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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 10-Q

☒    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024

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: 0-25837

HEIDRICK & STRUGGLES INTERNATIONAL, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware						36-2681268
(State or Other Jurisdiction of Incorporation or Organization)						(I.R.S. Employer Identification Number)

233 South Wacker Drive-Suite 4900

Chicago, Illinois

60606-6303

(Address of Principal Executive Offices)

(312) 496-1200

(Registrant’s Telephone Number, Including Area Code)

Securities Registered Pursuant to Section 12(b) of the Act:

Title of Each Class			Trading Symbol			Name of Each Exchange on Which Registered
Common Stock, $0.01 par value			HSII			The Nasdaq Stock Market LLC

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  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x    No  ¨

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

Large accelerated filer

¨

Accelerated filer

☒

Non-Accelerated filer

¨

Smaller reporting company

☐

Emerging growth 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. o

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

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

As of July 26, 2024, there were 20,317,376 shares of the Company’s common stock outstanding.

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

INDEX

 

						PAGE
PART I.			FINANCIAL INFORMATION
Item 1.			Condensed Consolidated Financial Statements
			Condensed Consolidated Balance Sheets as of June 30, 2024 (Unaudited) and December 31, 2023			1
			Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024 and 2023			2
			Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity for the three and six months ended June 30, 2024 and 2023			3
			Unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024 and 2023			5
			Unaudited Notes to Condensed Consolidated Financial Statements			6
Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations			23
Item 3.			Quantitative and Qualitative Disclosures about Market Risk			40
Item 4.			Controls and Procedures			40
PART II.			OTHER INFORMATION
Item 1.			Legal Proceedings			41
Item 1A.			Risk Factors			41
Item 2.			Unregistered Sales of Equity Securities and Use of Proceeds			35
Item 6.			Exhibits			43
			SIGNATURE			44

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PART I. FINANCIAL INFORMATION

ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

 

HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share amounts)

						June 30, 2024						December 31, 2023
						(Unaudited)
Current assets
Cash and cash equivalents						$	189,922					$	412,618
Marketable securities						106,963						65,538
Accounts receivable, net of allowances of $7,943 and $6,954, respectively						187,113						133,128
Prepaid expenses						28,016						23,597
Other current assets						43,745						47,923
Income taxes recoverable						7,660						10,410
Total current assets						563,419						693,214
Non-current assets
Property and equipment, net						48,434						35,752
Operating lease right-of-use assets						82,114						86,063
Assets designated for retirement and pension plans						10,779						11,105
Investments						55,927						47,287
Other non-current assets						26,875						17,071
Goodwill						183,150						202,252
Other intangible assets, net						16,411						20,842
Deferred income taxes						29,216						28,005
Total non-current assets						452,906						448,377
Total assets						$	1,016,325					$	1,141,591
Current liabilities
Accounts payable						$	19,515					$	20,837
Accrued salaries and benefits						190,225						322,744
Deferred revenue						44,679						45,732
Operating lease liabilities						18,044						21,498
Other current liabilities						25,693						21,823
Income taxes payable						8,593						6,057
Total current liabilities						306,749						438,691
Non-current liabilities
Accrued salaries and benefits						51,404						52,108
Retirement and pension plans						70,855						62,100
Operating lease liabilities						78,120						78,204
Other non-current liabilities						42,562						41,808
Deferred income taxes						5,703						6,402
Total non-current liabilities						248,644						240,622
Total liabilities						555,393						679,313
Commitments and contingencies (Note 18)
Stockholders’ equity
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued at June 30, 2024 and December 31, 2023						—						—
Common stock, $0.01 par value, 100,000,000 shares authorized, 20,322,456 and 20,127,872 shares issued, 20,317,376 and 20,122,792 shares outstanding at June 30, 2024 and December 31, 2023, respectively						203						201
Treasury stock at cost, 5,080 shares at June 30, 2024 and December 31, 2023						(110)						(110)
Additional paid in capital						254,348						251,988
Retained earnings						212,547						210,070
Accumulated other comprehensive income (loss)						(6,056)						129
Total stockholders’ equity						460,932						462,278
Total liabilities and stockholders’ equity						$	1,016,325					$	1,141,591

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands, except per share amounts)

(Unaudited)

 

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Revenue
Revenue before reimbursements (net revenue)						$	278,626					$	271,225					$	543,823					$	510,542
Reimbursements						4,251						2,552						8,152						5,354
Total revenue						282,877						273,777						551,975						515,896
Operating expenses
Salaries and benefits						177,892						178,916						352,305						337,775
General and administrative expenses						46,453						40,514						87,816						74,841
Cost of services						29,696						25,306						57,128						48,138
Research and development						5,605						5,658						11,320						11,186
Impairment charges						16,224						7,246						16,224						7,246
Restructuring charges						6,939						—						6,939						—
Reimbursed expenses						4,251						2,552						8,152						5,354
Total operating expenses						287,060						260,192						539,884						484,540
Operating income (loss)						(4,183)						13,585						12,091						31,356
Non-operating income
Interest, net						2,612						1,913						6,698						5,162
Other, net						997						1,377						3,568						3,186
Net non-operating income						3,609						3,290						10,266						8,348
Income (loss) before income taxes						(574)						16,875						22,357						39,704
Provision for income taxes						4,583						7,893						13,482						15,136
Net income (loss)						(5,157)						8,982						8,875						24,568
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment						(2,103)						(88)						(6,161)						314
Net unrealized gain (loss) on available-for-sale investments						9						13						(24)						54
Other comprehensive income (loss), net of tax						(2,094)						(75)						(6,185)						368
Comprehensive income (loss)						$	(7,251)					$	8,907					$	2,690					$	24,936
Weighted-average common shares outstanding
Basic						20,259						20,010						20,202						19,958
Diluted						20,259						20,637						21,061						20,701
Earnings (loss) per common share
Basic						$	(0.25)					$	0.45					$	0.44					$	1.23
Diluted						$	(0.25)					$	0.44					$	0.42					$	1.19
Cash dividends paid per share						$	0.15					$	0.15					$	0.30					$	0.30

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(In thousands, except per share amounts)

(Unaudited)

																											Additional Paid in Capital						Retained Earnings						Accumulated Other Comprehensive Income (Loss)						Total
			Common Stock												Treasury Stock
			Shares						Amount						Shares						Amount
Balance at December 31, 2023			20,127						$	201					5						$	(110)					$	251,988					$	210,070					$	129					$	462,278
Net income			—						—						—						—						—						14,032						—						14,032
Other comprehensive loss, net of tax			—						—						—						—						—						—						(4,091)						(4,091)
Common and treasury stock transactions:
Stock-based compensation															—						—						2,644						—						—						2,644
Vesting of equity awards, net of tax withholding			127						1						—						—						(2,863)						—						—						(2,862)
Cash dividends declared ($0.15 per share)			—						—						—						—						—						(3,018)						—						(3,018)
Dividend equivalents on restricted stock units			—						—						—						—						—						(198)						—						(198)
Balance at March 31, 2024			20,254						$	202					5						$	(110)					$	251,769					$	220,886					$	(3,962)					$	468,785
Net income			—						—						—						—						—						(5,157)						—						(5,157)
Other comprehensive loss, net of tax			—						—						—						—						—						—						(2,094)						(2,094)
Common and treasury stock transactions:
Stock-based compensation			—						—						—						—						3,465						—						—						3,465
Issuance of common stock			13						—						—						—						—						—						—						—
Vesting of equity awards, net of tax withholding			55						1						—						—						(886)						—						—						(885)
Cash dividends declared ($0.15 per share)			—						—						—						—						—						(3,039)						—						(3,039)
Dividend equivalents on restricted stock units			—						—						—						—						—						(143)						—						(143)
Balance at June 30, 2024			20,322						203						5						(110)						254,348						212,547						(6,056)						460,932

