized as components of periodic benefit costs in 2018. In thousands   U.S.   International Prior service credit   (1,519 )   (7 ) Net actuarial loss (gain)   1,216   (8 )     $ (303 )   $ (15 )
Benefit Payments Expected to be Paid to Plan Participants	Benefit payments expected to be paid to plan participants are as follows: In thousands   U.S.   International Year ended December 31,         2018   $ 1,046   $ 208 2019   1,024   220 2020   986   225 2021   950   245 2022   908   251 2023 through 2027   3,956   1,352

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details Name: us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfAssumptionsUsedTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details Name: us-gaap_ScheduleOfDefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_ScheduleOfMultiemployerPlansTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_ScheduleOfNetBenefitCostsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Schedule of defined contribution plans and multiemployer pension plans. + References No definition available. + Details Name: wab_ScheduleOfDefinedContributionPlansAndMultiemployerPensionPlansTableTableTextBlock Namespace Prefix: wab_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Income from Operations before Provision for Income Taxes	The components of the income from operations before provision for income taxes for the Company’s domestic and foreign operations for the years ended December 31 are provided below:     For the year ended December 31, In thousands   2017   2016   2015 Domestic   $ 140,325   $ 276,218   $ 461,394 Foreign   211,738   136,619   123,974 Income from operations before income taxes   $ 352,063   $ 412,837   $ 585,368
Consolidated Provision for Income Taxes	The consolidated provision for income taxes included in the Statement of Income consisted of the following:     For the year ended December 31, In thousands   2017   2016   2015 Current taxes             Federal   $ 86,157   $ 72,317   $ 141,245 State   3,644   9,953   16,072 Foreign   67,395   27,391   24,442     157,196   109,661   181,759 Deferred taxes             Federal   (22,863 )   11,013   9,606 State   (1,024 )   1,953   770 Foreign   (43,536 )   (23,194 )   (5,395 )     (67,423 )   (10,228 )   4,981 Total provision   $ 89,773   $ 99,433   $ 186,740
Reconciliation of Income Tax Rate	A reconciliation of the United States federal statutory income tax rate to the effective income tax rate on operations for the years ended December 31 is provided below:     For the year ended December 31, In thousands   2017   2016   2015 U.S. federal statutory rate   35.0  %   35.0  %   35.0  % State taxes   0.4  %   2.1  %   2.0  % Tax reserves   —  %   (0.2 )%   (0.4 )% Foreign   (8.3 )%   (4.3 )%   (2.1 )% Research and development credit   (0.8 )%   (1.0 )%   (0.4 )% Manufacturing deduction   (1.1 )%   (1.8 )%   (2.3 )% France tax rate change   (6.5 )%   (6.5 )%   —  % U.S. tax rate change   (7.9 )%   —  %   —  % U.S. tax reform provision   15.6  %   —  %   —  % Transaction costs related to acquisitions   —  %   1.5  %   —  % Other, net   (0.9 )%   (0.7 )%   0.1  % Effective rate   25.5  %   24.1  %   31.9  %
Components of Deferred Tax Assets and Liabilities	Components of deferred tax assets and liabilities were as follows:     December 31, In thousands   2017   2016 Deferred income tax assets:         Accrued expenses and reserves   $ 10,961   $ 26,117 Warranty reserve   20,211   24,131 Deferred compensation/employee benefits   18,353   25,755 Pension and postretirement obligations   21,637   25,595 Inventory   19,620   22,579 Net operating loss carry forwards   65,671   59,416 Tax credit carry forwards   1,921   621 Other   13,053   2,317 Gross deferred income tax assets   171,427   186,531 Valuation allowance   25,683   21,418 Total deferred income tax assets   145,744   165,113 Deferred income tax liabilities:         Property, plant & equipment   37,015   47,321 Intangibles   288,141   359,312 Total deferred income tax liabilities   325,156   406,633 Net deferred income tax liability   $ (179,412 )   $ (241,520 )
Liability for Income Taxes Associated with Uncertain Tax Positions	A reconciliation of the beginning and ending amount of the liability for income taxes associated with unrecognized tax benefits follows: In thousands   2017   2016   2015 Gross liability for unrecognized tax benefits at beginning of year   $ 8,423   $ 10,557   $ 12,596 Gross increases - unrecognized tax benefits in prior periods   2,466   6   — Gross increases - current period unrecognized tax benefits   —   —   1,682 Gross decreases - unrecognized tax benefits in prior periods   —   —   — Gross decreases - audit settlement during year   (3,979 )   —   (3,027 ) Gross decreases - expiration of audit statute of limitations   —   (2,140 )   (694 ) Gross liability for unrecognized tax benefits at end of year   $ 6,910   $ 8,423   $ 10,557

X

- References No definition available. + Details Name: us-gaap_IncomeTaxDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details Name: us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details Name: us-gaap_SummaryOfIncomeTaxContingenciesTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation of Earnings Per Share	The computation of earnings per share from operations is as follows:     For the Year Ended December 31, In thousands, except per share data   2017   2016   2015 Numerator             Numerator for basic and diluted earnings per common share - net income attributable             to Wabtec shareholders   $ 262,261   $ 304,887   $ 398,628 Less: dividends declared - common shares and non-vested restricted stock   (42,218 )   (32,430 )   (26,963 ) Undistributed earnings   220,043   272,457   371,665 Percentage allocated to common shareholders (1)   99.7 %   99.7 %   99.7 %     219,383   271,640   370,550 Add: dividends declared - common shares   42,092   32,333   26,875 Numerator for basic and diluted earnings per common share   $ 261,475   $ 303,973   $ 397,425 Denominator             Denominator for basic earnings per common share - weighted average shares   95,453   90,359   96,074 Effect of dilutive securities:             Assumed conversion of dilutive stock-based compensation plans   672   782   932 Denominator for diluted earnings per common share - adjusted weighted average             shares and assumed conversion   96,125   91,141   97,006 Net income per common share attributable to Wabtec shareholders             Basic   $ 2.74   $ 3.37   $ 4.14 Diluted   $ 2.72   $ 3.34   $ 4.10               (1) Basic weighted-average common shares outstanding   95,453   90,359   96,074 Basic weighted-average common shares outstanding and non-vested restricted             stock expected to vest   95,740   90,627   96,388 Percentage allocated to common shareholders   99.7 %   99.7 %   99.7 %

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

STOCK-BASED COMPENSATION PLANS (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Activity	The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and Directors Plan for the years ended December 31:      Options   Weighted Average Exercise Price   Weighted Average Remaining Contractual Life   Aggregate Intrinsic value (in thousands) Outstanding at December 31, 2014   1,147,558   $ 28.33   5.5   $ 67,205 Granted   84,675   87.35       1,375 Exercised   (124,156 )   26.70       (5,516 ) Canceled   (10,754 )   65.22       (64 ) Outstanding at December 31, 2015   1,097,323   $ 32.70   4.8   $ 42,154 Granted   94,115   61.39       2,035 Exercised   (83,790 )   25.58       (4,813 ) Canceled   (8,825 )   71.47       (102 ) Outstanding at December 31, 2016   1,098,823   $ 35.39   4.3   $ 52,332 Granted   65,522   86.91       — Exercised   (166,838 )   21.37       (10,020 ) Canceled   (13,995 )   76.89       (64 ) Outstanding at December 31, 2017   983,512   $ 40.62   4.0   $ 40,137 Exercisable at December 31, 2017   802,609   $ 32.52   3.3   $ 36,848
Stock Options Outstanding	Options outstanding at December 31, 2017 were as follows:      Number of Options   Weighted Average Exercise Price of Options   Weighted Average Remaining Contractual   Number of Options Currently   Weighted Average Exercise Price of Options Currently Range of exercise prices   Outstanding   Outstanding   Life   Exercisable   Exercisable Under $15.00   180,000   $ 14.50   1.1   180,000   $ 14.50 15.00 - 23.00   193,701   18.77   1.3   193,701   18.77 23.00 - 30.00   136,924   28.75   2.8   136,924   28.75 30.00 - 38.00   94,496   35.24   4.1   94,496   35.24 Over 38.00   378,391   69.86   7.0   197,488   63.72     983,512   $ 40.62       802,609   $ 32.52
Schedule of Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions	The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:      For the year ended December 31,     2017   2016   2015 Dividend yield   0.23 %   0.26 %   0.14 % Risk-free interest rate   2.2 %   1.5 %   1.8 % Stock price volatility   23.4 %   26.9 %   27.3 % Expected life (years)   5.0   5.0   5.0 Weighted average fair value of options granted during the year   $ 20.69   $ 14.96   $ 24.41
Restricted Stock Activity and Incentive Stock Awards Activity	The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the years ended December 31:      Restricted Stock and Units   Incentive Stock Awards   Weighted Average Grant Date Fair Value Outstanding at December 31, 2014   438,543   791,608   $ 47.97 Granted   113,945   126,050   87.90 Vested   (182,776 )   (433,932 )   37.76 Adjustment for incentive stock awards expected to vest   —   65,666   57.57 Canceled   (12,827 )   (7,754 )   67.05 Outstanding at December 31, 2015   356,885   541,638   $ 65.89 Granted   212,600   167,850   66.03 Vested   (159,975 )   (236,591 )   51.80 Adjustment for incentive stock awards expected to vest   —   (38,164 )   74.42 Canceled   (13,215 )   (9,983 )   71.84 Outstanding at December 31, 2016   396,295   424,750   $ 72.18 Granted   153,516   157,025   86.66 Vested   (137,088 )   (153,271 )   70.34 Adjustment for incentive stock awards expected to vest   —   (87,592 )   73.69 Canceled   (13,723 )   (13,579 )   76.61 Outstanding at December 31, 2017   399,000   327,333   $ 78.76

X

- References No definition available. + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Schedule of restricted stock activity and incentive stock awards activity. + References No definition available. + Details Name: wab_ScheduleOfRestrictedStockActivityAndIncentiveStockAwardsActivityTableTableTextBlock Namespace Prefix: wab_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss were:     December 31, In thousands   2017   2016 Foreign currency translation gain (loss)   $ 5,063   $ (321,033 ) Unrealized gain (loss) on interest rate swap contracts, net of tax of $1,338 and $1,540   4,015   (2,957 ) Unrealized loss on pension and post-retirement benefit plans, net of tax of $19,532 and $20,832   (54,070 )   (55,615 ) Total accumulated other comprehensive loss   $ (44,992 )   $ (379,605 )
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax	The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2016 are as follows:     Foreign currency   Derivative   Pension and post retirement     In thousands   translation   contracts   benefits plans   Total Balance at December 31, 2015   $ (227,349 )   $ (2,987 )   $ (46,383 )   $ (276,719 ) Other comprehensive income before reclassifications   (93,684 )   (1,286 )   (10,874 )   (105,844 ) Amounts reclassified from accumulated other                 comprehensive income   —   1,316   1,642   2,958 Net current period other comprehensive income   (93,684 )   30   (9,232 )   (102,886 ) Balance at December 31, 2016   $ (321,033 )   $ (2,957 )   $ (55,615 )   $ (379,605 ) The changes in accumulated other comprehensive loss by component, net of tax, for the year-ended December 31, 2017 are as follows:       Foreign currency   Derivative   Pension and post retirement     In thousands   translation   contracts   benefits plans   Total Balance at December 31, 2016   $ (321,033 )   $ (2,957 )   $ (55,615 )   $ (379,605 ) Other comprehensive income before reclassifications   326,096   6,712   (1,017 )   331,791 Amounts reclassified from accumulated other                 comprehensive income   —   260   2,562   2,822 Net current period other comprehensive income   326,096   6,972   1,545   334,613 Balance at December 31, 2017   $ 5,063   $ 4,015   $ (54,070 )   $ (44,992 )
Reclassifications Out of Accumulated Other Comprehensive Loss	Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2016 are as follows:      Amount reclassified from accumulated other   Affected line item in the Condensed Consolidated In thousands   comprehensive income   Statements of Income Amortization of defined pension and post retirement items         Amortization of initial net obligation and prior service cost   $ (1,652 )   Cost of sales Amortization of net loss (gain)   3,989   Cost of sales     2,337   Income from Operations     (695 )   Income tax expense     $ 1,642   Net income Derivative contracts         Realized loss on derivative contracts   1,873   Interest expense, net     (557 )   Income tax expense     $ 1,316   Net income Reclassifications out of accumulated other comprehensive loss for the year-ended December 31, 2017 are as follows:      Amount reclassified from accumulated other   Affected line item in the Condensed Consolidated In thousands   comprehensive income   Statements of Income Amortization of defined pension and post retirement items         Amortization of initial net obligation and prior service cost   $ (1,496 )   Cost of sales Amortization of net loss (gain)   5,037   Cost of sales     3,541   Income from Operations     (979 )   Income tax expense     $ 2,562   Net income Derivative contracts         Realized loss on derivative contracts   400   Interest expense, net     (140 )   Income tax expense     $ 260   Net income

X

- References No definition available. + Details Name: us-gaap_EquityAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details Name: us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details Name: us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

OPERATING LEASES (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Future Minimum Rental Payments Under Operating Leases	Future minimum rental payments under operating leases with remaining non-cancelable terms in excess of one year are as follows:     Real         In thousands   Estate   Equipment   Total 2018   $ 28,957   $ 2,690   $ 31,647 2019   25,857   1,925   27,782 2020   24,266   976   25,242 2021   19,561   512   20,073 2022   16,350   271   16,621 2023 and after   66,017   24   66,041

X

- References No definition available. + Details Name: us-gaap_LeasesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details Name: us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

WARRANTIES (Tables)	12 Months Ended
	Dec. 31, 2017
Product Warranties Disclosures [Abstract]
Changes in Product Warranty Reserve	The following table reconciles the changes in the Company’s product warranty reserve as follows: In thousands   2017   2016 Balance at beginning of year   $ 138,992   $ 92,064 Warranty expense   50,385   28,947 Acquisitions   806   59,685 Warranty claim payments   (48,548 )   (38,772 ) Foreign currency impact   11,428   (2,932 ) Balance at end of year   $ 153,063   $ 138,992

X

- References No definition available. + Details Name: us-gaap_ProductWarrantiesDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details Name: us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Notional Amounts and Fair Value	The following table summarizes the gross notional amounts and fair values of the designated and non-designated hedged discussed in the above sections: In millions   Designated   Non-Designated   Total Gross notional amount   $ 805.1   $ 379.7   $ 1,184.8               Fair Value:             Other current assets   3.5   2.1   5.6 Other current liabilities   —   —   — Total   $ 3.5   $ 2.1   $ 5.6

X

- References No definition available. + Details Name: us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details Name: us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Liabilities Carried at Fair Value Measured on Recurring Basis	The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2017, which are included in other current liabilities on the Consolidated Balance sheet:          Fair Value Measurements at December 31, 2017 Using     Total Carrying Value at December 31,   Quoted Prices in Active Markets for Identical Assets   Significant Other Observable Inputs   Significant Unobservable Inputs In thousands   2017   (Level 1)   (Level 2)   (Level 3) Interest rate swap agreements   1,163   —   1,163   — Total   $ 1,163   $ —   $ 1,163   $ — The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2016, which are included in other current liabilities on the Consolidated Balance sheet:          Fair Value Measurements at December 31, 2016 Using     Total Carrying Value at December 31,   Quoted Prices in Active Markets for Identical Assets   Significant Other Observable Inputs   Significant Unobservable Inputs In thousands   2016   (Level 1)   (Level 2)   (Level 3) Interest rate swap agreements   3,888   —   3,888   — Total   $ 3,888   $ —   $ 3,888   $ —
Estimated Fair Values and Related Carrying Values of Financial Instruments	The estimated fair values and related carrying values of the Company’s financial instruments are as follows:     December 31, 2017   December 31, 2016     Carry   Fair   Carry   Fair In thousands   Value   Value   Value   Value Interest rate swap agreements   $ 1,163   $ 1,163   $ 3,888   $ 3,888 4.375% Senior Notes   248,567   262,033   248,310   260,265 3.45% Senior Notes   747,655   741,113   747,474   719,273

X

- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details Name: us-gaap_FairValueByBalanceSheetGroupingTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_FairValueDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details Name: us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Financial Information	Segment financial information for 2017 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 1,396,588   $ 2,485,168   $ —   $ 3,881,756 Intersegment sales/(elimination)   37,630   21,548   (59,178 )   — Total sales   $ 1,434,218   $ 2,506,716   $ (59,178 )   $ 3,881,756 Income (loss) from operations   $ 264,603   $ 188,546   $ (31,416 )   $ 421,733 Interest expense and other, net   —   —   (69,670 )   (69,670 ) Income (loss) from operations before income taxes   $ 264,603   $ 188,546   $ (101,086 )   $ 352,063 Depreciation and amortization   $ 43,721   $ 57,441   $ 2,086   $ 103,248 Capital expenditures   33,921   50,762   4,783   89,466 Segment assets   3,504,289   7,562,122   (4,486,431 )   6,579,980                   Segment financial information for 2016 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 1,543,098   $ 1,388,090   $ —   $ 2,931,188 Intersegment sales/(elimination)   39,519   9,393   (48,912 )   $ — Total sales   $ 1,582,617   $ 1,397,483   $ (48,912 )   $ 2,931,188 Income (loss) from operations   $ 344,455   $ 171,446   $ (57,540 )   $ 458,361 Interest expense and other, net   —   —   (45,524 )   (45,524 ) Income (loss) from operations before income taxes   $ 344,455   $ 171,446   $ (103,064 )   $ 412,837 Depreciation and amortization   $ 36,519   $ 31,545   $ 1,731   $ 69,795 Capital expenditures   22,726   20,987   6,503   50,216 Segment assets   2,949,668   6,720,302   (3,088,952 )   6,581,018 Segment financial information for 2015 is as follows:                             Corporate         Freight   Transit   Activities and     In thousands   Segment   Segment   Elimination   Total Sales to external customers   $ 2,054,715   $ 1,235,283   $ —   $ 3,307,998 Intersegment sales/(elimination)   35,372   10,895   (46,267 )   — Total sales   $ 2,090,087   $ 1,264,178   $ (46,267 )   $ 3,307,998 Income (loss) from operations   $ 482,640   $ 150,988   $ (26,061 )   $ 607,567 Interest expense and other, net   —   —   (22,199 )   (22,199 ) Income (loss) from operations before income taxes   $ 482,640   $ 150,988   $ (48,260 )   $ 585,368 Depreciation and amortization   $ 36,834   $ 26,196   $ 1,704   $ 64,734 Capital expenditures   24,715   22,996   1,717   49,428 Segment assets   2,708,724   2,202,614   (1,681,825 )   3,229,513
Geographic Area Data	The following geographic area data as of and for the years ended December 31, 2017, 2016 and 2015, respectively, includes net sales based on product shipment destination and long-lived assets, which consist of plant, property and equipment, net of depreciation, resident in their respective countries:     Net Sales   Long-Lived Assets In thousands   2017   2016   2015   2017   2016   2015 United States   $ 1,323,781   $ 1,362,255   $ 1,754,924   $ 211,608   $ 205,895   $ 171,362 United Kingdom   356,493   322,563   368,505   57,668   54,215   63,694 Canada   279,013   206,258   204,674   5,822   5,156   4,876 France   237,454   66,287   45,565   57,849   33,636   7,194 Germany   208,817   98,364   92,422   71,709   57,902   31,642 China   178,137   106,357   100,586   36,388   42,672   12,256 Mexico   160,029   183,583   190,034   9,117   8,766   8,839 Italy   142,037   45,771   38,164   30,329   27,253   15,170 India   137,837   24,161   12,345   12,519   1,271   1,946 Australia   136,127   82,099   86,809   10,483   8,039   8,424 Brazil   69,378   51,493   84,595   13,184   13,227   9,318 Other international   652,653   381,997   329,375   57,296   60,344   18,472 Total   $ 3,881,756   $ 2,931,188   $ 3,307,998   $ 573,972   $ 518,376   $ 353,193
Sales by Product	Sales by product are as follows: In thousands   2017   2016   2015 Specialty Products & Electronics   $ 1,350,727   $ 1,374,580   $ 1,733,881 Brake Products   749,959   588,081   627,552 Remanufacturing, Overhaul & Build   522,275   559,284   606,624 Transit Products   1,112,340   276,124   189,581 Other   146,455   133,119   150,360 Total sales   $ 3,881,756   $ 2,931,188   $ 3,307,998

X

- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details Name: us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details Name: us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details Name: us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_SegmentReportingAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	Balance Sheet for December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Cash and cash equivalents $ 933   $ 4,802   $ 227,666   $ —   $ 233,401 Receivables, net 77,046   237,360   852,381   —   1,166,787 Inventories 120,937   137,972   483,725   —   742,634 Current assets - other 1,142   4,507   116,642   —   122,291 Total current assets 200,058   384,641   1,680,414   —   2,265,113 Property, plant and equipment 52,532   136,382   385,058   —   573,972 Goodwill 25,274   546,527   1,888,302   —   2,460,103 Investment in subsidiaries 6,517,205   2,570,391   —   (9,087,596 )   — Other intangibles, net 30,575   251,347   922,510   —   1,204,432 Other long term assets 17,414   295   58,651   —   76,360 Total assets $ 6,843,058   $ 3,889,583   $ 4,934,935   $ (9,087,596 )   $ 6,579,980 Current liabilities $ 196,827   217,176   $ 1,159,327   —   $ 1,573,330 Inter-company 2,121,546   (2,026,634 )   (94,912 )   —   — Long-term debt 1,661,771   14   161,518   —   1,823,303 Long-term liabilities - other 54,046   67,824   232,945   —   354,815 Total liabilities 4,034,190   (1,741,620 )   1,458,878   —   3,751,448 Shareholders' equity 2,808,868   5,632,665   3,454,931   (9,087,596 )   2,808,868 Non-controlling interest —   (1,462 )   21,126   —   19,664 Total shareholders' equity $ 2,808,868   $ 5,631,203   $ 3,476,057   $ (9,087,596 )   $ 2,828,532 Total Liabilities and Shareholders' Equity $ 6,843,058   $ 3,889,583   $ 4,934,935   $ (9,087,596 )   $ 6,579,980 Balance Sheet for December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Cash and cash equivalents $ 2,522   $ 9,496   $ 386,466   $ —   $ 398,484 Receivables, net 79,041   202,779   660,688   —   942,508 Inventories 120,042   128,076   410,392   —   658,510 Current assets - other 52,576   (17,844 )   833,397   —   868,129 Total current assets 254,181   322,507   2,290,943   —   2,867,631 Property, plant and equipment 49,031   126,661   342,684   —   518,376 Goodwill 25,275   477,472   1,576,018   —   2,078,765 Investment in subsidiaries 5,388,613   1,325,150   —   (6,713,763 )   — Other intangibles, net 31,897   204,512   817,451   —   1,053,860 Other long term assets 9,592   (1,914 )   54,708   —   62,386 Total assets $ 5,758,589   $ 2,454,388   $ 5,081,804   $ (6,713,763 )   $ 6,581,018 Current liabilities $ 194,983   196,956   $ 1,054,700   —   $ 1,446,639 Inter-company 1,562,399   (1,848,777 )   286,378   —   — Long-term debt 1,761,933   58   976   —   1,762,967 Long-term liabilities - other 33,298   74,977   286,312   —   394,587 Total liabilities 3,552,613   (1,576,786 )   1,628,366   —   3,604,193 Shareholders' equity 2,205,976   4,032,250   2,681,514   (6,713,763 )   2,205,977 Non-controlling interest —   (1,076 )   771,924   —   770,848 Total shareholders' equity $ 2,205,976   $ 4,031,174   $ 3,453,438   $ (6,713,763 )   $ 2,976,825 Total Liabilities and Shareholders' Equity $ 5,758,589   $ 2,454,388   $ 5,081,804   $ (6,713,763 )   $ 6,581,018
Condensed Income Statement	Income Statement for the Year Ended December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 577,397   $ 1,067,954   $ 2,378,817   $ (142,412 )   $ 3,881,756 Cost of sales (440,911 )   (675,546 )   (1,808,370 )   108,384   (2,816,443 ) Gross profit (loss) 136,486   392,408   570,447   (34,028 )   1,065,313 Total operating expenses (113,872 )   (123,423 )   (406,285 )   —   (643,580 ) Income (loss) from operations 22,614   268,985   164,162   (34,028 )   421,733 Interest (expense) income, net (72,233 )   8,843   (5,314 )   —   (68,704 ) Other income (expense), net 5,103   289   (6,358 )   —   (966 ) Equity earnings (loss) 416,068   131,620   —   (547,688 )   — Pretax income (loss) 371,552   409,737   152,490   (581,716 )   352,063 Income tax expense (109,294 )   32,393   (12,872 )   —   (89,773 ) Net income (loss) 262,258   442,130   139,618   (581,716 )   262,290 Less: Net income attributable to noncontrolling interest —   386   (415 )   —   (29 ) Net income (loss) attributable to Wabtec shareholders $ 262,258   $ 442,516   $ 139,203   $ (581,716 )   $ 262,261                     Comprehensive income (loss) attributable to Wabtec shareholders $ 263,907   $ 442,516   $ 472,167   $ (581,716 )   $ 596,874 Income Statement for the Year Ended December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 641,809   $ 1,112,001   $ 1,322,937   $ (145,559 )   $ 2,931,188 Cost of sales (473,700 )   (708,062 )   (928,608 )   103,421   (2,006,949 ) Gross profit (loss) 168,109   403,939   394,329   (42,138 )   924,239 Total operating expenses (141,940 )   (122,617 )   (201,321 )   —   (465,878 ) (Loss) income from operations 26,169   281,322   193,008   (42,138 )   458,361 Interest (expense) income, net (34,975 )   7,012   (14,598 )   —   (42,561 ) Other income (expense), net 20,509   (2,284 )   (21,188 )   —   (2,963 ) Equity earnings (loss) 322,650   131,234   —   (453,884 )   — Pretax income (loss) 334,353   417,284   157,222   (496,022 )   412,837 Income tax expense (29,466 )   (57,667 )   (12,300 )   —   (99,433 ) Net income (loss) 304,887   359,617   144,922   (496,022 )   313,404 Less: Net income attributable to noncontrolling interest —   —   (8,517 )   —   (8,517 ) Net income attributable to Wabtec shareholders $ 304,887   $ 359,617   $ 136,405   $ (496,022 )   $ 304,887                     Comprehensive income (loss) attributable to Wabtec shareholders $ 305,180   $ 359,617   $ 33,226   $ (496,022 )   $ 202,001 Income Statement for the Year Ended December 31, 2015: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net Sales $ 743,262   $ 1,436,935   $ 1,300,577   $ (172,776 )   $ 3,307,998 Cost of sales (531,269 )   (843,104 )   (976,798 )   90,989   (2,260,182 ) Gross (loss) profit 211,993   593,831   323,779   (81,787 )   1,047,816 Total operating expenses (142,953 )   (131,251 )   (166,045 )   —   (440,249 ) (Loss) income from operations 69,040   462,580   157,734   (81,787 )   607,567 Interest (expense) income, net (23,129 )   5,914   327   —   (16,888 ) Other income (expense), net 23,193   (9,140 )   (19,364 )   —   (5,311 ) Equity earnings (loss) 506,903   112,286   —   (619,189 )   — Pretax income (loss) 576,007   571,640   138,697   (700,976 )   585,368 Income tax expense (177,379 )   8,989   (18,350 )   —   (186,740 ) Net income (loss) 398,628   580,629   120,347   (700,976 )   398,628 Less: Net income attributable to noncontrolling interest —   —   —   —   — Net income attributable to Wabtec shareholders $ 398,628   $ 580,629   $ 120,347   $ (700,976 )   $ 398,628                     Comprehensive income (loss) attributable to Wabtec shareholders $ 409,734   $ 580,629   $ (7,992 )   $ (700,976 )   $ 281,395
Condensed Cash Flow Statement	Condensed Statement of Cash Flows for the year ended December 31, 2017: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash (used in) provided by operating activities $ (49,231 )   $ 249,204   $ 22,866   $ (34,028 )   $ 188,811 Net cash used in investing activities (11,156 )   (120,661 )   (143,912 )   —   (275,729 ) Net cash provided by (used in) financing activities 58,798   (133,237 )   (57,020 )   34,028   (97,431 ) Effect of changes in currency exchange rates —   —   19,266   —   19,266 Increase (decrease) in cash (1,589 )   (4,694 )   (158,800 )   —   (165,083 ) Cash, beginning of year 2,522   9,496   386,466   —   398,484 Cash, end of year $ 933   $ 4,802   $ 227,666   $ —   $ 233,401 Condensed Statement of Cash Flows for the year ended December 31, 2016: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash provided by (used in) operating activities $ (44,611 )   $ 332,822   $ 204,457   $ (42,138 )   $ 450,530 Net cash used in investing activities (829,783 )   (14,725 )   69,443   —   (775,065 ) Net cash (used in) provided by financing activities 876,916   (321,758 )   (74,325 )   42,138   522,971 Effect of changes in currency exchange rates —   —   (26,143 )   —   (26,143 ) (Decrease) increase in cash 2,522   (3,661 )   173,432   —   172,293 Cash, beginning of year —   13,157   213,034   —   226,191 Cash, end of year $ 2,522   $ 9,496   $ 386,466   $ —   $ 398,484 Condensed Statement of Cash Flows for the year ended December 31, 2015: In thousands Parent   Guarantors   Non-Guarantors   Elimination   Consolidated Net cash provided by (used in) operating activities $ (90,374 )   $ 487,516   $ 135,489   $ (81,787 )   $ 450,844 Net cash used in investing activities (7,862 )   (109,326 )   (262,948 )   —   (380,136 ) Net cash provided by (used in) financing activities (48,570 )   (378,330 )   93,615   81,787   (251,498 ) Effect of changes in currency exchange rates —   —   (18,868 )   —   (18,868 ) Increase in cash (146,806 )   (140 )   (52,712 )   —   (199,658 ) Cash, beginning of year 146,806   13,297   265,746   —   425,849 Cash, end of year $ —   $ 13,157   $ 213,034   $ —   $ 226,191

X

- References No definition available. + Details Name: us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References No definition available. + Details Name: us-gaap_ScheduleOfCondensedBalanceSheetTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations. + References No definition available. + Details Name: us-gaap_ScheduleOfCondensedCashFlowStatementTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of condensed income statement, including, but not limited to, income statements of consolidated entities and consolidation eliminations. + References No definition available. + Details Name: us-gaap_ScheduleOfCondensedIncomeStatementTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

OTHER (EXPENSE) INCOME, NET (Tables)	12 Months Ended
	Dec. 31, 2017
Other Income and Expenses [Abstract]
Components of Other (Expense) Income	The components of other (expense) income, net are as follows:     For the year ended December 31, In thousands   2017   2016   2015 Foreign currency loss   $ (6,618 )   $ (4,001 )   $ (4,659 ) Equity income   2,579   409   — Other miscellaneous income (expense)   3,073   629   (652 ) Total other (expense) income, net   $ (966 )   $ (2,963 )   $ (5,311 )

X

- References No definition available. + Details Name: us-gaap_OtherIncomeAndExpensesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details Name: us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data	First   Second   Third   Fourth In thousands, except per share data   Quarter   Quarter   Quarter   Quarter (1) 2017                 Net sales   $ 916,034   $ 932,253   $ 957,931   $ 1,075,538 Gross profit   269,707   273,963   253,203   268,440 Income from operations   114,858   113,701   102,011   91,163 Net income attributable to Wabtec shareholders   73,889   72,025   67,399   48,948 Basic earnings from operations per common share   $ 0.77   $ 0.75   $ 0.70   $ 0.51 Diluted earnings from operations per common share   $ 0.77   $ 0.75   $ 0.70   $ 0.51 2016                 Net sales   $ 772,031   $ 723,601   $ 675,574   $ 759,982 Gross profit   255,180   237,389   212,481   219,189 Income from operations   142,181   133,284   120,096   62,800 Net income attributable to Wabtec shareholders   94,163   90,485   82,428   46,328 Basic earnings from operations per common share   $ 1.03   $ 1.00   $ 0.92   $ 0.42 Diluted earnings from operations per common share   $ 1.02   $ 1.00   $ 0.91   $ 0.42

X

- References No definition available. + Details Name: us-gaap_QuarterlyFinancialInformationDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details Name: us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.8.0.1

BUSINESS - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 country
Product Information [Line Items]
Number of countries where product found (more than)	100
Number of countries company operates	31
Sales Revenue, Net | Geographic Concentration Risk | Non-US
Product Information [Line Items]
Revenues from customers outside the U.S. (as a percent)	66.00%