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(In thousands, except per share amounts)

(Unaudited)

																											Additional Paid in Capital						Retained Earnings						Accumulated Other Comprehensive Income (Loss)						Total
			Common Stock												Treasury Stock
			Shares						Amount						Shares						Amount
Balance at December 31, 2022			19,866						$	199					5						$	(191)					$	246,630					$	168,197					$	(4,189)					$	410,646
Net income			—						—						—						—						—						15,586						—						15,586
Other comprehensive income, net of tax			—						—						—						—						—						—						443						443
Common and treasury stock transactions:
Stock-based compensation			—						—						—						—						1,853						—						—						1,853
Vesting of equity awards, net of tax withholding			172						1						—						—						(4,142)						—						—						(4,141)
Clawback of equity awards			—						—						5						(163)						—						—						—						(163)
Cash dividends declared ($0.15 per share)			—						—						—						—						—						(3,006)						—						(3,006)
Dividend equivalents on restricted stock units			—						—						—						—						—						(106)						—						(106)
Balance at March 31, 2023			20,038						$	200					10						$	(354)					$	244,341					$	180,671					$	(3,746)					$	421,112
Net income			—						—						—						—						—						8,982						—						8,982
Other comprehensive loss, net of tax			—						—						—						—						—						—						(75)						(75)
Common and treasury stock transactions:
Stock-based compensation			—						—						—						—						1,919						—						—						1,919
Repurchase of common stock			—						—						36						(904)						—						—						—						(904)
Re-issuance of treasury stock			—						—						(16)						439						(34)						—						—						405
Cash dividends declared ($0.15 per share)			—						—						—						—						—						(3,003)						—						(3,003)
Dividend equivalents on restricted stock units			—						—						—						—						—						(119)						—						(119)
Balance at June 30, 2023			20,038						$	200					30						$	(819)					$	246,226					$	186,531					$	(3,821)					$	428,317

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

 

						Six Months Ended June 30,
						2024						2023
Cash flows - operating activities
Net income						$	8,875					$	24,568
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization						8,700						8,692
Deferred income taxes						(2,333)						6,446
Stock-based compensation expense						6,109						3,772
Accretion expense related to earnout payments						935						642
Gain on marketable securities						(980)						(1,694)
Loss on disposal of property and equipment						261						131
Impairment charges						16,224						7,246
Changes in assets and liabilities:
Accounts receivable						(55,842)						(59,990)
Accounts payable						(2,324)						(2,914)
Accrued expenses						(124,747)						(273,811)
Restructuring accrual						4,386						—
Deferred revenue						(673)						543
Income taxes recoverable and payable, net						5,368						(2,588)
Retirement and pension plan assets and liabilities						5,800						6,403
Prepaid expenses						(4,652)						(2,635)
Other assets and liabilities, net						(6,009)						(4,902)
Net cash used in operating activities						(140,902)						(290,091)
Cash flows - investing activities
Acquisition of businesses, net of cash acquired						—						(35,749)
Capital expenditures						(16,538)						(6,814)
Purchases of marketable securities and investments						(115,262)						(27,683)
Proceeds from sales of marketable securities and investments						66,574						268,118
Net cash provided by (used in) investing activities						(65,226)						197,872
Cash flows - financing activities
Repurchases of common stock						—						(904)
Cash dividends paid						(6,398)						(6,234)
Payment of employee tax withholdings on equity transactions						(3,747)						(4,141)
Acquisition earnout payments						—						(35,946)
Net cash used in financing activities						(10,145)						(47,225)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash						(6,423)						1,772
Net decrease in cash, cash equivalents and restricted cash						(222,696)						(137,672)
Cash, cash equivalents and restricted cash at beginning of period						412,618						355,489
Cash, cash equivalents and restricted cash at end of period						$	189,922					$	217,817

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

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HEIDRICK & STRUGGLES INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(All tables in thousands, except per share figures and percentages)

(Unaudited) 

1.    Basis of Presentation of Interim Financial Information

The accompanying unaudited Condensed Consolidated Financial Statements of Heidrick & Struggles International, Inc. and subsidiaries (the "Company") have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. Significant items subject to estimates and assumptions include revenue recognition, income taxes, interim effective tax rate and the assessment of goodwill, other intangible assets and long-lived assets for impairment. Estimates are subject to a degree of uncertainty and actual results could differ from these estimates. In the opinion of management, all adjustments necessary to fairly present the financial position of the Company at June 30, 2024 and December 31, 2023, the results of operations for the three and six months ended June 30, 2024 and 2023 and its cash flows for the six months ended June 30, 2024 and 2023 have been included and are of a normal, recurring nature except as otherwise disclosed. These financial statements and notes are to be read in conjunction with the Company’s Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024.

2.    Summary of Significant Accounting Policies

A complete listing of the Company’s significant accounting policies is discussed in Note 2, Summary of Significant Accounting Policies, in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Revenue Recognition

See Note 3, Revenue.

Cost of Services

Cost of services consists of third-party contractor costs related to the delivery of various services in the Company's On-Demand Talent and Heidrick Consulting operating segments.

Research and Development

Research and development expense consists of payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development.

Marketable Securities

The Company’s marketable securities consist of available-for-sale debt securities with original maturities exceeding three months.

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Restricted Cash

The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Cash Flows as of June 30, 2024, and 2023, and December 31, 2023, and 2022:

			June 30,												December 31,
			2024						2023						2023						2022
Cash and cash equivalents			$	189,922					$	217,776					$	412,618					$	355,447
Restricted cash included within other non-current assets			—						41						—						42
Total cash, cash equivalents and restricted cash			$	189,922					$	217,817					$	412,618					$	355,489

Earnings (Loss) per Common Share

Basic earnings (loss) per common share are computed by dividing net income (loss) by weighted average common shares outstanding for the period. Diluted earnings (loss) per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted. Common equivalent shares are excluded from the determination of diluted earnings (loss) per share in periods in which they have an anti-dilutive effect.

The following table sets forth the computation of basic and diluted earnings (loss) per share:

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Net income (loss)						$	(5,157)					$	8,982					$	8,875					$	24,568
Weighted average shares outstanding:
Basic						20,259						20,010						20,202						19,958
Effect of dilutive securities:
Restricted stock units						—						516						615						584
Performance stock units						—						111						244						159
Diluted						20,259						20,637						21,061						20,701
Basic earnings (loss) per share						$	(0.25)					$	0.45					$	0.44					$	1.23
Diluted earnings (loss) per share						$	(0.25)					$	0.44					$	0.42					$	1.19

Weighted average restricted stock units and performance stock units outstanding that could be converted into approximately 474,000 and 132,000 common shares, respectively, for the three months ended June 30, 2024, were not included in the computation of diluted earnings (loss) per share because the effects would be anti-dilutive.

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets, Current liabilities - Operating lease liabilities and Non-current liabilities - Operating lease liabilities in the Company's Condensed Consolidated Balance Sheets. The Company does not have any leases that meet the finance lease criteria.

Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized on the commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, an incremental borrowing rate based on the information available at the commencement date is used in determining the present value of lease payments. The operating lease right-of-use asset also includes any lease payments made in advance and any accrued rent expense balances. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

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The Company has lease agreements with lease and non-lease components. For office leases, the Company accounts for the lease and non-lease components as a single lease component. For equipment leases, such as vehicles and office equipment, the Company accounts for the lease and non-lease components separately.