X

- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details Name: us-gaap_ConcentrationRiskPercentage1 Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details Name: us-gaap_NumberOfCountriesInWhichEntityOperates Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ProductInformationLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of countries where product found. + References No definition available. + Details Name: wab_NumberOfCountriesWhereProductFound Namespace Prefix: wab_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=us-gaap_NonUsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 05, 2014	Jan. 12, 2012
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	$ 12,300,000	$ 7,300,000
Product warranty expense	50,400,000	28,900,000	$ 35,400,000
Accrued product warranty	153,063,000	138,992,000	92,064,000
Interest rate swap, accumulated other comprehensive loss	(4,015,000)	2,957,000
Foreign exchange transaction losses recognized in other (expense) income, net	6,618,000	4,001,000	4,659,000
Net income attributable to noncontrolling interest	29,000	8,517,000	0
Unbilled accounts receivable	366,168,000	274,912,000
Customer deposits	369,716,000	256,591,000
Provisions for loss contracts	94,000,000	60,500,000
Deferred pre-production costs	20,200,000	29,400,000
Research and development costs	95,166,000	71,375,000	$ 71,213,000
Interest rate swap agreements
Summary Of Significant Accounting Policies [Line Items]
Interest rate swap agreements, notional amount	150,000,000			$ 150,000,000.0	$ 150,000,000.0
Interest rate swap agreement, current liability	$ 1,163,000	$ 3,888,000

X

- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CustomerDepositsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Deferred incremental direct costs incurred typically at a contract's inception so that the company may be in a position to fulfill all contractual obligations of an arrangement. The costs are directly related to specified activities under the arrangement and are deferred in order to match revenue that will be recognized after one year from the balance sheet date (or one operating cycle if longer). Excludes start-up costs (such as one-time activities related to opening a new facility, introducing a new product or service, establishing business with a new class of customers, preopening costs, and organization costs), which are expensed as incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(f).Q3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3(f).Q4) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details Name: us-gaap_DeferredSetUpCostsNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details Name: us-gaap_DerivativeLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeLiabilityNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

X

- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details Name: us-gaap_ForeignCurrencyTransactionGainLossRealized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_NetIncomeLossAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_ProductWarrantyAccrual Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_ProductWarrantyExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details Name: us-gaap_ProvisionForDoubtfulAccounts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57777-111642 + Details Name: us-gaap_ProvisionForLossOnContracts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details Name: us-gaap_ResearchAndDevelopmentExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details Name: us-gaap_UnbilledReceivablesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Summary of significant accounting policies. + References No definition available. + Details Name: wab_SummaryOfSignificantAccountingPoliciesLineItems Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

ACQUISITIONS - Narrative (Detail) $ in Thousands					3 Months Ended	12 Months Ended
	Mar. 21, 2017 USD ($)	Mar. 06, 2017 USD ($)	Feb. 03, 2017 USD ($)	Nov. 30, 2016 USD ($) employee country	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 04, 2017 USD ($)	Oct. 02, 2017 USD ($)	Apr. 05, 2017 USD ($)	Mar. 14, 2017 USD ($)	Mar. 13, 2017 USD ($)	Dec. 14, 2016 USD ($)	Nov. 30, 2016 € / shares	Nov. 17, 2016 USD ($)	Aug. 01, 2016 USD ($)	May 05, 2016 USD ($)
Business Acquisition [Line Items]
Cash payment for acquisition						$ 982,445	$ 904,695	$ 135,231
Stock used for acquisition						25,500	534,679	0
Cash acquired from acquisition						35,408	186,903	$ 5,681
Deposit in escrow						0	744,748
Acquisition of Faiveley Transport noncontrolling interest							760,599
Goodwill						2,460,103	2,078,765
Freight Segment
Business Acquisition [Line Items]
Goodwill						718,958	550,902
Transit Segment
Business Acquisition [Line Items]
Goodwill						1,741,145	1,527,863
Faiveley
Business Acquisition [Line Items]
Annual sales of Faiveley				$ 1,200,000
Number of employees (more than) | employee				5,700
Number of countries Faiveley operates in | country				24
Purchase price per share (in euros per share) | € / shares															€ 100
Percentage of share capital acquired (as a percent)				51.00%
Percentage of voting interests in Faiveley (as a percent)		22.00%	27.00%	49.00%
Number of common shares issued for conversion of one acquiree common share				1.1538
Percentage of additional share capital outstanding (as a percent)		21.00%	27.00%
Cash payment for acquisition	$ 17,500	$ 303,200	$ 411,800
Stock used for acquisition		$ 300	$ 25,200
Percentage of share capital owned (as a percent)	100.00%	99.00%	78.00%
Total purchase price (as a percent)	100.00%	98.00%	76.00%	100.00%
Business combination, consideration transferred				$ 1,507,000
Deposit in escrow							$ 744,700
Acquisition of Faiveley Transport noncontrolling interest					$ 8,900
Adjustment for change in value of current liabilities						65,300
Adjustment for changes in receivables				439,631
Adjustment for changes in liabilities				819,493
Adjustment to other noncurrent assets						30,000
Goodwill adjustment						74,100
Accrued compensation assumed within other liabilities				25,900
Goodwill				1,262,350
Faiveley | Fair Value of Receivables | Restatement Adjustment
Business Acquisition [Line Items]
Adjustment for changes in receivables						2,800
Faiveley | Fair Value of Current Liabilities | Restatement Adjustment
Business Acquisition [Line Items]
Adjustment for changes in liabilities						36,200
Faiveley | Fair Value of Assets Acquired and Liabilities Assumed | Restatement Adjustment
Business Acquisition [Line Items]
Adjustment for changes in receivables						64,300
Adjustment for changes in liabilities						64,300
Faiveley | Customer Relationships
Business Acquisition [Line Items]
Adjustment for change in value of customer relationships						21,800
Faiveley | Freight Segment
Business Acquisition [Line Items]
Goodwill				72,000
Faiveley | Transit Segment
Business Acquisition [Line Items]
Goodwill				$ 1,190,400
Faiveley | Minimum
Business Acquisition [Line Items]
Percentage of business acquisition consideration payable in cash (as a percent)				25.00%
Faiveley | Maximum
Business Acquisition [Line Items]
Percentage of business acquisition consideration payable in cash (as a percent)				45.00%
Melett
Business Acquisition [Line Items]
Goodwill									$ 22,501
Purchase price									73,956
Goodwill expected to be deductible for taxes									0
Acquired intangible assets									$ 39,259
TTC
Business Acquisition [Line Items]
Goodwill											$ 16,309
Purchase price											32,511
Goodwill expected to be deductible for taxes											16,300
Acquired intangible assets											$ 12,300
ATP
Business Acquisition [Line Items]
Goodwill													$ 29,034
Purchase price													65,254
Goodwill expected to be deductible for taxes												$ 31,900
Acquired intangible assets													$ 25,000
Workhorse
Business Acquisition [Line Items]
Goodwill														$ 22,273
Purchase price														43,827
Goodwill expected to be deductible for taxes														$ 9,200
Goodwill deductible for taxes (as a percent)														38.00%
Acquired intangible assets														$ 21,500
Precision Turbo
Business Acquisition [Line Items]
Goodwill																$ 4,248
Purchase price																13,853
Goodwill expected to be deductible for taxes																4,200
Acquired intangible assets																$ 5,200
Unitrac
Business Acquisition [Line Items]
Goodwill																		$ 2,442
Purchase price																		14,771
Goodwill expected to be deductible for taxes																		2,400
Acquired intangible assets																		$ 1,230
AM General
Business Acquisition [Line Items]
Goodwill										$ 12,943
Purchase price										10,416
Goodwill expected to be deductible for taxes										0
Acquired intangible assets										$ 12,097
Gerken
Business Acquisition [Line Items]
Goodwill																	$ 17,470
Purchase price																	62,847
Goodwill expected to be deductible for taxes																	0
Acquired intangible assets																	$ 30,560
Acquisitions other than Faiveley
Business Acquisition [Line Items]
Deposit in escrow						44,400
Recent Acquisitions
Business Acquisition [Line Items]
Goodwill						1,389,600
Goodwill and other intangible assets						2,117,800
Acquired intangible assets						728,200
Recent Acquisitions | Trade Names
Business Acquisition [Line Items]
Acquired intangible assets						380,900
Recent Acquisitions | Intellectual Property
Business Acquisition [Line Items]
Acquired intangible assets						$ 5,000
Average useful life, years						20 years
Recent Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets						$ 336,900
Average useful life, years						20 years

X

- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details Name: us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_BusinessAcquisitionLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details Name: us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details Name: us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + Details Name: us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details Name: us-gaap_BusinessAcquisitionSharePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details Name: us-gaap_BusinessCombinationConsiderationTransferred1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details Name: us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial assets acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details Name: us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details Name: us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details Name: us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details Name: us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details Name: us-gaap_CashAcquiredFromAcquisition Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_EscrowDeposit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details Name: us-gaap_GoodwillPurchaseAccountingAdjustments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase in noncontrolling interest from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquireBusinessesGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Business Acquisition, Additional Share Capital Acquired, Percent + References No definition available. + Details Name: wab_BusinessAcquisitionAdditionalShareCapitalAcquiredPercent Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Business Acquisition Conversion Ratio, Acquiree Shares to Acquiror + References No definition available. + Details Name: wab_BusinessAcquisitionConversionRatioAcquireeSharestoAcquiror Namespace Prefix: wab_ Data Type: xbrli:pureItemType Balance Type: na Period Type: instant

X

- Definition Business Acquisition, Percentage of Share Capital Acquired + References No definition available. + Details Name: wab_BusinessAcquisitionPercentageofShareCapitalAcquired Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Business Acquisition, Purchase Price Allocation, Goodwill Expected Tax Deductible Percent + References No definition available. + Details Name: wab_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductiblePercent Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Business combination number of countries. + References No definition available. + Details Name: wab_BusinessCombinationNumberOfCountries Namespace Prefix: wab_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Business combination number of employees. + References No definition available. + Details Name: wab_BusinessCombinationNumberOfEmployees Namespace Prefix: wab_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Compensation + References No definition available. + Details Name: wab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedCompensation Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill and Other Intangible Assets + References No definition available. + Details Name: wab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGoodwillandOtherIntangibleAssets Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Business Combination, Step Acquisition, Share Capital in Acquiree, Including Subsequent Acquisition, Percentage + References No definition available. + Details Name: wab_BusinessCombinationStepAcquisitionShareCapitalinAcquireeIncludingSubsequentAcquisitionPercentage Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Percentage of business acquisition consideration payable in cash. + References No definition available. + Details Name: wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_FreightSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_TransitSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_FaiveleyTransportMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=wab_FairValueofReceivablesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementScenarioAxis=us-gaap_RestatementAdjustmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=wab_FairValueofCurrentLiabilitiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=wab_FairValueofAssetsAcquiredandLiabilitiesAssumedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_MelettLimitedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_ThermalTransferCorporationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_AeroTransportationProductsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_WorkhorseMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_PrecisionTurboMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_UnitracMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_AMGeneralContractorMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_GerkenMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_AcquisitionsotherthanFaiveleyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_RecentAcquisitionsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_IntellectualPropertyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

ACQUISITIONS - Summary of Preliminary Estimated Fair Values of Faiveley Transport Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2016
Assets acquired
Goodwill	$ 2,460,103	$ 2,078,765
Faiveley
Assets acquired
Cash and cash equivalents			$ 178,318
Accounts receivable			439,631
Inventories			205,649
Other current assets			70,930
Property, plant & equipment			148,746
Goodwill			1,262,350
Other noncurrent assets			184,564
Total assets acquired			3,071,246
Liabilities assumed
Current liabilities			819,493
Debt			409,899
Other noncurrent liabilities			335,039
Total liabilities assumed			1,564,431
Net assets acquired			1,506,815
Faiveley | Trade Names
Assets acquired
Acquired intangible assets			346,328
Faiveley | Customer Relationships
Assets acquired
Acquired intangible assets			233,529
Faiveley | Patents
Assets acquired
Acquired intangible assets			$ 1,201

X

- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_FaiveleyTransportMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

ACQUISITIONS - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 04, 2017	Oct. 02, 2017	Apr. 05, 2017	Mar. 13, 2017	Dec. 31, 2016	Dec. 14, 2016	Nov. 17, 2016	Aug. 01, 2016	May 05, 2016
Business Acquisition [Line Items]
Goodwill	$ 2,460,103					$ 2,078,765
Melett
Business Acquisition [Line Items]
Current assets		$ 21,068
Property, plant & equipment		5,917
Goodwill		22,501
Other intangible assets		39,259
Total assets acquired		88,745
Total liabilities assumed		(14,789)
Net assets acquired		$ 73,956
TTC
Business Acquisition [Line Items]
Current assets				$ 3,746
Property, plant & equipment				5,909
Goodwill				16,309
Other intangible assets				12,300
Total assets acquired				38,264
Total liabilities assumed				(5,753)
Net assets acquired				$ 32,511
ATP
Business Acquisition [Line Items]
Current assets					$ 11,666
Property, plant & equipment					5,354
Goodwill					29,034
Other intangible assets					25,000
Total assets acquired					71,054
Total liabilities assumed					(5,800)
Net assets acquired					$ 65,254
Workhorse
Business Acquisition [Line Items]
Current assets							$ 9,137
Property, plant & equipment							0
Goodwill							22,273
Other intangible assets							21,500
Total assets acquired							52,910
Total liabilities assumed							(9,083)
Net assets acquired							$ 43,827
Precision Turbo
Business Acquisition [Line Items]
Current assets								$ 4,145
Property, plant & equipment								1,317
Goodwill								4,248
Other intangible assets								5,200
Total assets acquired								14,910
Total liabilities assumed								(1,057)
Net assets acquired								$ 13,853
Unitrac
Business Acquisition [Line Items]
Current assets										$ 11,476
Property, plant & equipment										1,768
Goodwill										2,442
Other intangible assets										1,230
Total assets acquired										16,916
Total liabilities assumed										(2,145)
Net assets acquired										$ 14,771
AM General
Business Acquisition [Line Items]
Current assets			$ 6,611
Property, plant & equipment			4,140
Goodwill			12,943
Other intangible assets			12,097
Other assets			0
Total assets acquired			35,791
Total liabilities assumed			(25,375)
Net assets acquired			$ 10,416
Gerken
Business Acquisition [Line Items]
Current assets									$ 32,706
Property, plant & equipment									7,667
Goodwill									17,470
Other intangible assets									30,560
Other assets									1,706
Total assets acquired									90,109
Total liabilities assumed									(27,262)
Net assets acquired									$ 62,847

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_BusinessAcquisitionLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_MelettLimitedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_ThermalTransferCorporationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_AeroTransportationProductsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_WorkhorseMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_PrecisionTurboMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_UnitracMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_AMGeneralContractorMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_GerkenMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Net sales									$ 3,946,244	$ 4,212,617
Gross profit									1,095,101	1,275,835
Net income attributable to Wabtec shareholders									$ 271,783	$ 349,852
Diluted earnings per share
As Reported (in dollars per share)	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 0.42	$ 0.91	$ 1.00	$ 1.02	$ 2.72	$ 3.34	$ 4.10
Pro forma (in dollars per share)									$ 2.82	$ 3.83

X

- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details Name: us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details Name: us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details Name: us-gaap_BusinessAcquisitionsProFormaRevenue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_BusinessCombinationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareDiluted Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareDilutedAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The proforma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details Name: wab_BusinessAcquisitionProFormaGrossProfit Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.8.0.1

SUPPLEMENTAL CASH FLOW DISCLOSURES - Schedule of Cash Flow Disclosures (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Interest paid during the year	$ 75,317	$ 30,211	$ 19,372
Income taxes paid during the year, net of amount refunded	89,379	121,563	147,958
Fair value of assets acquired	452,209	3,118,420	156,020
Liabilities assumed	207,788	1,453,382	20,789
Non-controlling interest (acquired) assumed	(738,024)	760,343	0
Stock and cash paid	982,445	904,695	135,231
Less: Cash acquired	35,408	186,903	5,681
Stock used for acquisition	25,500	534,679	0
Net cash paid	$ 921,537	$ 183,113	$ 129,550

X

- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details Name: us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details Name: us-gaap_CashAcquiredFromAcquisition Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The fair value of assets acquired in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details Name: us-gaap_FairValueOfAssetsAcquired Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details Name: us-gaap_IncomeTaxesPaidNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details Name: us-gaap_InterestPaid Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The fair value of liabilities assumed in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details Name: us-gaap_LiabilitiesAssumed1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquireBusinessesGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_SupplementalCashFlowElementsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Noncontrolling Interest Assumed + References No definition available. + Details Name: wab_NoncontrollingInterestAssumed Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.8.0.1

INVENTORIES - Components of Inventory, Net of Reserves (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 378,481	$ 331,465
Work-in-progress	167,390	145,462
Finished goods	196,763	181,583
Total inventories	$ 742,634	$ 658,510

X

- References No definition available. + Details Name: us-gaap_InventoryDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details Name: us-gaap_InventoryFinishedGoodsNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details Name: us-gaap_InventoryNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details Name: us-gaap_InventoryRawMaterialsNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details Name: us-gaap_InventoryWorkInProcessNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.8.0.1

PROPERTY, PLANT & EQUIPMENT - Major Classes of Depreciable Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Machinery and equipment	$ 728,257	$ 645,354
Buildings and improvements	259,561	225,307
Land and improvements	38,228	41,569
Property, plant and equipment	1,026,046	912,230
Accumulated depreciation	(452,074)	(393,854)
Property, plant and equipment, net	$ 573,972	$ 518,376	$ 353,193

X

- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_BuildingsAndImprovementsGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LandAndLandImprovements Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_MachineryAndEquipmentGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PropertyPlantAndEquipmentGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_PropertyPlantAndEquipmentNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.8.0.1

PROPERTY, PLANT & EQUIPMENT - Estimated Useful Lives of Property Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Land improvements | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	10 years
Land improvements | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	20 years
Building and improvements | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	20 years
Building and improvements | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	40 years
Machinery and equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	3 years
Machinery and equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated useful lives in years	15 years

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentUsefulLife Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandImprovementsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

PROPERTY, PLANT & EQUIPMENT - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 66.7	$ 47.1	$ 43.1

X

- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_Depreciation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_PropertyPlantAndEquipmentAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

INTANGIBLES - Change in the Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance beginning of period	$ 2,078,765
Additions	186,487
Foreign currency impact	194,851
Balance end of period	2,460,103
Freight Segment
Goodwill [Roll Forward]
Balance beginning of period	550,902
Additions	152,096
Foreign currency impact	15,960
Balance end of period	718,958
Transit Segment
Goodwill [Roll Forward]
Balance beginning of period	1,527,863
Additions	34,391
Foreign currency impact	178,891
Balance end of period	$ 1,741,145

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details Name: us-gaap_GoodwillAcquiredDuringPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details Name: us-gaap_GoodwillForeignCurrencyTranslationGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_GoodwillRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_FreightSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_TransitSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

INTANGIBLES - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible Assets Disclosure [Line Items]
Trade names	$ 603,400	$ 510,500
Intangible assets, amortization expense	$ 36,516	$ 22,698	$ 21,663
Patents
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	10 years
Customer Relationships
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	17 years
Intellectual Property
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	15 years

X

- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_AmortizationOfIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_IndefiniteLivedTradeNames Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Intangible assets disclosure. + References No definition available. + Details Name: wab_IntangibleAssetsDisclosureLineItems Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_IntellectualPropertyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	$ 601,013	$ 543,428
Patents And Other
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	17,554	15,360
Intangible assets, accumulated amortization	43,021	40,638
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	583,459	528,068
Intangible assets, accumulated amortization	$ 126,824	$ 87,334

X

- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=wab_PatentsAndOtherMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

INTANGIBLES - Estimated Amortization Expense Five Succeeding Years (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018	$ 38,059
2019	36,076
2020	34,050
2021	33,777
2022	$ 33,489

X

- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2016	Aug. 31, 2013
Debt Instrument [Line Items]
Capital Leases	$ 2,324	$ 1,018
Total	1,870,528	1,892,776
Less - current portion	47,225	129,809
Long-term portion	1,823,303	1,762,967
Other Debt Obligations
Debt Instrument [Line Items]
Long-term debt	6,860	1,153
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt	853,124	796,150
Unamortized debt issuance cost	2,451	3,850
Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term debt	$ 747,655	747,474
Stated interest rate (as a percent)	3.45%
Senior Notes Due 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 747,655	747,474
Stated interest rate (as a percent)	3.45%		3.45%
Unamortized debt issuance cost	$ 2,345	2,526
4.375% Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 248,567	248,310
Stated interest rate (as a percent)	4.375%
4.375% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 248,567	248,310
Stated interest rate (as a percent)	4.375%			4.375%
Unamortized debt issuance cost	$ 1,433	1,690
Schuldschein Loan
Debt Instrument [Line Items]
Long-term debt	$ 11,998	$ 98,671

X

- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details Name: us-gaap_CapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details Name: us-gaap_DebtAndCapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_DebtInstrumentInterestRateStatedPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DebtInstrumentLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details Name: us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_OtherDebtSecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_SeniorNotesDue2026Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_FourPointThreeSevenFivePercentSeniorNotesDueTwoThousandTwentyThreeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_SchuldscheinLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

LONG-TERM DEBT - Narrative (Detail)			1 Months Ended	12 Months Ended
	Oct. 31, 2016 USD ($)	Jun. 22, 2016 USD ($)	Aug. 31, 2013 USD ($)	Dec. 31, 2017 USD ($) investor	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Jun. 05, 2014 USD ($)	Jan. 12, 2012 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)				2.92%
Faiveley
Debt Instrument [Line Items]
Liabilities assumed						$ 1,564,431,000
Interest rate swap agreements
Debt Instrument [Line Items]
Interest rate swap agreements, notional amount				$ 150,000,000			$ 150,000,000.0	$ 150,000,000.0
Interest rate on notional value (as a percent)							2.56%	1.415%
Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (as a percent)				3.45%
Long-term debt				$ 747,655,000	$ 747,474,000
4.375% Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)				4.375%
Long-term debt				$ 248,567,000	248,310,000
Two Thousand Sixteen Refinancing Credit Agreement
Debt Instrument [Line Items]
Deferred financing cost		$ 3,300,000
Minimum interest expense coverage ratio				3.0
Maximum debt to cash flow ratio				3.25
Two Thousand Sixteen Refinancing Credit Agreement | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				0.50%
Two Thousand Sixteen Refinancing Credit Agreement | LIBOR
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				1.00%
Two Thousand Sixteen Refinancing Credit Agreement | Base Rate
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				0.00%
Two Thousand Sixteen Refinancing Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				0.00%
Two Thousand Sixteen Refinancing Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				0.75%
Two Thousand Sixteen Refinancing Credit Agreement | Alternative Rate
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				1.75%
Two Thousand Sixteen Refinancing Credit Agreement | Alternative Rate | Minimum
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				0.75%
Two Thousand Sixteen Refinancing Credit Agreement | Alternative Rate | Maximum
Debt Instrument [Line Items]
Debt instrument basis points spread on variable rate				1.75%
Two Thousand Sixteen Refinancing Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Long-term line of credit				$ 35,400,000
Schuldschein Loan
Debt Instrument [Line Items]
Long-term debt				$ 11,998,000	98,671,000
Schuldschein Loan | Faiveley
Debt Instrument [Line Items]
Stated interest rate (as a percent)				4.00%
Liabilities assumed				$ 137,200,000
Number of investors | investor				20
Repayments of debt				$ 125,300,000
Long-term debt				$ 12,000,000
Senior Notes | Senior Notes Due 2026
Debt Instrument [Line Items]
Debt instrument face amount	$ 750,000,000.0
Debt issuance face value (as a percent)	99.965%
Stated interest rate (as a percent)	3.45%			3.45%
Deferred financing cost	$ 2,700,000
Long-term debt				$ 747,655,000	747,474,000
Senior Notes | 4.375% Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount			$ 250,000,000.0
Debt issuance face value (as a percent)			99.879%
Stated interest rate (as a percent)			4.375%	4.375%
Deferred financing cost			$ 2,600,000
Long-term debt				$ 248,567,000	248,310,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt				853,124,000	$ 796,150,000
Line of Credit | Two Thousand Sixteen Refinancing Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, amount		$ 1,200,000,000.0
Credit facility loan term, years		5 years
Line of credit facility, amount currently available				$ 679,000,000
Line of Credit | Two Thousand Sixteen Refinancing Credit Agreement | Term Loan
Debt Instrument [Line Items]
Revolving credit facility, amount		$ 400,000,000
Commitment fee (as a percent)		0.10%

X

- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details Name: us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details Name: us-gaap_DebtInstrumentFaceAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_DebtInstrumentInterestRateStatedPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DebtInstrumentLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details Name: us-gaap_DebtInstrumentRedemptionPricePercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details Name: us-gaap_DeferredFinanceCostsGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details Name: us-gaap_DerivativeFixedInterestRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeLiabilityNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

X

- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_LineOfCredit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details Name: us-gaap_LineOfCreditFacilityCommitmentFeePercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details Name: us-gaap_LineOfCreditFacilityExpirationPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtPercentageBearingVariableInterestRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details Name: us-gaap_RepaymentsOfDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Maximum Debt To Cash Flow Ratio + References No definition available. + Details Name: wab_MaximumDebtToCashFlowRatio Namespace Prefix: wab_ Data Type: xbrli:pureItemType Balance Type: na Period Type: duration

X

- Definition Minimum Interest Expense Coverage Ratio + References No definition available. + Details Name: wab_MinimumInterestExpenseCoverageRatio Namespace Prefix: wab_ Data Type: xbrli:pureItemType Balance Type: na Period Type: duration

X

- Definition Number of Investors + References No definition available. + Details Name: wab_NumberofInvestors Namespace Prefix: wab_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

X

- Details Name: us-gaap_BusinessAcquisitionAxis=wab_FaiveleyTransportMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_SeniorNotesDue2026Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_FourPointThreeSevenFivePercentSeniorNotesDueTwoThousandTwentyThreeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_TwoThousandSixteenRefinancingCreditAgreementMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_VariableRateAxis=us-gaap_BaseRateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_VariableRateAxis=wab_AlternativeRateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_SchuldscheinLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditFacilityAxis=wab_TermLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

LONG-TERM DEBT - Principal Repayments of Debt and Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
2018	$ 47,225
2019	330,901
2020	559
2021	483,379
2022	208
Future years	1,008,256
Total	$ 1,870,528	$ 1,892,776

X

- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details Name: us-gaap_DebtAndCapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_DebtDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Obligations and Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in the statement of financial position consist of:
Noncurrent liabilities				$ (103,734)	$ (110,597)
United States | Defined Benefit Pension Plans
Change in projected benefit obligation
Obligation at beginning of year	$ (45,512)	$ (46,120)
Opening balance sheet adjustment	0	0
Service cost	(344)	(337)	$ (381)
Interest cost	(1,422)	(1,475)	(1,914)
Employee contributions	0	0
Plan curtailments and amendments	0	0
Benefits paid	3,079	3,893
Acquisition	0	0
Actuarial gain (loss)	(14)	(1,473)
Effect of currency rate changes	0	0
Obligation at end of year	(44,213)	(45,512)	(46,120)
Change in plan assets
Fair value of plan assets at beginning of year	35,802	37,640
Opening balance sheet adjustment	0	0
Actual return on plan assets	4,223	2,055
Employer contributions	486	0
Employee contributions	0	0
Benefits paid	(3,079)	(3,893)
Acquisition	0	0
Effect of currency rate changes	0	0
Fair value of plan assets at end of year	37,432	35,802	37,640
Benefit obligations	(45,512)	(46,120)	(46,120)	(44,213)	(45,512)
Funded status				(6,781)	(9,710)
Amounts recognized in the statement of financial position consist of:
Noncurrent assets				0	0
Current liabilities				0	0
Noncurrent liabilities				(6,781)	(9,710)
Net amount recognized				(6,781)	(9,710)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Prior service cost				(6)	(8)
Net actuarial (loss) gain				(20,418)	(23,884)
Net amount recognized				(20,424)	(23,892)
United States | Other Postretirement Benefits Plans
Change in projected benefit obligation
Obligation at beginning of year	(11,876)	(12,959)
Service cost	(5)	(4)	(9)
Interest cost	(350)	(389)	(1,233)
Plan amendments	0	6
Benefits paid	970	720
Acquisition	0	(143)
Actuarial gain (loss)	(84)	893
Effect of currency rate changes	0	0
Obligation at end of year	(11,345)	(11,876)	(12,959)
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Employer contributions	970	720
Benefits paid	(970)	(720)
Fair value of plan assets at end of year	0	0	0
Benefit obligations	(11,876)	(12,959)	(12,959)	(11,345)	(11,876)
Funded status				(11,345)	(11,876)
Amounts recognized in the statement of financial position consist of:
Current liabilities				(1,046)	(1,084)
Noncurrent liabilities				(10,299)	(10,792)
Net amount recognized				(11,345)	(11,876)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Prior service cost				19,616	21,134
Net actuarial (loss) gain				(18,882)	(20,023)
Net amount recognized				734	1,111
Foreign Plan | Defined Benefit Pension Plans
Change in projected benefit obligation
Obligation at beginning of year	(319,551)	(195,311)
Opening balance sheet adjustment	(5,321)	0
Service cost	(2,740)	(1,379)	(2,015)
Interest cost	(7,310)	(5,774)	(7,091)
Employee contributions	(880)	(195)
Plan curtailments and amendments	4,153	2,061
Benefits paid	12,906	9,427
Acquisition	0	(114,242)
Actuarial gain (loss)	(3,009)	(33,330)
Effect of currency rate changes	(31,265)	19,192
Obligation at end of year	(353,017)	(319,551)	(195,311)
Change in plan assets
Fair value of plan assets at beginning of year	241,283	168,069
Opening balance sheet adjustment	2,058	0
Actual return on plan assets	19,102	20,066
Employer contributions	13,479	6,933
Employee contributions	880	195
Benefits paid	(12,905)	(9,427)
Acquisition	0	70,519
Settlements	(4,523)
Effect of currency rate changes	22,228	(15,072)
Fair value of plan assets at end of year	281,602	241,283	168,069
Benefit obligations	(319,551)	(195,311)	(195,311)	(353,017)	(319,551)
Funded status				(71,415)	(78,268)
Amounts recognized in the statement of financial position consist of:
Noncurrent assets				10,577	7,130
Current liabilities				(2,158)	(2,042)
Noncurrent liabilities				(79,834)	(83,356)
Net amount recognized				(71,415)	(78,268)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Prior service cost				(32)	(56)
Net actuarial (loss) gain				(54,043)	(56,411)
Net amount recognized				(54,075)	(56,467)
Foreign Plan | Other Postretirement Benefits Plans
Change in projected benefit obligation
Obligation at beginning of year	(3,425)	(3,290)
Service cost	(28)	(29)	(38)
Interest cost	(98)	(99)	(128)
Plan amendments	0	0
Benefits paid	199	133
Acquisition	0	0
Actuarial gain (loss)	(131)	(42)
Effect of currency rate changes	(237)	(98)
Obligation at end of year	(3,720)	(3,425)	(3,290)
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Employer contributions	199	133
Benefits paid	(199)	(133)
Fair value of plan assets at end of year	0	0	0
Benefit obligations	$ (3,425)	$ (3,290)	$ (3,290)	(3,720)	(3,425)
Funded status				(3,720)	(3,425)
Amounts recognized in the statement of financial position consist of:
Current liabilities				(208)	(185)
Noncurrent liabilities				(3,512)	(3,160)
Net amount recognized				(3,720)	(3,345)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Prior service cost				9	15
Net actuarial (loss) gain				154	292
Net amount recognized				$ 163	$ 307