Goodwill

Goodwill represents the difference between the purchase price of acquired businesses and the related fair value of the net assets acquired, which is accounted for by the acquisition method of accounting. The Company performs assessments of the carrying value of its goodwill at least annually and whenever events occur or circumstances indicate that a carrying amount of goodwill may not be recoverable. These circumstances include a significant change in business climate, attrition of key personnel, changes in financial condition or results of operations, prolonged decline in the Company’s stock price and market capitalization, competition, and other factors.

The goodwill impairment test compares the fair value of a reporting unit to its carrying amount, including goodwill. The Company operates five reporting units: Americas, Europe (which includes Africa), Asia Pacific (which includes the Middle East), On-Demand Talent and Heidrick Consulting. The fair value of each of the Company’s reporting units is determined using a discounted cash flow methodology. An impairment charge is recognized for the amount by which the carrying value of the reporting unit exceeds its fair value; however, the loss recognized is not to exceed the total amount of goodwill allocated to that reporting unit.

As a result of triggering events, the Company performed interim goodwill impairment evaluations during the three months ended June 30, 2024, and 2023, when the Company determined that it was more likely than not that the fair value of at least one of its reporting units was less than its respective carrying amount.

Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions to evaluate the impact of operating and macroeconomic changes on each reporting unit. During the impairment evaluation process, the Company used a discounted cash flow methodology to estimate the fair value of each of its reporting units. The discounted cash flow approach is dependent on a number of factors, including estimates of future market growth and trends, forecasted revenue and costs, capital investments, appropriate discount rates, certain assumptions to allocate shared costs, assets and liabilities, historical and projected performance of the reporting unit, and the macroeconomic conditions affecting each of the Company’s reporting units. The assumptions used in the determination of fair value were (1) a forecast of growth in the near and long term; (2) the discount rate; (3) working capital investments; (4) macroeconomic conditions; and (5) other factors. As part of the goodwill impairment evaluation, the Company performed a reconciliation of its market capitalization to the aggregated estimated fair value of all reporting units, including consideration of a control premium.

Based on the results of the 2024 impairment evaluation, the Company determined that the goodwill within the On-Demand Talent and Europe reporting units were impaired, which resulted in impairment charges of $14.8 million and $1.5 million, respectively. Based on the results of the 2023 impairment evaluation, the Company determined that the goodwill within the Heidrick Consulting reporting unit was impaired, which resulted in an impairment charge of $7.2 million. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024, and 2023 and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023. The impairments were non-cash in nature and did not affect the Company's current liquidity, cash flows, borrowing capability or operations; nor did they impact the debt covenants under the Company's credit agreement.

Recently Issued Financial Accounting Standards

In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." The standard is intended to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance on its financial statements.

In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard is intended to improve reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit (referred to as the “significant expense principle”). This guidance is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company is currently evaluating the impact of this guidance on its financial statements.

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In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The guidance was intended to provide temporary optional expedients and exceptions to the guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates. This guidance is effective March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2024. The new guidance is not expected to have a material effect on the Company's financial statements.

3.    Revenue

Executive Search

Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Generally, each executive search contract contains one performance obligation which is the process of identifying potentially qualified candidates for a specific client position. In most contracts, the transaction price includes both fixed and variable consideration. Fixed compensation is comprised of a retainer, equal to approximately one-third of the estimated first year compensation for the position to be filled, and indirect expenses, equal to a specified percentage of the retainer, as defined in the contract. The Company generally bills clients for the retainer and indirect expenses in one-third increments over a three-month period commencing in the month of a client’s acceptance of the contract. If actual compensation of a placed candidate exceeds the original compensation estimate, the Company is often authorized to bill the client for one-third of the excess compensation. The Company refers to this additional billing as uptick revenue. In most contracts, variable consideration is comprised of uptick revenue and direct expenses. The Company bills its clients for uptick revenue upon completion of the executive search, and direct expenses are billed as incurred.

The Company estimates uptick revenue at contract inception, based on a portfolio approach, utilizing the expected value method based on a historical analysis of uptick revenue realized in the Company’s geographic regions and industry practices, and initially records a contract’s uptick revenue in an amount that is probable not to result in a significant reversal of cumulative revenue recognized when the actual amount of uptick revenue for the contract is known. Differences between the estimated and actual amounts of variable consideration are recorded when known. The Company does not estimate revenue for direct expenses as it is not materially different than recognizing revenue as direct expenses are incurred.

Revenue from executive search engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance.  Revenue from executive search engagements is recognized over the expected average period of performance, in proportion to the estimated personnel time incurred to fulfill the obligations under the executive search contract. Revenue is generally recognized over a period of approximately six months.

The Company's executive search contracts contain a replacement guarantee which provides for an additional search to be completed, free of charge except for expense reimbursements, should the candidate presented by the Company be hired by the client and subsequently terminated by the client for performance reasons within a specified period of time. The replacement guarantee is an assurance warranty, which is not a performance obligation under the terms of the executive search contract, as the Company does not provide any services under the terms of the guarantee that transfer benefits to the client in excess of assuring that the identified candidate complies with the agreed-upon specifications. The Company accounts for the replacement guarantee under the relevant warranty guidance in Accounting Standards Codification 460 - Guarantees.

On-Demand Talent

The Company enters into contracts with clients that outline the general terms and conditions of the assignment to provide on-demand consultants for various types of consulting projects, which consultants may be independent contractors or temporary employees. The consideration the Company expects to receive under each contract is dependent on the time-based fees specified in the contract. Revenue from on-demand engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. The Company has applied the practical expedient to recognize revenue for these services in the amount to which the Company has a right to invoice the client, as this amount corresponds directly with the value provided to the client for the performance completed to date. For transactions where a third-party contractor is involved in providing the services to the client, the Company reports the revenue and the related direct costs on a gross basis as it has determined that it is the principal in the transaction. The Company is primarily responsible for fulfilling the promise to provide consulting services to its clients and the Company has discretion in establishing

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the prices charged to clients for the consulting services and is able to contractually obligate the independent service provider to deliver services and deliverables that the Company has agreed to provide to its clients.

Heidrick Consulting

Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Heidrick Consulting enters into contracts with clients that outline the general terms and conditions of the assignment to provide succession planning, executive assessment, top team and board effectiveness and culture shaping programs. The consideration the Company expects to receive under each contract is generally fixed. Most of the Company's consulting contracts contain one performance obligation, which is the overall process of providing the consulting service requested by the client. The majority of the Company's consulting revenue is recognized over time utilizing input methods. Revenue recognition over time for the majority of the Company's consulting engagements is measured by total cost or time incurred as a percentage of the total estimated cost or time on the consulting engagement.

Contract Balances

Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets and liabilities are classified as current due to the nature of the Company's contracts, which are completed within one year. Contract assets are included within Other current assets on the Condensed Consolidated Balance Sheets.

Unbilled receivables: Unbilled receivables represents contract assets from revenue recognized over time in excess of the amount billed to the client and the amount billed to the client is solely dependent upon the passage of time. This amount includes revenue recognized in excess of billed Executive Search retainers, Heidrick Consulting fees, and On-Demand Talent fees.

Contract assets: Contract assets represent revenue recognized over time in excess of the amount billed to the client, and the amount billed to the client is not solely subject to the passage of time. This amount primarily includes revenue recognized for upticks and contingent placement fees in executive search contracts.

Deferred revenue: Contract liabilities consist of deferred revenue, which is equal to billings in excess of revenue recognized.

The following table outlines the changes in the contract asset and liability balances from December 31, 2023, to June 30, 2024:

			June 30, 2024						December 31, 2023						Change
Contract assets
Unbilled receivables, net			$	19,878					$	15,318					$	4,560
Contract assets			16,112						16,774						(662)
Total contract assets			35,990						32,092						3,898
Contract liabilities
Deferred revenue			$	44,679					$	45,732					$	(1,053)

During the six months ended June 30, 2024, the Company recognized revenue of $36.2 million that was included in the contract liabilities balance at the beginning of the period. The amount of revenue recognized during the six months ended June 30, 2024, from performance obligations partially satisfied in previous periods as a result of changes in the estimates of variable consideration was $19.1 million.

Each of the Company's contracts has an expected duration of one year or less. Accordingly, the Company has elected to utilize the available practical expedient related to the disclosure of the transaction price allocated to the remaining performance obligations under its contracts. The Company has also elected the available practical expedients related to adjusting for the effects of a significant financing component and the capitalization of contract acquisition costs. The Company charges and collects from its clients sales tax and value added taxes as required by certain jurisdictions. The Company has made an accounting policy election to exclude these items from the transaction price in its contracts.

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4.    Credit Losses

The Company is exposed to credit losses primarily through the provision of its executive search, consulting, and on-demand talent services. The Company’s expected credit loss allowance methodology for accounts receivable is developed using historical collection experience, current and future economic and market conditions and a review of the current status of clients' trade accounts receivables. Due to the short-term nature of such receivables, the estimate of the amount of accounts receivable that may not be collected is primarily based on historical loss-rate experience. When required, the Company adjusts the loss-rate methodology to account for current conditions and reasonable and supportable expectations of future economic and market conditions. The Company generally assesses future economic conditions for a period of sixty to ninety days, which corresponds with the contractual life of its accounts receivables. Additionally, specific allowance amounts are established to record the appropriate provision for clients that have a higher probability of default. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of clients' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible.

The activity in the allowance for credit losses on the Company's trade receivables is as follows:

Balance at December 31, 2023			$	6,954
Provision for credit losses			3,674
Write-offs			(3,051)
Foreign currency translation			366
Balance at June 30, 2024			$	7,943

There were no investments with unrealized losses at June 30, 2024, and December 31, 2023.

5.    Property and Equipment, net

The components of the Company’s property and equipment are as follows:

						June 30, 2024						December 31, 2023
Leasehold improvements						$	49,895					$	45,050
Office furniture, fixtures and equipment						15,132						14,775
Computer equipment and software						43,024						38,798
Property and equipment, gross						108,051						98,623
Accumulated depreciation						(59,617)						(62,871)
Property and equipment, net						$	48,434					$	35,752

Depreciation expense for the three months ended June 30, 2024, and 2023, was $2.0 million and $2.2 million, respectively. Depreciation expense for the six months ending June 30, 2024, and 2023, was $4.5 million and $4.2 million, respectively.

6.    Leases

The Company's lease portfolio is comprised of operating leases for office space and equipment. The majority of the Company's leases include both lease and non-lease components, which the Company accounts for differently depending on the underlying class of asset. Certain of the Company's leases include one or more options to renew or terminate the lease at the Company's discretion. Generally, the renewal and termination options are not included in the right-of-use assets and lease liabilities as they are not reasonably certain of exercise. The Company regularly evaluates the renewal and termination options and, when they are reasonably certain of exercise, includes the renewal or termination option in the lease term.

As most of the Company's leases do not provide an implicit interest rate, the Company utilizes an incremental borrowing rate based on the information available at the commencement date of the lease in determining the present value of lease payments. The Company has a centrally managed treasury function and, therefore, a portfolio approach is applied in determining the incremental borrowing rate. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a fully collateralized basis over a similar term in an amount equal to the total lease payments in a similar economic environment.

As of June 30, 2024, office leases have remaining lease terms that range from less than one year to 11.7 years, some of which also include options to extend or terminate the lease. Most office leases contain both fixed and variable lease payments. Variable lease costs consist primarily of rent escalations based on an established index or rate and taxes, insurance, and

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common area or other maintenance costs, which are paid based on actual costs incurred by the lessor. The Company has elected to utilize the available practical expedient to not separate lease and non-lease components for office leases.

As of June 30, 2024, equipment leases, which are comprised of vehicle and office equipment leases, have remaining terms that range from less than one year to 4.7 years, some of which also include options to extend or terminate the lease. The Company's equipment leases do not contain variable lease payments. The Company separates the lease and non-lease components for its equipment leases. Equipment leases do not comprise a significant portion of the Company's lease portfolio.

Lease cost components included within Operating expenses - General and administrative expenses in the Condensed Consolidated Statements of Comprehensive Income were as follows:

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Operating lease cost						$	6,719					$	4,567					$	12,356					$	9,092
Variable lease cost						2,570						$	3,071					5,025						4,987
Total lease cost						$	9,289					$	7,638					$	17,381					$	14,079

Supplemental cash flow information related to the Company's operating leases is as follows for the six months ended June 30:

						2024						2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases						$	11,807					$	10,082
Right-of-use assets obtained in exchange for lease obligations:
Operating leases						$	7,447					$	7,520

The weighted average remaining lease term and weighted average discount rate for operating leases as of June 30, are as follows:

						2024						2023
Weighted Average Remaining Lease Term
Operating leases						7.4 years						6.3 years
Weighted Average Discount Rate
Operating leases						5.01		%				3.79		%

The future maturities of the Company's operating lease liabilities as of June 30, 2024, for the years ended December 31, are as follows:

			Operating Lease Maturity
2024			$	11,098
2025			17,601
2026			16,018
2027			15,785
2028			12,296
Thereafter			47,313
Total lease payments			120,111
Less: Interest			23,947
Present value of lease liabilities			$	96,164

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7.    Financial Instruments and Fair Value

Cash, Cash Equivalents and Marketable Securities

The Company's investments in marketable debt securities, which consist of U.S. Treasury bills, are classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument's underlying contractual maturity date. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in Accumulated other comprehensive income (loss) in the Condensed Consolidated Balance Sheets until realized.

The Company's cash, cash equivalents, and marketable securities by significant investment category are as follows:

			Amortized Cost						Unrealized Gains												Fair Value						Cash and Cash Equivalents						Marketable Securities
Balance at June 30, 2024
Cash																											$	148,574					$	—
Level 1(1):
Money market funds																											18,686						—
U.S. Treasury securities			$	129,607					$	18											$	129,625					22,662						106,963
Total Level 1			129,607						18												129,625						41,348						106,963
Total			$	129,607					$	18											$	129,625					$	189,922					$	106,963

			Amortized Cost						Unrealized Gains												Fair Value						Cash and Cash Equivalents						Marketable Securities
Balance at December 31, 2023
Cash																											$	221,980					$	—
Level 1(1):
Money market funds																											13,906						—
U.S. Treasury securities			$	242,228					$	42											$	242,270					176,732						65,538
Total Level 1			242,228						42												242,270						190,638						65,538
Total			$	242,228					$	42											$	242,270					$	412,618					$	65,538

(1)Level 1 – Quoted prices in active markets for identical assets and liabilities.

Investments, Assets Designated for Retirement and Pension Plans and Associated Liabilities

The Company has a U.S. non-qualified deferred compensation plan that consists primarily of U.S. marketable securities and mutual funds. The aggregate cost basis for these investments was $42.8 million and $37.2 million as of June 30, 2024, and December 31, 2023, respectively.