X

- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanActuarialGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in plan assets of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanContributionsByEmployer Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details Name: us-gaap_DefinedBenefitPlanFundedStatusOfPlan Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanInterestCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPlanAmendments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanServiceCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanSettlementsPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details Name: us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Defined Benefit Plan, Benefit Obligation, Balance Sheet Adjustment + References No definition available. + Details Name: wab_DefinedBenefitPlanBenefitObligationBalanceSheetAdjustment Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Defined benefit plan curtailments and amendments. + References No definition available. + Details Name: wab_DefinedBenefitPlanCurtailmentsAndAmendments Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Defined Benefit Plan, Plan Assets, Balance Sheet Adjustment + References No definition available. + Details Name: wab_DefinedBenefitPlanPlanAssetsBalanceSheetAdjustment Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of shares held on behalf of participants (in shares)	495,274	551,482
Market value of the shares held on behalf of participants	$ 40.3	$ 45.8
United States | Defined Benefit Pension Plans
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Aggregate accumulated benefit obligation	43.3	44.5
Contribution to the plan	$ 0.0
United States | Defined Benefit Pension Plans | Equity security funds
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Target asset allocation (as a percent)	55.00%
United States | Defined Benefit Pension Plans | Debt security funds and other
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Target asset allocation (as a percent)	45.00%
United States | Other Postretirement Benefits Plans
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Assumed health care cost trend rate, initial rate (as a percent)	6.30%
Assumed health care cost trend rate, ultimate rate (as a percent)	4.50%
Effect of 1% point increase on service and interest cost components (less than)	$ 0.1
Effect of 1% point increase on accumulated postretirement benefit obligation	0.1
Effect of 1% point decrease on service and interest cost components (less than)	0.1
Effect of 1% point decrease on accumulated postretirement benefit obligation	0.1
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Aggregate accumulated benefit obligation	344.3	$ 312.2
Contribution to the plan	$ 7.3
Foreign Plan | Defined Benefit Pension Plans | Equity security funds
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Target asset allocation (as a percent)	30.00%
Foreign Plan | Defined Benefit Pension Plans | Debt security funds and other
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Target asset allocation (as a percent)	40.00%
Foreign Plan | Defined Benefit Pension Plans | Other Investments
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Target asset allocation (as a percent)	30.00%
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Assumed health care cost trend rate, initial rate (as a percent)	6.23%
Assumed health care cost trend rate, ultimate rate (as a percent)	4.50%
Effect of 1% point increase on service and interest cost components (less than)	$ 0.1
Effect of 1% point increase on accumulated postretirement benefit obligation	0.3
Effect of 1% point decrease on service and interest cost components (less than)	0.1
Effect of 1% point decrease on accumulated postretirement benefit obligation	$ 0.3

X

- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1 Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition The trend rate for health care cost associated with the defined benefits plan. + References No definition available. + Details Name: wab_DefinedBenefitPlanInitialHealthCareCostTrendRate Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Defined Benefit Plans And Other Postretirement Benefit Plans [ Line Items ] + References No definition available. + Details Name: wab_DefinedBenefitPlansAndOtherPostretirementBenefitPlansLineItems Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Defined Contribution Plan, Market value of the shares held on behalf of participants + References No definition available. + Details Name: wab_DefinedContributionPlanMarketValueOfSharesHeldOnBehalfOfParticipants Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Defined Contribution Plan, Number of shares held on behalf of participants. + References No definition available. + Details Name: wab_DefinedContributionPlanNumberOfSharesHeldOnBehalfOfParticipants Namespace Prefix: wab_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_OtherInvestmentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - U.S. and International Pension Plans With Accumulated and Projected Benefit Obligations in Excess of Plan Assets (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
United States
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ (44,213)	$ (45,512)
Accumulated benefit obligation	(43,340)	(44,530)
Fair value of plan assets	37,432	35,802
Projected benefit obligation	(44,213)	(45,512)
Fair value of plan assets	37,432	35,802
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	(282,077)	(255,682)
Accumulated benefit obligation	(274,557)	(249,729)
Fair value of plan assets	200,218	170,367
Projected benefit obligation	(283,106)	(256,530)
Fair value of plan assets	$ 201,115	$ 171,133

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details Name: us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details Name: us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details Name: us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefit obligation for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details Name: us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value of plan assets for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details Name: us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 344	$ 337	$ 381
Interest cost	1,422	1,475	1,914
Expected return on plan assets	(1,731)	(2,076)	(2,168)
Amortization of initial net obligation and prior service cost	3	3	3
Amortization of net loss	989	914	1,062
Settlement and curtailment losses recognized	0	0	0
Net periodic benefit cost	1,027	653	1,192
United States | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	4	9
Interest cost	350	389	1,233
Amortization of initial net obligation and prior service cost	(1,519)	(1,709)	(2,295)
Amortization of net loss	1,225	1,287	1,356
Net periodic benefit cost	61	(29)	303
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,740	1,379	2,015
Interest cost	7,310	5,774	7,091
Expected return on plan assets	(12,412)	(9,971)	(9,591)
Amortization of initial net obligation and prior service cost	27	61	212
Amortization of net loss	2,846	1,818	2,379
Settlement and curtailment losses recognized	768	218	0
Net periodic benefit cost	1,279	(721)	2,106
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	28	29	38
Interest cost	98	99	128
Amortization of initial net obligation and prior service cost	(7)	(7)	(7)
Amortization of net loss	(23)	(29)	(30)
Net periodic benefit cost	$ 96	$ 92	$ 129

X

- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanInterestCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanServiceCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Define benefit plan amortization of initial net obligation and prior service (credit) cost. + References No definition available. + Details Name: wab_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsAndPriorServiceCostCredit Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
United States | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the year	$ (84)
Effect of exchange rates	0
Amortization or curtailment recognition of prior service cost	(1,519)
Amortization or settlement recognition of net loss (gain)	1,225
Total recognized in other comprehensive income (loss)	(378)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	(317)
United States | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the year	2,477
Effect of exchange rates	0
Amortization, settlement, or curtailment recognition of net transition obligation	0
Amortization or curtailment recognition of prior service cost	3
Amortization or settlement recognition of net loss (gain)	989
Total recognized in other comprehensive income (loss)	3,469
Total recognized in net periodic benefit cost and other comprehensive income (loss)	2,442
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the year	(131)
Effect of exchange rates	16
Amortization or curtailment recognition of prior service cost	(7)
Amortization or settlement recognition of net loss (gain)	(23)
Total recognized in other comprehensive income (loss)	(145)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	(53)
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) arising during the year	3,683
Effect of exchange rates	(4,945)
Amortization, settlement, or curtailment recognition of net transition obligation	768
Amortization or curtailment recognition of prior service cost	27
Amortization or settlement recognition of net loss (gain)	2,846
Total recognized in other comprehensive income (loss)	2,379
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 1,100

X

- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAmortizationOfTransitionAssetObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details Name: us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amortization or settlement recognized as part of other comprehensive income for defined benefit Plans. + References No definition available. + Details Name: wab_OtherComprehensiveIncomeDefinedBenefitPlansAmortizationOrSettlementRecognitionOfNetLossGain Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The effect of exchange rates on other comprehensive income related to defined benefit plans. + References No definition available. + Details Name: wab_OtherComprehensiveIncomeDefinedBenefitPlansEffectOfExchangeRates Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Weighted Average Assumptions Used to Develop Actuarial Present Value of Projected Benefit Obligation (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.56%	3.95%	4.21%
Expected return on plan assets (as a percent)	4.95%	5.70%	5.70%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
United States | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.43%	3.76%	3.95%
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	2.40%	2.51%	3.56%
Expected return on plan assets (as a percent)	5.02%	6.07%	5.81%
Rate of compensation increase (as a percent)	2.54%	2.54%	3.10%
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.21%	3.46%	3.80%

X

- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Amounts Included in Other Comprehensive Loss That are Expected to be Recognized as Components of Periodic Benefit Costs (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
United States | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ 3
Net actuarial loss	970
Total recognized in net periodic benefit cost and other comprehensive (loss) income	973
United States | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(1,519)
Net actuarial loss	1,216
Total recognized in net periodic benefit cost and other comprehensive (loss) income	(303)
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	22
Net actuarial loss	2,193
Total recognized in net periodic benefit cost and other comprehensive (loss) income	2,215
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(7)
Net actuarial loss	(8)
Total recognized in net periodic benefit cost and other comprehensive (loss) income	$ (15)

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Pension Plan Assets by Asset Category (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 37,432	$ 35,802	$ 37,640
United States | Equity security funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,122	17,446
United States | Debt security funds and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,304	17,038
United States | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,006	1,318
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	281,602	241,283	$ 168,069
Foreign Plan | Equity security funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	100,453	92,201
Foreign Plan | Debt security funds and other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178,730	145,003
Foreign Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,419	$ 4,079

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Schedule of Pension Plan Assets Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
United States | Equity
Defined Benefit Plan Disclosure [Line Items]
NAV	$ 0	$ 0
Fair value of plan assets	18,122	17,446
United States | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,122	17,446
United States | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
NAV	0	0
Fair value of plan assets	18,304	17,038
United States | Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,273	4,766
United States | Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,031	12,272
United States | Debt Securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
NAV	0	0
Fair value of plan assets	1,006	1,318
United States | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,006	1,318
United States | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
NAV	4,586	3,589
Fair value of plan assets	319,033	277,085
Foreign Plan | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64,555	65,989
Foreign Plan | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	236,769	194,511
Foreign Plan | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,123	12,996
Foreign Plan | Equity
Defined Benefit Plan Disclosure [Line Items]
NAV	4,586	3,589
Fair value of plan assets	138,874	120,336
Foreign Plan | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38,647	38,053
Foreign Plan | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	95,641	78,694
Foreign Plan | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
NAV	0	0
Fair value of plan assets	111,204	90,508
Foreign Plan | Debt Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Debt Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	111,204	90,508
Foreign Plan | Debt Securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
NAV	0	0
Fair value of plan assets	2,507	4,406
Foreign Plan | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,507	4,406
Foreign Plan | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
NAV	0	0
Fair value of plan assets	29,016	26,033
Foreign Plan | Insurance Contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan | Insurance Contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,893	13,037
Foreign Plan | Insurance Contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 13,123	$ 12,996

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets + References No definition available. + Details Name: wab_DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_DomesticPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=wab_InsuranceContractsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Schedule of Reconciliation of Level 3 Assets (Details) - Defined Benefit Pension Plans - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	$ 12,996	$ 0
Net purchases, issuances, and settlements	778	56
Actual return on plan assets	375	(5)
Business acquisition		12,949
Opening balance sheet adjustment	(1,308)
Other	282	(4)
Fair value of plan assets at end of year	$ 13,123	$ 12,996

X

- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanFairValueOfPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Defined Benefit Plan, Plan Assets, Increase for Acquisitions + References No definition available. + Details Name: wab_DefinedBenefitPlanPlanAssetsIncreaseforAcquisitions Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Other + References No definition available. + Details Name: wab_DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseDecreaseOther Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Balance Sheet Adjustment + References No definition available. + Details Name: wab_DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseDecreaseforBalanceSheetAdjustment Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Benefit Payments Expected to be Paid to Plan Participants (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
United States | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2018	$ 3,250
2019	3,301
2020	3,325
2021	3,160
2022	3,125
2023 through 2027	14,276
United States | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
2018	1,046
2019	1,024
2020	986
2021	950
2022	908
2023 through 2027	3,956
Foreign Plan | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2018	12,401
2019	12,403
2020	13,156
2021	13,799
2022	14,538
2023 through 2027	77,817
Foreign Plan | Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
2018	208
2019	220
2020	225
2021	245
2022	251
2023 through 2027	$ 1,352

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedBenefitPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Costs Recognized Under Defined Contribution Plans and Multiemployer Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Multi-employer pension and health & welfare plans	$ 1,522	$ 2,054	$ 2,584
401(k) savings and other defined contribution plans	23,209	23,062	21,399
Total	$ 24,731	$ 25,116	$ 23,983

X

- References No definition available. + Details Name: us-gaap_CompensationAndRetirementDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details Name: us-gaap_DefinedContributionPlanCostRecognized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Cost recognized for 401(k) savings and other defined contribution plans under Defined Contribution Plans and Multiemployer Pension Plan + References No definition available. + Details Name: wab_CostsRecognizedUnderDefinedContributionPlansAndMultiemployerPensionPlans Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Multiemployer Plan, Cost + References No definition available. + Details Name: wab_MultiemployerPlanCost Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

EMPLOYEE BENEFIT PLANS - Contributions in Multiemployer Pension Plans (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Oct. 21, 2015	Jan. 01, 2013	Jun. 30, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Contributions by the Company				$ 1,521,000	$ 2,054,000	$ 2,584,000
Contribution to the plan (as a percent)				5.00%
Increasing in weekly pension fund contribution rates	$ 75
Surcharge imposed (as a percent)			5.00%
Defined Contribution Plan
Defined Contribution Plan Disclosure [Line Items]
Surcharge imposed (as a percent)		10.00%
Idaho Operating Engineers Employers Pension Trust Fund
Defined Contribution Plan Disclosure [Line Items]
EIN				916075538
Plan Number				001
Pension Protection Act Zone Status					Green	Green
FIP / RP Status Pending / Implemented				No
Contributions by the Company				$ 1,020,000	$ 1,306,000	$ 1,820,000
Surcharge Imposed				No
Expiration Dates of Collective Bargaining Agreements				Jun. 30, 2018
Automobile Mechanics Local Number Seven Hundred And One Union and Industry Pension Plan
Defined Contribution Plan Disclosure [Line Items]
EIN				366042061
Plan Number				001
Pension Protection Act Zone Status					Yellow	Red
FIP / RP Status Pending / Implemented				Implemented
Contributions by the Company				$ 501,000	$ 748,000	$ 764,000
Surcharge Imposed				Yes
Expiration Dates of Collective Bargaining Agreements				Jun. 01, 2018

X

- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details Name: dei_EntityTaxIdentificationNumber Namespace Prefix: dei_ Data Type: dei:nineDigitItemType Balance Type: na Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DefinedContributionPlanDisclosureLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details Name: us-gaap_MultiemployerPlanContributionsByEmployer Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_MultiemployerPlanNumber Namespace Prefix: us-gaap_ Data Type: us-types:threeDigitItemType Balance Type: na Period Type: duration

X

- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_MultiemployerPlansCertifiedZoneStatus Namespace Prefix: us-gaap_ Data Type: us-types:zoneStatusItemType Balance Type: na Period Type: duration

X

- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_MultiemployerPlansCollectiveBargainingArrangementExpirationDate Namespace Prefix: us-gaap_ Data Type: xbrli:dateItemType Balance Type: na Period Type: duration

X

- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_MultiemployerPlansFundingImprovementPlanAndRehabilitationPlan Namespace Prefix: us-gaap_ Data Type: us-types:fundingImprovementAndRehabilitationPlanItemType Balance Type: na Period Type: duration

X

- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details Name: us-gaap_MultiemployerPlansSurcharge Namespace Prefix: us-gaap_ Data Type: us-types:surchargeItemType Balance Type: na Period Type: duration

X

- Definition Defined contribution plan percentage of contribution. + References No definition available. + Details Name: wab_DefinedContributionPlanPercentageOfContribution Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Defined contribution plans increase decrease in contribution rate. + References No definition available. + Details Name: wab_DefinedContributionPlansIncreaseDecreaseInContributionRate Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Multiemployer plans, surcharge imposed. + References No definition available. + Details Name: wab_MultiemployerPlansSurchargeImposed Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_RetirementPlanTypeAxis=wab_DefinedContributionPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CollectiveBargainingArrangementAxis=wab_IdahoOperatingEngineersEmployersPensionTrustFundMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CollectiveBargainingArrangementAxis=wab_AutomobileMechanicsLocalNumberSevenHundredAndOneUnionAndIndustryPensionPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

INCOME TAXES - Components of Income from Operations before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 140,325	$ 276,218	$ 461,394
Foreign	211,738	136,619	123,974
Income from operations before income taxes	$ 352,063	$ 412,837	$ 585,368

X

- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_IncomeTaxDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

INCOME TAXES - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net tax expense recorded	$ 4,300
Provisional expense for U.S. tax reform bill	55,000
Net benefit for revaluation of deferred tax assets and liabilities	50,700
Provisional benefit for net deferred taxes	24,600
Transition tax expense	$ 51,800
France tax rate change (as a percent)	6.50%	6.50%	(0.00%)
U.S. tax rate change	7.90%	(0.00%)	(0.00%)
U.S. tax reform provision	15.60%	0.00%	0.00%
Transaction costs related to acquisitions	0.00%	1.50%	0.00%
Valuation allowance for foreign carryforwards	$ 25,700
Net operating loss carryforwards	65,700
Unrecognized tax benefits	6,910	$ 8,423	$ 10,557	$ 12,596
Unrecognized tax benefits if recognized that would affect effective tax rate	4,400	4,200
Accrued interest	700	800
Accrued penalties	100	$ 300
Unrecognized tax benefits subject to change within the next 12 months	$ 5,200