The Company also maintains a pension plan for certain current and former employees in Germany. The pensions are individually fixed Euro amounts that vary depending on the function and the eligible years of service of the employee. The Company’s investment strategy is to support its pension obligations through reinsurance contracts. The BaFin—German Federal Financial Supervisory Authority—supervises the insurance companies and the reinsurance contracts. The BaFin requires each reinsurance contract to guarantee a fixed minimum return. The Company’s pension benefits are fully reinsured by group insurance contracts with ERGO Lebensversicherung AG, and the group insurance contracts are measured in accordance with BaFin guidelines (including mortality tables and discount rates) which are considered Level 2 inputs.

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The following tables provide a summary of the fair value measurements for each major category of investments, assets designated for retirement and pension plans and associated liabilities measured at fair value:

												Balance Sheet Classification
												Current Assets												Non-Current Assets												Current Liabilities						Non-current Liabilities
						Fair Value						Other Current Assets												Assets Designated for Retirement and Pension Plans						Investments						Other Current Liabilities						Retirement and Pension Plans
Balance at June 30, 2024
Measured on a recurring basis:
Level 1(1):
U.S. non-qualified deferred compensation plan						$	55,927					$	—											$	—					$	55,927					$	—					$	—
Level 2(2):
Retirement and pension plan assets						12,030						1,251												10,779						—						—						—
Pension benefit obligation						(13,993)						—												—						—						(1,251)						(12,742)
Total Level 2						(1,963)						1,251												10,779						—						(1,251)						(12,742)
Total						$	53,964					$	1,251											$	10,779					$	55,927					$	(1,251)					$	(12,742)

									Balance Sheet Classification
									Current Assets												Non-Current Assets												Current Liabilities						Non-current Liabilities
			Fair Value						Other Current Assets												Assets Designated for Retirement and Pension Plans						Investments						Other Current Liabilities						Retirement and Pension Plans
Balance at December 31, 2023
Measured on a recurring basis:
Level 1(1):
U.S. non-qualified deferred compensation plan			$	47,287					$	—											$	—					$	47,287					$	—					$	—
Level 2(2):
Retirement and pension plan assets			12,394						1,289												11,105						—						—						—
Pension benefit obligation			(14,416)						—												—						—						(1,289)						(13,127)
Total Level 2			(2,022)						1,289												11,105						—						(1,289)						(13,127)
Total			$	45,265					$	1,289											$	11,105					$	47,287					$	(1,289)					$	(13,127)

(1)Level 1 – Quoted prices in active markets for identical assets and liabilities.

(2)Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

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Contingent Consideration and Compensation

The former owners of certain of the Company's acquired businesses are eligible to receive additional cash consideration based on the attainment of certain operating metrics in the periods subsequent to acquisition. Contingent consideration and compensation are valued using significant inputs that are not observable in the market, which are defined as Level 3 inputs pursuant to fair value measurement accounting. The Company determines the fair value of contingent consideration and compensation using a variation of the income approach, known as the real options method. The significant unobservable inputs utilized in the real options method include (1) revenue forecasts; (2) operating expense forecasts; (3) the discount rate; and (4) volatility.

The following table provides a reconciliation of the beginning and ending balance of Level 3 liabilities for the six months ended June 30, 2024:

												Earnout						Contingent Compensation
Balance at December 31, 2023												$	(38,601)					$	(18,878)
Earnout accretion												(935)						—
Compensation expense												—						(5,273)
Fair value adjustment												(1,211)						—
Payments												—						4,821
Foreign currency translation												1,047						990
Balance at June 30, 2024												$	(39,700)					$	(18,340)

Earnout accruals of $39.7 million and $38.6 million were recorded within Non-current liabilities - Other non-current liabilities as of June 30, 2024, and December 31, 2023, respectively. Contingent compensation accruals of $4.0 million and $6.0 million are recorded within Current liabilities - Accrued salaries and benefits as of June 30, 2024, and December 31, 2023, respectively, and contingent compensation accruals of $14.4 million and $12.9 million are recorded within Non-current liabilities - Accrued salaries and benefits as of June 30, 2024, and December 31, 2023, respectively.

Goodwill

Goodwill represents the difference between the purchase price of acquired businesses and the related fair value of the net assets acquired, which is accounted for by the acquisition method of accounting. The Company performs assessments of the carrying value of goodwill at least annually and whenever events occur or circumstances indicate that a carrying amount of goodwill may not be recoverable. During the three months ended June 30, 2024, an interim goodwill impairment evaluation was conducted to determine the fair value of the Company's reporting units. As a result of this evaluation, the Company recorded impairment charges in the On-Demand Talent and Europe reporting units of $14.8 million and $1.5 million, respectively. The fair value of the reporting units is valued using significant inputs that are not observable in the market which are defined as Level 3 inputs pursuant to fair value measurement accounting. The Company determines the fair value of its reporting units using discounted cash flow models.

Other Investments

The Company holds an equity investment that does not have a readily determinable fair value for which the Company uses the measurement alternative prescribed in FASB Accounting Standards Codification Topic 321, Investments-Equity Securities. As of June 30, 2024, the Company held equity investments under the measurement alternative of $11.0 million which are presented in Other non-current assets in the Condensed Consolidated Balance Sheets. There were no impairments or changes resulting from observable transactions for these investments in the three and six months ended June 30, 2024 and no adjustments have been made to the carrying values as of June 30, 2024. There were no equity investments as of December 31, 2023.

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8.    Acquisitions

On February 1, 2023, the Company acquired Atreus Group GmbH ("Atreus"), a leading provider of executive interim management in Germany. The Company paid $33.4 million in the first quarter of 2023, with a subsequent purchase price adjustment payment of $12.1 million in the fourth quarter of 2023. The former owners of Atreus are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $30.0 million and $40.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income milestones for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $32.0 million as of the acquisition date for the earnout liability. The Company recorded $11.3 million for customer relationships, $5.4 million for software, $2.5 million for a trade name and $62.4 million of goodwill. Goodwill is primarily related to the acquired workforce and strategic fit and is not deductible for tax purposes.

On April 1, 2023, the Company acquired businessfourzero, a next generation consultancy specializing in developing and implementing purpose-driven change. In connection with the acquisition, the Company paid $9.5 million in the second quarter of 2023 with a subsequent purchase price adjustment payment of $2.2 million paid in the third quarter of 2023. The former owners of businessfourzero are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $4.0 million and $8.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income metrics for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $4.3 million as of the acquisition date for the earnout liability. The Company recorded $3.5 million for customer relationships, $0.5 million for a trade name, and $7.1 million of goodwill. The goodwill is primarily related to the acquired workforce and strategic fit.

9.    Goodwill and Other Intangible Assets

Goodwill

The Company's goodwill by segment (for the segments that had recorded goodwill) is as follows:

						June 30, 2024						December 31, 2023
Executive Search
Americas						$	91,191					$	91,740
Europe						1,463						1,494
Total Executive Search						92,654						93,234
On-Demand Talent						106,720						109,018
Heidrick Consulting						7,246						7,246
Goodwill, gross						206,620						209,498
Accumulated impairment						(23,470)						(7,246)
Total goodwill						$	183,150					$	202,252

Changes in the carrying amount of goodwill by segment (for the segments that had recorded goodwill) for the six months ended June 30, 2024, are as follows:

			Executive Search												On-Demand Talent						Heidrick Consulting
			Americas						Europe																								Total
Goodwill			$	91,740					$	1,494											$	109,018					$	7,246					$	209,498
Accumulated impairment losses			—						—												—						(7,246)						(7,246)
Balance at December 31, 2023			91,740						1,494												109,018						—						202,252
Impairment			—						(1,463)												(14,761)						—						(16,224)
Foreign currency translation			(549)						(31)												(2,298)						—						(2,878)
Goodwill			91,191						1,463												106,720						7,246						206,620
Accumulated impairment losses			—						(1,463)												(14,761)						(7,246)						(23,470)
Balance at June 30, 2024			$	91,191					$	—											$	91,959					$	—					$	183,150

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During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024.

During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023.

Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions to evaluate the impact of operating and macroeconomic changes on each reporting unit. During the impairment evaluation process, the Company used a discounted cash flow methodology to estimate the fair value of each of its reporting units. The discounted cash flow approach is dependent on a number of factors, including estimates of future market growth and trends, forecasted revenue and costs, capital investments, appropriate discount rates, certain assumptions to allocate shared costs, assets and liabilities, historical and projected performance of the reporting unit, and the macroeconomic conditions affecting each of the Company’s reporting units. The assumptions used in the determination of fair value were (1) a forecast of growth in the near and long term; (2) the discount rate; (3) working capital investments; (4) macroeconomic conditions; and (5) other factors. As part of the goodwill impairment evaluation, the Company performed a reconciliation of its market capitalization to the aggregated estimated fair value of all reporting units, including consideration of a control premium.

Based on the results of the 2024 impairment evaluation, the Company determined that the goodwill within the On-Demand Talent and Europe reporting units were impaired, which resulted in impairment charges of $14.8 million and $1.5 million, respectively. Based on the results of the 2023 impairment evaluation, the Company determined that the goodwill within the Heidrick Consulting reporting unit was impaired, which resulted in an impairment charge of $7.2 million. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024, and 2023, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023. The impairments were non-cash in nature and they did not affect the Company's current liquidity, cash flows, borrowing capability or operations; nor did it impact the debt covenants under the Company's credit agreement.

Other Intangible Assets, net

The Company’s other intangible assets, net by segment, are as follows:

						June 30, 2024						December 31, 2023
Executive Search
Americas						$	11					$	22
Europe						65						95
Total Executive Search						76						117
On-Demand Talent						13,931						17,689
Heidrick Consulting						2,404						3,036
Total other intangible assets, net						$	16,411					$	20,842

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The carrying amount of amortizable intangible assets and the related accumulated amortization are as follows:

			Weighted Average Life (Years)						June 30, 2024																		December 31, 2023
									Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount						Gross Carrying Amount						Accumulated Amortization						Net Carrying Amount
Client relationships			10.2						$	25,729					$	(13,532)					$	12,197					$	26,195					$	(11,443)					$	14,752
Trade name			3.0						4,950						(3,563)						1,387						5,067						(3,069)						1,998
Software			3.0						8,467						(5,640)						2,827						8,629						(4,537)						4,092
Total intangible assets			8.4						$	39,146					$	(22,735)					$	16,411					$	39,891					$	(19,049)					$	20,842

Intangible asset amortization expense for the three months ended June 30, 2024, and 2023, was $1.9 million and $2.6 million, respectively. Intangible asset amortization expense for the six months ended June 30, 2024, and 2023, was $4.2 million and $4.5 million, respectively.

The Company's estimated future amortization expense related to intangible assets as of June 30, 2024, for the following years ended December 31, is as follows:

2024			$	3,620
2025			5,835
2026			2,476
2027			1,506
2028			882
Thereafter			2,092
Total			$	16,411

10.    Other Current and Non-current Assets and Liabilities

The components of other current assets are as follows:

			June 30, 2024						December 31, 2023
Contract assets			$	35,990					$	32,092
Other			7,755						15,831
Total other current assets			$	43,745					$	47,923

The components of other non-current liabilities are as follows:

			June 30, 2024						December 31, 2023
Earnout liability			$	39,700					$	38,601
Other			2,862						3,207
Total other non-current liabilities			$	42,562					$	41,808

11.    Line of Credit

On February 24, 2023, the Company entered into the Second Amendment (the “Second Amendment”) to the Credit Agreement, dated as of October 26, 2018 (the “Credit Agreement” and, as amended by the First Amendment to Credit Agreement, dated as of July 13, 2021, and the Second Amendment, the "Amended Credit Agreement") by and among the Company, Bank of America, N.A., as administrative agent, and the lenders party thereto. The Second Amendment changed the interest rate benchmark, from LIBOR to the Secured Overnight Financing Rate (“SOFR”). At the Company's option, borrowings under the Amended Credit Agreement will bear interest at one-, three- or six-month term SOFR, or an alternate base rate as set forth in the Amended Credit Agreement, in each case plus an applicable margin. Additionally, the Amended Credit Agreement provides the Company with a committed unsecured revolving credit facility in an aggregate amount of $200 million, increased in the Second Amendment from $175 million as set forth in the original version of the Credit Agreement, which includes a sublimit of $25 million for letters of credit and a sublimit of $10 million for swingline loans, with a $75 million expansion feature. The Amended Credit Agreement matures on July 13, 2026.

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Borrowings under the Amended Credit Agreement may be used for working capital, capital expenditures, permitted acquisitions, restricted payments and for other general corporate purposes of the Company and its subsidiaries. The obligations under the Amended Credit Agreement are guaranteed by certain of the Company’s subsidiaries.

As of June 30, 2024, and December 31, 2023, the Company had no outstanding borrowings. As of such dates, the Company was in compliance with the financial and other covenants under the Amended Credit Agreement and no event of default existed.

 

12.    Stock-Based Compensation and Common Stock

On May 23, 2024, the stockholders of the Company approved an amendment and restatement of the Company's Fourth Amended and Restated 2012 Heidrick & Struggles GlobalShare Program (as so amended, the "Fifth A&R Program") to increase the number of shares of common stock reserved for issuance under the plan by 649,000 shares, among other things. The Fifth A&R Program provides for grants of stock options, stock appreciation rights, restricted stock units, performance stock units, and other stock-based compensation awards that are valued based upon the grant date fair value of the awards. These awards may be granted to directors, selected employees and independent contractors.

As of June 30, 2024, 4,744,660 awards have been issued under the Fifth A&R Program, including 792,136 forfeited awards, and 834,082 shares remain available for future awards assuming performance stock units vest at maximum levels. The Fifth A&R Program provides that no awards can be granted after the first annual meeting of the Company's stockholders to occur on or after May 23, 2034.

The Company measures its stock-based compensation costs based on the grant date fair value of the awards and recognizes these costs over the requisite service period.     

A summary of information with respect to stock-based compensation is as follows:

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Salaries and benefits (1)			$	2,429					$	806					$	5,870					$	3,403
General and administrative expenses			1,050						810						1,050						810
Income tax benefit related to stock-based compensation included in net income			958						445						1,907						1,160

(1) Includes $0.1 million of expense and $0.7 million of income related to cash-settled restricted stock units for the three months ended June 30, 2024, and 2023, respectively, and $0.9 million and $0.1 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2024, and 2023, respectively.

Restricted Stock Units

Restricted stock units granted to employees are subject to ratable vesting over a three-year or four-year period dependent upon the terms of the individual grant. Compensation expense related to service-based restricted stock units is recognized on a straight-line basis over the vesting period.

Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fifth A&R Program as part of their annual compensation. Based on their respective elections, the Company issued 16,752 and 16,134 restricted stock units for services provided by the non-employee directors during the three months ended June 30, 2024, and 2023, respectively. Restricted stock units issued to non-employee directors remain unvested until the respective non-employee directors retire from the Board of Directors.

Restricted stock unit activity for the six months ended June 30, 2024, is as follows:

			Number of Restricted Stock Units						Weighted- Average Grant-Date Fair Value
Outstanding on December 31, 2023			686,741						$	30.33
Granted			292,447						33.42
Vested and converted to common stock			(193,056)						33.08
Forfeited			(7,091)						30.15
Outstanding on June 30, 2024			779,041						$	30.81

As of June 30, 2024, there was $10.6 million of pre-tax unrecognized compensation expense related to unvested restricted stock units, which is expected to be recognized over a weighted average of 2.4 years.

Performance Stock Units

The Company grants performance stock units to certain of its senior executives. The majority of performance stock units are subject to cliff vesting at the end of a three-year period. The vesting will vary between 0% and 200% based on the attainment of certain performance and market conditions over the three-year vesting period. Half of the award is based on the achievement of adjusted operating margin or Adjusted EBITDA margin thresholds and half of the award is based on the Company's total shareholder return, relative to a peer group. The fair value of the awards subject to total shareholder return metrics is determined using the Monte Carlo simulation model. A Monte Carlo simulation model uses stock price volatility and other variables to estimate the probability of satisfying the performance conditions and the resulting fair value of the award. The performance stock units are expensed on a straight-line basis over the three-year vesting period.

Certain of the Company's senior executives are granted performance stock units that are subject to ratable vesting over a four-year period. The vesting will vary between 0% and 100% of the shares subject to the performance stock units based on the attainment of specified stock price hurdles over the vesting period. The fair value of the awards subject to such stock price hurdles is determined using the Monte Carlo simulation model. The performance stock units are expensed on a straight-line basis over the derived service period, which ranges from one to four-years.

Performance stock unit activity for the six months ended June 30, 2024, is as follows:

			Number of Performance Stock Units						Weighted- Average Grant-Date Fair Value
Outstanding on December 31, 2023			239,625						$	41.91
Granted			273,536						32.64
Vested and converted to common stock			(104,154)						44.18
Forfeited			(720)						27.82
Outstanding on June 30, 2024			408,287						$	35.14

As of June 30, 2024, there was $8.3 million of pre-tax unrecognized compensation expense related to unvested performance stock units, which is expected to be recognized over a weighted average of 2.6 years.

Phantom Stock Units

Phantom stock units are grants of phantom stock with respect to shares of the Company's common stock that are settled in cash and are subject to various restrictions, including restrictions on transferability, vesting and forfeiture provisions. Shares of phantom stock that do not vest for any reason will be forfeited by the recipient and will revert to the Company.

Phantom stock units are subject to vesting over a three-year or four-year period, and such vesting is subject to certain other conditions, including continued service to the Company. As a result of the cash-settlement feature of the awards, the Company classifies the awards as liability awards, which are measured at fair value at each reporting date and the vested portion of the award is recognized as a liability to the extent that the service condition is deemed probable. The fair value of the phantom stock awards on the balance sheet date is determined using the closing share price of the Company's common stock on that date.

The Company recorded phantom stock-based compensation expense of less than $0.1 million of expense and $0.7 million of income related to cash-settled restricted stock units for the three months ended June 30, 2024, and 2023, respectively, and $0.9 million and $0.1 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2024, and 2023, respectively.

Phantom stock unit activity for the six months ended June 30, 2024, is as follows:

			Number of Phantom Stock Units
Outstanding on December 31, 2023			187,301
Granted			33,247
Vested			—
Forfeited			—
Outstanding on June 30, 2024			220,548

As of June 30, 2024, there was $1.6 million of pre-tax unrecognized compensation expense related to unvested phantom stock units, which is expected to be recognized over a weighted average of 2.5 years.

Common Stock

Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fifth A&R Program as part of their annual compensation, which is typically issued in the second quarter each year. The Company issued 12,564 and 16,134 shares of common stock for services provided by the non-employee directors during the three months ended June 30, 2024, and 2023, respectively.

On February 11, 2008, the Company's Board of Directors authorized management to repurchase shares of the Company's common stock with an aggregate purchase price of up to $50 million (the "Repurchase Authorization"). From time to time and as business conditions warrant, the Company may purchase shares of its common stock on the open market or in negotiated or block trades. No time limit has been set for completion of this program. There were no repurchases of common stock during the three or six months ended June 30, 2024. During the three and six months ended June 30, 2023, the Company purchased 36,000 shares of common stock for $0.9 million. Prior to 2023, the most recent purchase of the Company's shares of common stock occurred during the year ended December 31, 2012. As of June 30, 2024, the Company has purchased 1,074,670 shares of its common stock pursuant to the Repurchase Authorization for a total of $29.2 million and $20.8 million remains available for future purchases under the Repurchase Authorization.

 

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13. Restructuring

During the three months ended June 30, 2024, the Company implemented a restructuring plan (the "2024 Plan") to optimize future growth and profitability through a workforce reduction.

Restructuring charges for the three and six months ended June 30, 2024, by type of charge and reportable segment are as follows:

			Executive Search
			Americas						Europe						Asia Pacific						On-Demand Talent						Heidrick Consulting						Global Operations Support						Total
Employee related			$	1,277					$	876					$	157					$	286					$	3,367					$	976					$	6,939

Changes in the restructuring accrual for the six months ended June 30, 2024, were as follows:

Accrual balance at December 31, 2023						—
Restructuring charges						6,939
Cash payments						(2,570)
Non-cash write-offs						(6)
Exchange rate fluctuations						23
Accrual balance at June 30, 2024						$	4,386

Restructuring accruals are recorded within current Accrued salaries and benefits in the Consolidated Balance Sheets as of June 30, 2024.

14.    Income Taxes

The Company reported loss before taxes of $0.6 million and an income tax provision of $4.6 million for the three months ended June 30, 2024. The Company reported income before taxes of $16.9 million and an income tax provision of $7.9 million for the three months ended June 30, 2023. The effective tax rates for the three months ended June 30, 2024, and 2023, were (798.4)% and 46.8%, respectively. The effective tax rate for the three months ended June 30, 2024, was impacted by the tax effect on goodwill impairment and the mix of income. The effective tax rate for the three months ended June 30, 2023, was impacted by the tax effect on goodwill impairment and the inability to recognize losses.

The Company reported income before taxes of $22.4 million and an income tax provision of $13.5 million for the six months ended June 30, 2024. The Company reported income before taxes of $39.7 million and an income tax provision of $15.1 million for the six months ended June 30, 2023. The effective tax rates for the six months ended June 30, 2024, and 2023, were 60.3% and 38.1%, respectively. The effective tax rate for the six months ended June 30, 2024, was impacted by the tax effect on goodwill impairment and the mix of income. The effective tax rate for the six months ended June 30, 2023, was impacted by the tax effect on goodwill impairment and the inability to recognize losses.

15.    Changes in Accumulated Other Comprehensive Income (Loss)

The changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the six months ended June 30, 2024, are as follows:

						Available- for- Sale Securities						Foreign Currency Translation						Pension						AOCI
Balance at December 31, 2023						$	42					$	647					$	(560)					$	129
Other comprehensive loss before reclassification, net of tax						(24)						(6,161)						—						(6,185)
Balance at June 30, 2024						$	18					$	(5,514)					$	(560)					$	(6,056)

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16.    Segment Information

The Company has five operating segments. The Executive Search business operates in the Americas, Europe (which includes Africa) and Asia Pacific (which includes the Middle East), and the Heidrick Consulting and On-Demand Talent businesses operate globally.