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_IncomeTaxDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details Name: us-gaap_IncomeTaxExaminationInterestAccrued Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details Name: us-gaap_IncomeTaxExaminationPenaltiesAccrued Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details Name: us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details Name: us-gaap_OperatingLossCarryforwards Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details Name: us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefits Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Effective Income Tax Rate Reconciliation, Acquisition of Business, Percent + References No definition available. + Details Name: wab_EffectiveIncomeTaxRateReconciliationAcquisitionofBusinessPercent Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Effective Income Tax Rate Reconciliation, France Income Tax Rate Differential + References No definition available. + Details Name: wab_EffectiveIncomeTaxRateReconciliationFranceIncomeTaxRateDifferential Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense + References No definition available. + Details Name: wab_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset and Liabilities, Provisional Income Tax Expense (Benefit) + References No definition available. + Details Name: wab_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetandLiabilitiesProvisionalIncomeTaxExpenseBenefit Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details Name: wab_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense + References No definition available. + Details Name: wab_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Valuation allowance on foreign carry forwards. + References No definition available. + Details Name: wab_ValuationAllowanceForForeignTaxCreditCarryforwards Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

INCOME TAXES - Consolidated Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current taxes
Federal	$ 86,157	$ 72,317	$ 141,245
State	3,644	9,953	16,072
Foreign	67,395	27,391	24,442
Current taxes	157,196	109,661	181,759
Deferred taxes
Federal	(22,863)	11,013	9,606
State	(1,024)	1,953	770
Foreign	(43,536)	(23,194)	(5,395)
Deferred taxes	(67,423)	(10,228)	4,981
Total provision	$ 89,773	$ 99,433	$ 186,740

X

- References No definition available. + Details Name: us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_CurrentFederalTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_CurrentForeignTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_CurrentIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_CurrentStateAndLocalTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_DeferredFederalIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_DeferredFederalStateAndLocalTaxExpenseBenefitAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_DeferredForeignIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_DeferredIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details Name: us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

INCOME TAXES - Reconciliation of Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%
State taxes	0.40%	2.10%	2.00%
Tax reserves	0.00%	(0.20%)	(0.40%)
Foreign	(8.30%)	(4.30%)	(2.10%)
Research and development credit	(0.80%)	(1.00%)	(0.40%)
Manufacturing deduction	(1.10%)	(1.80%)	(2.30%)
France tax rate change	(6.50%)	(6.50%)	0.00%
U.S. tax rate change	(7.90%)	0.00%	0.00%
U.S. tax reform provision	15.60%	0.00%	0.00%
Transaction costs related to acquisitions	0.00%	1.50%	0.00%
Other, net	(0.90%)	(0.70%)	0.10%
Effective rate	25.50%	24.10%	31.90%

X

- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateContinuingOperations Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details Name: us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_IncomeTaxDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Effective Income Tax Rate Reconciliation, Acquisition of Business, Percent + References No definition available. + Details Name: wab_EffectiveIncomeTaxRateReconciliationAcquisitionofBusinessPercent Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Effective Income Tax Rate Reconciliation, France Income Tax Rate Differential + References No definition available. + Details Name: wab_EffectiveIncomeTaxRateReconciliationFranceIncomeTaxRateDifferential Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Effective income tax rate reconciliation tax reserves. + References No definition available. + Details Name: wab_EffectiveIncomeTaxRateReconciliationTaxReserves Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

v3.8.0.1

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Accrued expenses and reserves	$ 10,961	$ 26,117
Warranty reserve	20,211	24,131
Deferred compensation/employee benefits	18,353	25,755
Pension and postretirement obligations	21,637	25,595
Inventory	19,620	22,579
Net operating loss carry forwards	65,671	59,416
Tax credit carry forwards	1,921	621
Other	13,053	2,317
Gross deferred income tax assets	171,427	186,531
Valuation allowance	25,683	21,418
Total deferred income tax assets	145,744	165,113
Deferred income tax liabilities:
Property, plant & equipment	37,015	47,321
Intangibles	288,141	359,312
Total deferred income tax liabilities	325,156	406,633
Total deferred income tax liabilities	$ (179,412)	$ (241,520)

X

- References No definition available. + Details Name: us-gaap_ComponentsOfDeferredTaxAssetsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_DeferredIncomeTaxLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_DeferredTaxAssetsGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details Name: us-gaap_DeferredTaxAssetsInventory Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_DeferredTaxAssetsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details Name: us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details Name: us-gaap_DeferredTaxAssetsTaxCreditCarryforwards Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details Name: us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from employee benefits, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details Name: us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details Name: us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_DeferredTaxAssetsValuationAllowance Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details Name: us-gaap_DeferredTaxLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details Name: us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details Name: us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Pension and post-retirement obligation component of Deferred income tax asset. + References No definition available. + Details Name: wab_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Accrued expenses and reserves component of deferred income tax asset. + References No definition available. + Details Name: wab_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedExpensesAndReserves Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.8.0.1

INCOME TAXES - Liability for Income Taxes Associated with Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross liability for unrecognized tax benefits at beginning of year	$ 8,423	$ 10,557	$ 12,596
Gross increases - unrecognized tax benefits in prior periods	2,466	6	0
Gross increases - current period unrecognized tax benefits	0	0	1,682
Gross decreases - unrecognized tax benefits in prior periods	0	0	0
Gross decreases - audit settlement during year	(3,979)	0	(3,027)
Gross decreases - expiration of audit statute of limitations	0	(2,140)	(694)
Gross liability for unrecognized tax benefits at end of year	$ 6,910	$ 8,423	$ 10,557

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefits Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details Name: us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

EARNINGS PER SHARE - Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator
Net income attributable to Wabtec shareholders	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 46,328	$ 82,428	$ 90,485	$ 94,163	$ 262,261	$ 304,887	$ 398,628
Less: dividends declared - common shares and non-vested restricted stock									(42,218)	(32,430)	(26,963)
Undistributed earnings									$ 220,043	$ 272,457	$ 371,665
Percentage allocated to common shareholders (as a percent)									99.70%	99.70%	99.70%
Undistributed earnings allocated to common shareholders									$ 219,383	$ 271,640	$ 370,550
Add: dividends declared - common shares									42,092	32,333	26,875
Numerator for basic and diluted earnings per common share									$ 261,475	$ 303,973	$ 397,425
Denominator
Denominator for basic earnings per common share - weighted average shares (in shares)									95,453	90,359	96,074
Assumed conversion of dilutive stock-based compensation plans (in shares)									672	782	932
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares)									96,125	91,141	97,006
Net income per common share attributable to Wabtec shareholders
Net income attributable to Wabtec shareholders, basic (in dollars per share)	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 0.42	$ 0.92	$ 1.00	$ 1.03	$ 2.74	$ 3.37	$ 4.14
Net income attributable to Wabtec shareholders (in dollars per share)	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 0.42	$ 0.91	$ 1.00	$ 1.02	$ 2.72	$ 3.34	$ 4.10
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares)									95,740	90,627	96,388

X

- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details Name: us-gaap_DividendsCash Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareBasic Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareBasicAndDilutedAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareBasicOtherDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareDiluted Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1500-109256 + Details Name: us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2793-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2814-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2740-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780133-109256 + Details Name: us-gaap_UndistributedEarnings Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Basic weighted average common shares outstanding and non vested restricted stock expected to vest. + References No definition available. + Details Name: wab_BasicWeightedAverageCommonSharesOutstandingAndNonVestedRestrictedStockExpectedToVest Namespace Prefix: wab_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Dividends declared common shares. + References No definition available. + Details Name: wab_DividendsDeclaredCommonShares Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Numerator for basic and diluted earnings per common share. + References No definition available. + Details Name: wab_NumeratorForBasicAndDilutedEarningsPerCommonShare Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Percentage allocated to common shareholders. + References No definition available. + Details Name: wab_PercentageOfNetIncomeAllocatedToCommonShareholders Namespace Prefix: wab_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition The amount of undistributed earnings allocated to common shareholders for the periods presented. + References No definition available. + Details Name: wab_UndistributedEarningsAllocatedToCommonShareholders Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.8.0.1

EARNINGS PER SHARE - Narrative (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Shares not included in computation of diluted earnings per share	24	20	13

X

- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_EarningsPerShareAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

STOCK-BASED COMPENSATION PLANS - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 21.3	$ 20.8	$ 26.0
Tax benefits related to stock-based compensation plans			8.9	$ 14.9	$ 15.3
Unamortized compensation expense expected to be vested			$ 24.6
Recognized weighted average period, years			1 year 2 months
Risk-free interest rate, year			7 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 1.7
Non-Vested Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			7.0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 4.6
Incentive Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years
Stock-based compensation expense			$ 6.5
Percentage of incentive stock awards expected to be vested and awarded of stocks granted			84.00%
Incentive Stock Awards | Scenario Forecast
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of incentive stock awards expected to be vested and awarded of stocks granted	91.00%	77.00%
Incentive Stock Awards | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of incentive stock awards expected to be vested and awarded of stocks granted			0.00%
Incentive Stock Awards | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of incentive stock awards expected to be vested and awarded of stocks granted			200.00%
Directors Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued			881,192
Stock-based compensation expense			$ 1.5
Directors Plan | Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan term, years			10 years
Shares authorized for grants			1,000,000
Award vesting period			3 years
Directors Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			1 year
Shares issued			16,500	16,972	11,256
Directors Plan | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			1 year
Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant			3,192,453
Plan 2011 | Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan term, years			10 years
Award vesting period			4 years
Plan 2011 | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years
Plan 2000 | Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan term, years			10 years
Award vesting period			4 years
Plan 2000 | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years

X

- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_AllocatedShareBasedCompensationExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Share based compensation arrangement by share based payment award fair value assumptions risk free interest rate expected life. + References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateExpectedLife Namespace Prefix: wab_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_AwardTypeAxis=wab_NonVestedRestrictedStockMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PlanNameAxis=wab_DirectorsPlanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PlanNameAxis=wab_PlanTwoThousandElevenMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PlanNameAxis=wab_PlanTwoThousandMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

STOCK-BASED COMPENSATION PLANS - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options
Outstanding, beginning of period (in shares)	1,098,823	1,097,323	1,147,558
Granted (in shares)	65,522	94,115	84,675
Exercised (in shares)	(166,838)	(83,790)	(124,156)
Canceled (in shares)	(13,995)	(8,825)	(10,754)
Outstanding, end of period (in shares)	983,512	1,098,823	1,097,323	1,147,558
Exercisable at December 31, 2017	802,609
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 35.39	$ 32.70	$ 28.33
Granted (in dollars per share)	86.91	61.39	87.35
Exercised (in dollars per share)	21.37	25.58	26.70
Canceled (in dollars per share)	76.89	71.47	65.22
Outstanding, end of period (in dollars per share)	40.62	$ 35.39	$ 32.70	$ 28.33
Exercisable at December 31, 2017 (in dollars per share)	$ 32.52
Weighted Average Remaining Contractual Life
Weighted- Average Remaining Contractual Life, outstanding	4 years	4 years 3 months	4 years 9 months	5 years 6 months
Weighted Average Remaining Contractual Life, Exercisable shares at December 31, 2017	3 years 3 months
Aggregate Intrinsic Value
Outstanding, beginning of period	$ 52,332	$ 42,154	$ 67,205
Granted	0	2,035	1,375
Exercised	(10,020)	(4,813)	(5,516)
Canceled	(64)	(102)	(64)
Outstanding, end of period	40,137	$ 52,332	$ 42,154	$ 67,205
Exercisable at December 31, 2017	$ 36,848

X

- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueRollForward Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Intrinsic value of granted options for the period presented. + References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedIntrinsicValue Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Share Based Compensation Arrangement by Share-based Payment Award, Options, Canceled, Intrinsic Value + References No definition available. + Details Name: wab_ShareBasedCompensationArrangementbySharebasedPaymentAwardOptionsCanceledIntrinsicValue Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.8.0.1

STOCK-BASED COMPENSATION PLANS - Stock Options Outstanding (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	983,512
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 40.62
Number of options currently exercisable (in shares) | shares	802,609
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 32.52
Under $15.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	180,000
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 14.50
Weighted average remaining contractual life (in years)	1 year 1 month
Number of options currently exercisable (in shares) | shares	180,000
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 14.50
15.00 - 23.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	193,701
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 18.77
Weighted average remaining contractual life (in years)	1 year 3 months
Number of options currently exercisable (in shares) | shares	193,701
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 18.77
23.00 - 30.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	136,924
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 28.75
Weighted average remaining contractual life (in years)	2 years 9 months
Number of options currently exercisable (in shares) | shares	136,924
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 28.75
30.00 - 38.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	94,496
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 35.24
Weighted average remaining contractual life (in years)	4 years 1 month
Number of options currently exercisable (in shares) | shares	94,496
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 35.24
Over 38.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of options outstanding (in shares) | shares	378,391
Weighted average exercise price of options outstanding (in dollars per share) | $ / shares	$ 69.86
Weighted average remaining contractual life (in years)	7 years
Number of options currently exercisable (in shares) | shares	197,488
Weighted average exercise price of options currently exercisable (in dollars per share) | $ / shares	$ 63.72

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=wab_ExercisePriceRangeOneMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=wab_ExercisePriceRangeTwoMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=wab_ExercisePriceRangeThreeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=wab_ExercisePriceRangeFourMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=wab_ExercisePriceRangeFiveMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

STOCK-BASED COMPENSATION PLANS - Fair Value of Each Option Grant Weighted Average Assumptions (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Dividend yield (as a percent)	0.23%	0.26%	0.14%
Risk-free interest rate (as a percent)	2.20%	1.50%	1.80%
Stock price volatility (as a percent)	23.40%	26.90%	27.30%
Expected life (years)	5 years	5 years	5 years
Weighted average fair value of options granted during the year (in dollars per share)	$ 20.69	$ 14.96	$ 24.41

X

- References No definition available. + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

v3.8.0.1

STOCK-BASED COMPENSATION PLANS - Restricted Stock Activity and Incentive Stock Awards Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 72.18	$ 65.89	$ 47.97
Granted (in dollars per share)	86.66	66.03	87.90
Vested (in dollars per share)	70.34	51.80	37.76
Adjustment for incentive stock awards expected to vest (in dollars per share)	73.69	74.42	57.57
Canceled (in dollars per share)	76.61	71.84	67.05
Outstanding, end of period (in dollars per share)	$ 78.76	$ 72.18	$ 65.89
Restricted Stock and Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	396,295	356,885.000	438,543
Granted (in shares)	153,516	212,600	113,945
Vested (in shares)	(137,088)	(159,975)	(182,776)
Adjustment for incentive stock awards expected to vest (in shares)	0	0	0
Canceled (in shares)	(13,723)	(13,215)	(12,827)
Outstanding, end of period (in shares)	399,000	396,295	356,885.000
Incentive Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	424,750	541,638	791,608
Granted (in shares)	157,025	167,850	126,050
Vested (in shares)	(153,271)	(236,591)	(433,932)
Adjustment for incentive stock awards expected to vest (in shares)	(87,592)	(38,164)	65,666
Canceled (in shares)	(13,579)	(9,983)	(7,754)
Outstanding, end of period (in shares)	327,333	424,750	541,638

X

- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Share based compensation arrangement by share based payment award equity instruments other than options net performance adjustment weighted average net performance adjustment fair value. + References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetPerformanceAdjustmentWeightedAverageNetPerformanceAdjustmentFairValue Namespace Prefix: wab_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Share based compensation arrangement by share based payment award equity instruments other than options nonvested number expected to vest. + References No definition available. + Details Name: wab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExpectedToVest Namespace Prefix: wab_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=wab_RestrictedStockAndUnitsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Foreign currency translation gain (loss)	$ 5,063	$ (321,033)
Unrealized gain (loss) on interest rate swap contracts, net of tax of $1,338 and $1,540	4,015	(2,957)
Unrealized loss on pension and post-retirement benefit plans, net of tax of $19,532 and $20,832	(54,070)	(55,615)
Total accumulated other comprehensive loss	(44,992)	(379,605)
Unrealized loss on interest rate swap contracts, tax	1,338	1,540
Pension benefit plans and post retirement benefit plans, tax	$ 19,532	$ 20,832

X

- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_StatementOfFinancialPositionAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Pension benefit plans and post retirement benefit plans, tax included in accumulated other comprehensive income loss. + References No definition available. + Details Name: wab_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Unrealized (gain) loss on interest rate swap contracts, tax included in accumulated other comprehensive income loss. + References No definition available. + Details Name: wab_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnInterestRateSwapContractsTax Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.8.0.1

OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 2,976,825	$ 1,701,339
Other comprehensive income before reclassifications	331,791	(105,844)
Amounts reclassified from accumulated other comprehensive income	2,822	2,958
Net current period other comprehensive income	334,613	(102,886)
Balance end of period	2,828,532	2,976,825
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(321,033)	(227,349)
Other comprehensive income before reclassifications	326,096	(93,684)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income	326,096	(93,684)
Balance end of period	5,063	(321,033)
Derivative Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(2,957)	(2,987)
Other comprehensive income before reclassifications	6,712	(1,286)
Amounts reclassified from accumulated other comprehensive income	260	1,316
Net current period other comprehensive income	6,972	30
Balance end of period	4,015	(2,957)
Pension and post retirement benefits plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(55,615)	(46,383)
Other comprehensive income before reclassifications	(1,017)	(10,874)
Amounts reclassified from accumulated other comprehensive income	2,562	1,642
Net current period other comprehensive income	1,545	(9,232)
Balance end of period	(54,070)	(55,615)
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(379,605)	(276,719)
Balance end of period	$ (44,992)	$ (379,605)

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_AOCIAttributableToParentNetOfTaxRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details Name: us-gaap_OtherComprehensiveIncomeLossNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details Name: us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details Name: us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Cost of sales									$ 2,816,443	$ 2,006,949	$ 2,260,182
Income from Operations									352,063	412,837	585,368
Interest expense, net									(68,704)	(42,561)	(16,888)
Income tax expense									(89,773)	(99,433)	(186,740)
Net income attributable to Wabtec shareholders	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 46,328	$ 82,428	$ 90,485	$ 94,163	262,261	304,887	$ 398,628
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Cost of sales									(1,496)	(1,652)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Cost of sales									5,037	3,989
Reclassification out of Accumulated Other Comprehensive Income | Pension And Post Retirement Benefit Plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Income from Operations									3,541	2,337
Income tax expense									(979)	(695)
Net income attributable to Wabtec shareholders									2,562	1,642
Reclassification out of Accumulated Other Comprehensive Income | Derivative Contracts
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest expense, net									400	1,873
Income tax expense									(140)	(557)
Net income attributable to Wabtec shareholders									$ 260	$ 1,316

X

- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_CostOfGoodsAndServicesSold Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_InterestIncomeExpenseNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeOnDerivativesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis=us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

OPERATING LEASES - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Net rental expense	$ 34.6	$ 27.2	$ 20.2
Minimum
Operating Leased Assets [Line Items]
Operating leases term, in years	1 year
Maximum
Operating Leased Assets [Line Items]
Operating leases term, in years	15 years

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_OperatingLeasedAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details Name: us-gaap_OperatingLeasesRentExpenseNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Lease expiration. + References No definition available. + Details Name: wab_LeaseExpiration Namespace Prefix: wab_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_RangeAxis=us-gaap_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_RangeAxis=us-gaap_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

OPERATING LEASES - Future Minimum Rental Payments Under Operating Leases (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]
2018	$ 31,647
2019	27,782
2020	25,242
2021	20,073
2022	16,621
2023 and after	66,041
Real Estate
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]
2018	28,957
2019	25,857
2020	24,266
2021	19,561
2022	16,350
2023 and after	66,017
Equipment
Future Minimum Payments Under Non-Cancelable Operating Leases With Initial Terms Of One-Year Or More [Line Items]
2018	2,690
2019	1,925
2020	976
2021	512
2022	271
2023 and after	$ 24

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details Name: us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Future minimum payments under non cancelable operating leases with initial terms of one year or more. + References No definition available. + Details Name: wab_FutureMinimumPaymentsUnderNonCancelableOperatingLeasesWithInitialTermsOfOneYearOrMoreLineItems Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandAndBuildingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

WARRANTIES - Changes in Product Warranty Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of year	$ 138,992	$ 92,064
Warranty expense	50,385	28,947
Acquisitions	806	59,685
Warranty claim payments	(48,548)	(38,772)
Foreign currency impact	11,428	(2,932)
Balance at end of year	$ 153,063	$ 138,992

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_ProductWarrantyAccrual Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of increase in the standard and extended product warranty accrual from a business acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details Name: us-gaap_ProductWarrantyAccrualAdditionsFromBusinessAcquisition Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details Name: us-gaap_ProductWarrantyAccrualPayments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase in the standard and extended product warranty accrual from warranties issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details Name: us-gaap_ProductWarrantyAccrualWarrantiesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the standard and extended product warranty accrual. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details Name: us-gaap_StandardAndExtendedProductWarrantyAccrualForeignCurrencyTranslationGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.8.0.1

PREFERRED STOCK - Narrative (Detail) - shares	Dec. 31, 2017	Dec. 31, 2016
Disclosure Preferred Stock Additional Information [Abstract]
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

X

- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockSharesAuthorized Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockSharesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_PreferredStockSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Disclosure preferred stock additional information. + References No definition available. + Details Name: wab_DisclosurePreferredStockAdditionalInformationAbstract Namespace Prefix: wab_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.8.0.1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Accumulated other comprehensive income loss	$ (4,015)	$ 2,957
Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreement, current liability	$ 1,163	$ 3,888
Not Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Derivative term (in years)	1 year
Net gain	$ 2,100
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Derivative term (in years)	2 years
Amount reclassified into income	$ 400
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap agreements
Derivative [Line Items]
Interest rate swap agreement, current liability	1,200
Accumulated other comprehensive income loss	$ 700

X

- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details Name: us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details Name: us-gaap_DerivativeLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details Name: us-gaap_DerivativeTermOfContract Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_UnrealizedGainLossOnDerivatives Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Summary of Notional Amounts and Fair Value (Details) $ in Millions	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Gross notional amount	$ 1,184.8
Derivative, Fair Value, Net	5.6
Other current assets
Derivative [Line Items]
Derivative asset fair value	5.6
Other current liabilities
Derivative [Line Items]
Liabilities at fair value	0.0
Designated as Hedging Instrument
Derivative [Line Items]
Gross notional amount	805.1
Derivative, Fair Value, Net	3.5
Designated as Hedging Instrument | Other current assets
Derivative [Line Items]
Derivative asset fair value	3.5
Designated as Hedging Instrument | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	0.0
Not Designated as Hedging Instrument
Derivative [Line Items]
Gross notional amount	379.7
Derivative, Fair Value, Net	2.1
Not Designated as Hedging Instrument | Other current assets
Derivative [Line Items]
Derivative asset fair value	2.1
Not Designated as Hedging Instrument | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	$ 0.0

X

- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details Name: invest_DerivativeNotionalAmount Namespace Prefix: invest_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details Name: us-gaap_DerivativeFairValueOfDerivativeAsset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details Name: us-gaap_DerivativeFairValueOfDerivativeLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details Name: us-gaap_DerivativeFairValueOfDerivativeNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentLiabilitiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, carrying value	$ 1,163	$ 3,888
Liabilities at fair value	1,163	3,888
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, carrying value	1,163	3,888
Fair Value, Measurements, Recurring | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	1,163	3,888
Fair Value, Measurements, Recurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Fair Value, Measurements, Recurring | Interest rate swap agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, carrying value	1,163	3,888
Fair Value, Measurements, Recurring | Interest rate swap agreements | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Fair Value, Measurements, Recurring | Interest rate swap agreements | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	1,163	3,888
Fair Value, Measurements, Recurring | Interest rate swap agreements | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities at fair value	$ 0	$ 0

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details Name: us-gaap_DerivativeFairValueOfDerivativeLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details Name: us-gaap_DerivativeLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values and Related Carrying Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
4.375% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Note, carrying value	$ 248,567	$ 248,310
Note, fair value	$ 262,033	260,265
Stated interest rate (as a percent)	4.375%
3.45% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Note, carrying value	$ 747,655	747,474
Note, fair value	$ 741,113	719,273
Stated interest rate (as a percent)	3.45%
Interest rate swap agreements
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative, carrying value	$ 1,163	3,888
Derivative, fair value	$ 1,163	$ 3,888

X

- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_DebtInstrumentInterestRateStatedPercentage Namespace Prefix: us-gaap_ Data Type: num:percentItemType Balance Type: na Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details Name: us-gaap_DerivativeFairValueOfDerivativeLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details Name: us-gaap_DerivativeLiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_NotesPayableFairValueDisclosure Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_FourPointThreeSevenFivePercentSeniorNotesDueTwoThousandTwentyThreeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DebtInstrumentAxis=wab_SeniorNotesDue2026Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

COMMITMENTS AND CONTINGENCIES - Narrative (Details)				12 Months Ended
	Sep. 08, 2017 USD ($)	Nov. 02, 2016 patent	Apr. 21, 2016 patent	Dec. 31, 2017 USD ($) claim
Pending Litigation
Loss Contingencies [Line Items]
Pending litigation cases				0
Siemens Industry, Inc. | Pending Litigation
Loss Contingencies [Line Items]
Patents allegedly infringed | patent		6	7
Denver Transit Delivery of Train Management System | Threatened Litigation | Subsidiaries
Loss Contingencies [Line Items]
Alleged damages | $				$ 0
Denver Transit Installation of Constant Wireless Crossings | Threatened Litigation | Subsidiaries
Loss Contingencies [Line Items]
Alleged damages | $	$ 36,800,000
Denver Transit | Threatened Litigation | Subsidiaries
Loss Contingencies [Line Items]
Claims filed				0
Asbestos Related Cases | Settled Litigation
Loss Contingencies [Line Items]
Arbitration decisions				2

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_LossContingenciesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of claims settled. + References No definition available. + Details Name: us-gaap_LossContingencyClaimsSettledNumber Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details Name: us-gaap_LossContingencyDamagesSoughtValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details Name: us-gaap_LossContingencyNewClaimsFiledNumber Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Number of another entity's patents that the entity has allegedly infringed. + References No definition available. + Details Name: us-gaap_LossContingencyPatentsAllegedlyInfringedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details Name: us-gaap_LossContingencyPendingClaimsNumber Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

X

- Details Name: us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationCaseAxis=wab_SiemensIndustryInc.Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationCaseAxis=wab_DenverTransitDeliveryofTrainManagementSystemMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationStatusAxis=us-gaap_ThreatenedLitigationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_OwnershipAxis=us-gaap_SubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationCaseAxis=wab_DenverTransitInstallationofConstantWirelessCrossingsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationCaseAxis=wab_DenverTransitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LossContingenciesByNatureOfContingencyAxis=wab_AsbestosRelatedCasesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LitigationStatusAxis=us-gaap_SettledLitigationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

SEGMENT INFORMATION - Narrative (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segment | segment	2
United States
Segment Reporting Information [Line Items]
Export sales | $	$ 448.0	$ 470.5	$ 508.4

X

- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details Name: us-gaap_NumberOfReportableSegments Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_SegmentReportingInformationLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Goods or services sold to a foreign country. + References No definition available. + Details Name: wab_ExportSales Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_StatementGeographicalAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

SEGMENT INFROMATION - Segment Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total sales	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 759,982	$ 675,574	$ 723,601	$ 772,031	$ 3,881,756	$ 2,931,188	$ 3,307,998
Income (loss) from operations	91,163	$ 102,011	$ 113,701	$ 114,858	62,800	$ 120,096	$ 133,284	$ 142,181	421,733	458,361	607,567
Interest expense and other, net									(69,670)	(45,524)	(22,199)
Income (loss) from operations before income taxes									352,063	412,837	585,368
Depreciation and amortization									103,248	69,795	64,734
Capital expenditures									89,466	50,216	49,428
Segment assets	6,579,980				6,581,018				6,579,980	6,581,018	3,229,513
Freight Segment
Segment Reporting Information [Line Items]
Total sales									1,396,588	1,543,098	2,054,715
Transit Segment
Segment Reporting Information [Line Items]
Total sales									2,485,168	1,388,090	1,235,283
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales									1,434,218	1,582,617	2,090,087
Income (loss) from operations									264,603	344,455	482,640
Interest expense and other, net									0	0	0
Income (loss) from operations before income taxes									264,603	344,455	482,640
Depreciation and amortization									43,721	36,519	36,834
Capital expenditures									33,921	22,726	24,715
Segment assets	3,504,289				2,949,668				3,504,289	2,949,668	2,708,724
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales									2,506,716	1,397,483	1,264,178
Income (loss) from operations									188,546	171,446	150,988
Interest expense and other, net									0	0	0
Income (loss) from operations before income taxes									188,546	171,446	150,988
Depreciation and amortization									57,441	31,545	26,196
Capital expenditures									50,762	20,987	22,996
Segment assets	7,562,122				6,720,302				7,562,122	6,720,302	2,202,614
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total sales									(59,178)	(48,912)	(46,267)
Intersegment Eliminations | Freight Segment
Segment Reporting Information [Line Items]
Total sales									37,630	39,519	35,372
Intersegment Eliminations | Transit Segment
Segment Reporting Information [Line Items]
Total sales									21,548	9,393	10,895
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales									(59,178)	(48,912)	(46,267)
Income (loss) from operations									(31,416)	(57,540)	(26,061)
Interest expense and other, net									(69,670)	(45,524)	(22,199)
Income (loss) from operations before income taxes									(101,086)	(103,064)	(48,260)
Depreciation and amortization									2,086	1,731	1,704
Capital expenditures									4,783	6,503	1,717
Segment assets	$ (4,486,431)				$ (3,088,952)				$ (4,486,431)	$ (3,088,952)	$ (1,681,825)

X

- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_Assets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details Name: us-gaap_DepreciationAndAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details Name: us-gaap_OperatingIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_SegmentReportingInformationLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of interest expense and other revenue and expenses that are associated with the entity's normal revenue producing operation. + References No definition available. + Details Name: wab_InterestExpenseAndOtherNet Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_FreightSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=wab_TransitSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

SEGMENT INFORMATION - Geographic Area Data (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 759,982	$ 675,574	$ 723,601	$ 772,031	$ 3,881,756	$ 2,931,188	$ 3,307,998
Long-Lived Assets	573,972				518,376				573,972	518,376	353,193
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									1,323,781	1,362,255	1,754,924
Long-Lived Assets	211,608				205,895				211,608	205,895	171,362
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									356,493	322,563	368,505
Long-Lived Assets	57,668				54,215				57,668	54,215	63,694
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									279,013	206,258	204,674
Long-Lived Assets	5,822				5,156				5,822	5,156	4,876
France
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									237,454	66,287	45,565
Long-Lived Assets	57,849				33,636				57,849	33,636	7,194
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									208,817	98,364	92,422
Long-Lived Assets	71,709				57,902				71,709	57,902	31,642
China
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									178,137	106,357	100,586
Long-Lived Assets	36,388				42,672				36,388	42,672	12,256
Mexico
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									160,029	183,583	190,034
Long-Lived Assets	9,117				8,766				9,117	8,766	8,839
Italy
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									142,037	45,771	38,164
Long-Lived Assets	30,329				27,253				30,329	27,253	15,170
India
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									137,837	24,161	12,345
Long-Lived Assets	12,519				1,271				12,519	1,271	1,946
Australia
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									136,127	82,099	86,809
Long-Lived Assets	10,483				8,039				10,483	8,039	8,424
Brazil
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									69,378	51,493	84,595
Long-Lived Assets	13,184				13,227				13,184	13,227	9,318
Other international
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									652,653	381,997	329,375
Long-Lived Assets	$ 57,296				$ 60,344				$ 57,296	$ 60,344	$ 18,472

X

- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_PropertyPlantAndEquipmentNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_StatementGeographicalAxis=country_US Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_GB Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_CA Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_FR Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_DE Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_CN Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_MX Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_IT Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_IN Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_AU Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=country_BR Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementGeographicalAxis=wab_OtherInternationalMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

SEGMENT INFORMATION - Sales by Product (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Total sales	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 759,982	$ 675,574	$ 723,601	$ 772,031	$ 3,881,756	$ 2,931,188	$ 3,307,998
Specialty Products & Electronics
Revenue from External Customer [Line Items]
Total sales									1,350,727	1,374,580	1,733,881
Brake Products
Revenue from External Customer [Line Items]
Total sales									749,959	588,081	627,552
Remanufacturing, Overhaul & Build
Revenue from External Customer [Line Items]
Total sales									522,275	559,284	606,624
Transit Products
Revenue from External Customer [Line Items]
Total sales									1,112,340	276,124	189,581
Other
Revenue from External Customer [Line Items]
Total sales									$ 146,455	$ 133,119	$ 150,360