In 2023, the Company changed its measure of segment profitability from operating income to Adjusted EBITDA. The following tables include Adjusted EBITDA, which is the measure of segment profitability reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance. For segment purposes, reimbursements of out-of-pocket expenses classified as revenue and other operating income are reported separately and, therefore, are not included in the results of each segment. The Company believes that analyzing trends in revenue before reimbursements (net revenue), analyzing operating expenses as a percentage of net revenue, and analyzing Adjusted EBITDA and Adjusted EBITDA margin more appropriately reflect its core operations.

The Company evaluates performance and allocates resources based on the chief operating decision maker’s review of (1) net revenue and (2) Adjusted EBITDA, which is defined as net income before interest, other income or expense, income taxes, depreciation and amortization, as adjusted, to the extent they occur, for earnout accretion, earnout fair value adjustments, contingent compensation, deferred compensation plan income or expense, certain reorganization costs, impairment charges and restructuring charges. Adjusted EBITDA margin is defined as Adjusted EBITDA as a percentage of revenue in the same period.

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Revenue before reimbursements (net revenue)						$	278,626					$	271,225					$	543,823					$	510,542
Net income (loss)						(5,157)						8,982						8,875						24,568
Interest, net						(2,612)						(1,913)						(6,698)						(5,162)
Other, net						(997)						(1,377)						(3,568)						(3,186)
Provision for income taxes						4,583						7,893						13,482						15,136
Operating income (loss)						(4,183)						13,585						12,091						31,356
Adjustments
Depreciation						1,990						2,172						4,483						4,176
Intangible amortization						1,920						2,647						4,217						4,516
Earnout accretion						469						451						935						642
Earnout fair value adjustments						1,211						—						1,211						—
Acquisition contingent consideration						3,285						3,784						5,273						5,443
Deferred compensation plan						956						1,603						3,306						3,736
Reorganization costs						—						3,396						—						3,396
Impairment charges						16,224						7,246						16,224						7,246
Restructuring charges						6,939						—						6,939						—
Total adjustments						32,994						21,299						42,588						29,155
Adjusted EBITDA						$	28,811					$	34,884					$	54,679					$	60,511
Adjusted EBITDA margin						10.3		%				12.9		%				10.1		%				11.9		%

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Revenue and Adjusted EBITDA by segment are as follows:

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Revenue
Executive Search
Americas						$	147,078					$	138,563					$	283,757					$	265,890
Europe						40,082						45,567						81,563						84,498
Asia Pacific						22,807						22,649						46,128						46,878
Total Executive Search						209,967						206,779						411,448						397,266
On-Demand Talent						41,895						39,240						79,752						70,357
Heidrick Consulting						26,764						25,206						52,623						42,919
Revenue before reimbursements (net revenue)						278,626						271,225						543,823						510,542
Reimbursements						4,251						2,552						8,152						5,354
Total revenue						$	282,877					$	273,777					$	551,975					$	515,896

						Three Months Ended June 30,												Six Months Ended June 30,
						2024						2023						2024						2023
Adjusted EBITDA
Executive Search
Americas						$	48,112					$	46,079					$	89,983					$	88,203
Europe						2,840						5,456						6,193						7,537
Asia Pacific						1,740						1,630						4,935						5,197
Total Executive Search						52,692						53,165						101,111						100,937
On-Demand Talent						(1,629)						2,587						(2,550)						1,240
Heidrick Consulting						(1,395)						(1,662)						(3,422)						(4,457)
Total segment operating income						49,668						54,090						95,139						97,720
Research and Development						(4,781)						(5,218)						(9,706)						(10,469)
Global Operations Support						(16,076)						(13,988)						(30,754)						(26,740)
Total Adjusted EBITDA						$	28,811					$	34,884					$	54,679					$	60,511

17.    Guarantees

The Company has utilized letters of credit to support certain obligations, primarily for its office lease agreements. The letters of credit were made to secure the respective agreements and are for the terms of the agreements, which extend through 2033. For each letter of credit issued, the Company would have to use cash to fulfill the obligation if there is a default on a payment. The maximum amount of undiscounted payments the Company would be required to make in the event of default on all outstanding letters of credit is approximately $4.8 million as of June 30, 2024. The Company has not accrued for these arrangements as no event of default exists or is expected to exist.

 

18.    Commitments and Contingencies

Litigation

The Company has contingent liabilities from various pending claims and litigation matters arising in the ordinary course of the Company’s business, some of which involve claims for damages that are substantial in amount. Some of these matters are covered in part by insurance. Based upon information currently available, the Company believes the ultimate resolution of such claims and litigation will not have a material adverse effect on its financial condition, results of operations or liquidity.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations as well as other sections of this quarterly report on Form 10-Q contain forward-looking statements within the meaning of the federal securities laws, expectations regarding the Company's One Heidrick strategy and associated investment initiatives. The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements. Forward-looking statements are not historical facts or guarantees of future performance, but instead represent only our beliefs, assumptions, expectations, estimates, forecasts and projections regarding future events, many of which, by their nature, are inherently uncertain and outside our control. Forward-looking statements may be identified by the use of words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “outlook,” “projects,” “forecasts,” "aim," and similar expressions. These statements include statements other than historical information or statements of current condition and may relate to our future plans and objectives and results. By identifying these statements for you in this manner, we are alerting you to the possibility that our actual results and financial condition may differ, possibly materially, from the anticipated results and financial condition indicated in these forward-looking statements.

Factors that may cause actual outcomes and results to differ materially from what is expressed, forecasted or implied in the forward-looking statements include, among other things, our ability to attract, integrate, develop, manage, retain and motivate qualified consultants and senior leaders; our ability to prevent our consultants from taking our clients with them to another firm; our ability to maintain our professional reputation and brand name; our clients’ ability to restrict us from recruiting their employees; our heavy reliance on information management systems; risks arising from our implementation of new technology and intellectual property to deliver new products and services to our clients; our dependence on third parties for the execution of certain critical functions; the fact that we face the risk of liability in the services we perform; the fact that data security, data privacy and data protection laws and other evolving regulations and cross-border data transfer restrictions may limit the use of our services and adversely affect our business; any challenges to the classification of our on-demand talent as independent contractors; the fact that increased cybersecurity requirements, vulnerabilities, threats and more sophisticated and targeted cyber-related attacks could pose a risk to our systems, networks, solutions, services and data; the fact that our net revenue may be affected by adverse macroeconomic or labor market conditions, including impacts of inflation and effects of geopolitical instability; the aggressive competition we face; the impact of foreign currency exchange rate fluctuations; our ability to access additional credit; social, political, regulatory, legal and economic risks in markets where we operate, including the impact of the ongoing war in Ukraine and the conflict in Israel and the Gaza strip, the risks of an expansion or escalation of those conflicts and our ability to quickly and completely recover from any disruption to our business; unfavorable tax law changes and tax authority rulings; our ability to realize the benefit of our net deferred tax assets; the fact that we may not be able to align our cost structure with net revenue; any impairment of our goodwill, other intangible assets and other long-lived assets; our ability to maintain an effective system of disclosure controls and internal control over our financial reporting and produce accurate and timely financial statements; our ability to execute and integrate future acquisitions; and the fact that we have anti-takeover provisions that make an acquisition of us difficult and expensive. We caution the reader that the list of factors may not be exhaustive. For more information on the factors that could affect the outcome of forward-looking statements, refer to our Annual Report on Form 10-K for the year ended December 31, 2023, under the heading "Risk Factors" in Item 1A, and any subsequent Company filings with the Securities and