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_ProductOrServiceAxis=wab_ElectronicsAndOtherFreightRelatedProductsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ProductOrServiceAxis=wab_BrakeProductsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ProductOrServiceAxis=wab_RemanufacturingOverhaulAndBuildMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ProductOrServiceAxis=wab_TransitProductsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ProductOrServiceAxis=wab_AllOtherMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 233,401	$ 398,484	$ 226,191	$ 425,849
Receivables, net	1,166,787	942,508
Inventories	742,634	658,510
Current assets - other	122,291	868,129
Total current assets	2,265,113	2,867,631
Property, plant and equipment	573,972	518,376	353,193
Goodwill	2,460,103	2,078,765
Investment in subsidiaries	0	0
Other intangibles, net	1,204,432	1,053,860
Other noncurrent assets	76,360	62,386
Total Assets	6,579,980	6,581,018	3,229,513
Current liabilities	1,573,330	1,446,639
Inter-company	0	0
Long-term debt	1,823,303	1,762,967
Long-term liabilities - other	354,815	394,587
Total liabilities	3,751,448	3,604,193
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	2,808,868	2,205,977
Noncontrolling interest	19,664	770,848
Total equity	2,828,532	2,976,825	1,701,339	1,808,974
Total Liabilities and Equity	6,579,980	6,581,018
Elimination
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Inventories	0	0
Current assets - other	0	0
Total current assets	0	0
Property, plant and equipment	0	0
Goodwill	0	0
Investment in subsidiaries	(9,087,596)	(6,713,763)
Other intangibles, net	0	0
Other noncurrent assets	0	0
Total Assets	(9,087,596)	(6,713,763)
Current liabilities	0	0
Inter-company	0	0
Long-term debt	0	0
Long-term liabilities - other	0	0
Total liabilities	0	0
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	(9,087,596)	(6,713,763)
Noncontrolling interest	0	0
Total equity	(9,087,596)	(6,713,763)
Total Liabilities and Equity	(9,087,596)	(6,713,763)
Parent
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	933	2,522	0	146,806
Receivables, net	77,046	79,041
Inventories	120,937	120,042
Current assets - other	1,142	52,576
Total current assets	200,058	254,181
Property, plant and equipment	52,532	49,031
Goodwill	25,274	25,275
Investment in subsidiaries	6,517,205	5,388,613
Other intangibles, net	30,575	31,897
Other noncurrent assets	17,414	9,592
Total Assets	6,843,058	5,758,589
Current liabilities	196,827	194,983
Inter-company	2,121,546	1,562,399
Long-term debt	1,661,771	1,761,933
Long-term liabilities - other	54,046	33,298
Total liabilities	4,034,190	3,552,613
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	2,808,868	2,205,976
Noncontrolling interest	0	0
Total equity	2,808,868	2,205,976
Total Liabilities and Equity	6,843,058	5,758,589
Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	4,802	9,496	13,157	13,297
Receivables, net	237,360	202,779
Inventories	137,972	128,076
Current assets - other	4,507	(17,844)
Total current assets	384,641	322,507
Property, plant and equipment	136,382	126,661
Goodwill	546,527	477,472
Investment in subsidiaries	2,570,391	1,325,150
Other intangibles, net	251,347	204,512
Other noncurrent assets	295	(1,914)
Total Assets	3,889,583	2,454,388
Current liabilities	217,176	196,956
Inter-company	(2,026,634)	(1,848,777)
Long-term debt	14	58
Long-term liabilities - other	67,824	74,977
Total liabilities	(1,741,620)	(1,576,786)
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	5,632,665	4,032,250
Noncontrolling interest	(1,462)	(1,076)
Total equity	5,631,203	4,031,174
Total Liabilities and Equity	3,889,583	2,454,388
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	227,666	386,466	$ 213,034	$ 265,746
Receivables, net	852,381	660,688
Inventories	483,725	410,392
Current assets - other	116,642	833,397
Total current assets	1,680,414	2,290,943
Property, plant and equipment	385,058	342,684
Goodwill	1,888,302	1,576,018
Investment in subsidiaries	0	0
Other intangibles, net	922,510	817,451
Other noncurrent assets	58,651	54,708
Total Assets	4,934,935	5,081,804
Current liabilities	1,159,327	1,054,700
Inter-company	(94,912)	286,378
Long-term debt	161,518	976
Long-term liabilities - other	232,945	286,312
Total liabilities	1,458,878	1,628,366
Total Westinghouse Air Brake Technologies Corporation shareholders' equity	3,454,931	2,681,514
Noncontrolling interest	21,126	771,924
Total equity	3,476,057	3,453,438
Total Liabilities and Equity	$ 4,934,935	$ 5,081,804

X

- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details Name: us-gaap_Assets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details Name: us-gaap_AssetsCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_CondensedFinancialStatementsCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_IntangibleAssetsNetExcludingGoodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details Name: us-gaap_InventoryNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_Liabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(23)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(25)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(32)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LiabilitiesAndStockholdersEquity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.21) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LiabilitiesCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities. + References No definition available. + Details Name: us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebtAndCapitalLeaseObligations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_MinorityInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of other miscellaneous assets expected to be realized or consumed within one year or operating cycle, if longer. + References No definition available. + Details Name: us-gaap_OtherAssetsMiscellaneousCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_OtherAssetsNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details Name: us-gaap_PropertyPlantAndEquipmentNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details Name: us-gaap_ReceivablesNetCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_StockholdersEquity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details Name: us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Intercompany Loans + References No definition available. + Details Name: wab_IntercompanyLoans Namespace Prefix: wab_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_GuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_NonGuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 759,982	$ 675,574	$ 723,601	$ 772,031	$ 3,881,756	$ 2,931,188	$ 3,307,998
Cost of sales									(2,816,443)	(2,006,949)	(2,260,182)
Gross profit	268,440	253,203	273,963	269,707	219,189	212,481	237,389	255,180	1,065,313	924,239	1,047,816
Total operating expenses									(643,580)	(465,878)	(440,249)
Income from operations	91,163	102,011	113,701	114,858	62,800	120,096	133,284	142,181	421,733	458,361	607,567
Interest expense, net									(68,704)	(42,561)	(16,888)
Other (expense) income, net									(966)	(2,963)	(5,311)
Equity earnings (loss)									0	0	0
Income from operations before income taxes									352,063	412,837	585,368
Income tax expense									(89,773)	(99,433)	(186,740)
Net income									262,290	313,404	398,628
Less: Net income attributable to noncontrolling interest									(29)	(8,517)	0
Net income attributable to Wabtec shareholders	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 46,328	$ 82,428	$ 90,485	$ 94,163	262,261	304,887	398,628
Comprehensive income attributable to Wabtec shareholders									596,874	202,001	281,395
Elimination
Condensed Financial Statements, Captions [Line Items]
Net sales									(142,412)	(145,559)	(172,776)
Cost of sales									108,384	103,421	90,989
Gross profit									(34,028)	(42,138)	(81,787)
Total operating expenses									0	0	0
Income from operations									(34,028)	(42,138)	(81,787)
Interest expense, net									0	0	0
Other (expense) income, net									0	0	0
Equity earnings (loss)									(547,688)	(453,884)	(619,189)
Income from operations before income taxes									(581,716)	(496,022)	(700,976)
Income tax expense									0	0	0
Net income									(581,716)	(496,022)	(700,976)
Less: Net income attributable to noncontrolling interest									0	0	0
Net income attributable to Wabtec shareholders									(581,716)	(496,022)	(700,976)
Comprehensive income attributable to Wabtec shareholders									(581,716)	(496,022)	(700,976)
Parent
Condensed Financial Statements, Captions [Line Items]
Net sales									577,397	641,809	743,262
Cost of sales									(440,911)	(473,700)	(531,269)
Gross profit									136,486	168,109	211,993
Total operating expenses									(113,872)	(141,940)	(142,953)
Income from operations									22,614	26,169	69,040
Interest expense, net									(72,233)	(34,975)	(23,129)
Other (expense) income, net									5,103	20,509	23,193
Equity earnings (loss)									416,068	322,650	506,903
Income from operations before income taxes									371,552	334,353	576,007
Income tax expense									(109,294)	(29,466)	(177,379)
Net income									262,258	304,887	398,628
Less: Net income attributable to noncontrolling interest									0	0	0
Net income attributable to Wabtec shareholders									262,258	304,887	398,628
Comprehensive income attributable to Wabtec shareholders									263,907	305,180	409,734
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net sales									1,067,954	1,112,001	1,436,935
Cost of sales									(675,546)	(708,062)	(843,104)
Gross profit									392,408	403,939	593,831
Total operating expenses									(123,423)	(122,617)	(131,251)
Income from operations									268,985	281,322	462,580
Interest expense, net									8,843	7,012	5,914
Other (expense) income, net									289	(2,284)	(9,140)
Equity earnings (loss)									131,620	131,234	112,286
Income from operations before income taxes									409,737	417,284	571,640
Income tax expense									32,393	(57,667)	8,989
Net income									442,130	359,617	580,629
Less: Net income attributable to noncontrolling interest									386	0	0
Net income attributable to Wabtec shareholders									442,516	359,617	580,629
Comprehensive income attributable to Wabtec shareholders									442,516	359,617	580,629
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net sales									2,378,817	1,322,937	1,300,577
Cost of sales									(1,808,370)	(928,608)	(976,798)
Gross profit									570,447	394,329	323,779
Total operating expenses									(406,285)	(201,321)	(166,045)
Income from operations									164,162	193,008	157,734
Interest expense, net									(5,314)	(14,598)	327
Other (expense) income, net									(6,358)	(21,188)	(19,364)
Equity earnings (loss)									0	0	0
Income from operations before income taxes									152,490	157,222	138,697
Income tax expense									(12,872)	(12,300)	(18,350)
Net income									139,618	144,922	120,347
Less: Net income attributable to noncontrolling interest									(415)	(8,517)	0
Net income attributable to Wabtec shareholders									139,203	136,405	120,347
Comprehensive income attributable to Wabtec shareholders									$ 472,167	$ 33,226	$ (7,992)

X

- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details Name: us-gaap_ComprehensiveIncomeNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_CondensedFinancialStatementsCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_CostOfGoodsAndServicesSold Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_GrossProfit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details Name: us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount after tax of income (loss) of subsidiary attributable to the parent entity. + References No definition available. + Details Name: us-gaap_IncomeLossFromSubsidiariesNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details Name: us-gaap_IncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_InterestIncomeExpenseNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_NetIncomeLossAttributableToNoncontrollingInterest Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NonoperatingIncomeExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details Name: us-gaap_OperatingExpenses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details Name: us-gaap_OperatingIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details Name: us-gaap_ProfitLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_GuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_NonGuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 188,811	$ 450,530	$ 450,844
Net cash used in investing activities	(275,729)	(775,065)	(380,136)
Net cash provided by (used in) financing activities	(97,431)	522,971	(251,498)
Effect of changes in currency exchange rates	19,266	(26,143)	(18,868)
(Decrease) increase in cash	(165,083)	172,293	(199,658)
Cash, beginning of year	398,484	226,191	425,849
Cash, end of year	233,401	398,484	226,191
Elimination
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(34,028)	(42,138)	(81,787)
Net cash used in investing activities	0	0	0
Net cash provided by (used in) financing activities	34,028	42,138	81,787
Effect of changes in currency exchange rates	0	0	0
(Decrease) increase in cash	0	0	0
Cash, beginning of year	0	0	0
Cash, end of year	0	0	0
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(49,231)	(44,611)	(90,374)
Net cash used in investing activities	(11,156)	(829,783)	(7,862)
Net cash provided by (used in) financing activities	58,798	876,916	(48,570)
Effect of changes in currency exchange rates	0	0	0
(Decrease) increase in cash	(1,589)	2,522	(146,806)
Cash, beginning of year	2,522	0	146,806
Cash, end of year	933	2,522	0
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	249,204	332,822	487,516
Net cash used in investing activities	(120,661)	(14,725)	(109,326)
Net cash provided by (used in) financing activities	(133,237)	(321,758)	(378,330)
Effect of changes in currency exchange rates	0	0	0
(Decrease) increase in cash	(4,694)	(3,661)	(140)
Cash, beginning of year	9,496	13,157	13,297
Cash, end of year	4,802	9,496	13,157
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	22,866	204,457	135,489
Net cash used in investing activities	(143,912)	69,443	(262,948)
Net cash provided by (used in) financing activities	(57,020)	(74,325)	93,615
Effect of changes in currency exchange rates	19,266	(26,143)	(18,868)
(Decrease) increase in cash	(158,800)	173,432	(52,712)
Cash, beginning of year	386,466	213,034	265,746
Cash, end of year	$ 227,666	$ 386,466	$ 213,034

X

- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details Name: us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_CondensedFinancialStatementsCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details Name: us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details Name: us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details Name: us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details Name: us-gaap_NetCashProvidedByUsedInOperatingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_ConsolidationItemsAxis=us-gaap_ConsolidationEliminationsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_GuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ConsolidatedEntitiesAxis=us-gaap_NonGuarantorSubsidiariesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

OTHER (EXPENSE) INCOME, NET - Components of Other (Expense) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Foreign currency loss	$ (6,618)	$ (4,001)	$ (4,659)
Equity income	2,579	409	0
Other miscellaneous income (expense)	3,073	629	(652)
Total other (expense) income, net	$ (966)	$ (2,963)	$ (5,311)

X

- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details Name: us-gaap_ForeignCurrencyTransactionGainLossRealized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_IncomeLossFromEquityMethodInvestments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NonoperatingIncomeExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_OtherIncomeAndExpensesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_OtherNonoperatingIncomeExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.8.0.1

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) - Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Accounting Estimate [Line Items]
Net sales	$ 1,075,538	$ 957,931	$ 932,253	$ 916,034	$ 759,982	$ 675,574	$ 723,601	$ 772,031	$ 3,881,756	$ 2,931,188	$ 3,307,998
Gross profit	268,440	253,203	273,963	269,707	219,189	212,481	237,389	255,180	1,065,313	924,239	1,047,816
Income from operations	91,163	102,011	113,701	114,858	62,800	120,096	133,284	142,181	421,733	458,361	607,567
Net income attributable to Wabtec shareholders	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 46,328	$ 82,428	$ 90,485	$ 94,163	$ 262,261	$ 304,887	$ 398,628
Basic earnings from operations per common share (in dollars per share)	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 0.42	$ 0.92	$ 1.00	$ 1.03	$ 2.74	$ 3.37	$ 4.14
Diluted earnings from operations per common share (in dollars per share)	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 0.42	$ 0.91	$ 1.00	$ 1.02	$ 2.72	$ 3.34	$ 4.10
Restatement Adjustment
Change in Accounting Estimate [Line Items]
Income from operations	$ (14,800)

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ChangeInAccountingEstimateLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareBasic Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details Name: us-gaap_EarningsPerShareDiluted Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_GrossProfit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_NetIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details Name: us-gaap_OperatingIncomeLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details Name: us-gaap_SalesRevenueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Details Name: us-gaap_StatementScenarioAxis=us-gaap_RestatementAdjustmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.8.0.1

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Warranty and overhaul reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 138,992	$ 92,064	$ 87,849
Charged/ (credited) to expense	50,385	28,947	35,418
Charged/(credited) to other accounts	12,234	56,753	(1,762)
Deductions from reserves	48,548	38,772	29,441
Balance at end of period	153,063	138,992	92,064
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	7,340	5,614	6,270
Charged/ (credited) to expense	2,632	3,635	2,026
Charged/(credited) to other accounts	4,979	0	0
Deductions from reserves	2,609	1,909	2,682
Balance at end of period	12,342	7,340	5,614
Valuation allowance-taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	21,418	12,623	1,818
Charged/ (credited) to expense	6,760	3,405	7,024
Charged/(credited) to other accounts	0	5,390	3,781
Deductions from reserves	10,024	0	0
Balance at end of period	$ 18,154	$ 21,418	$ 12,623

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_MovementInValuationAllowancesAndReservesRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details Name: us-gaap_ValuationAllowancesAndReservesBalance Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details Name: us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details Name: us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details Name: us-gaap_ValuationAllowancesAndReservesDeductions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_ValuationAllowancesAndReservesTypeAxis=wab_WarrantyAndOverhaulReservesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForDoubtfulAccountsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_ValuationAllowanceTaxCreditCarryforwardMember Namespace Prefix: Data Type: na Balance Type: Period Type: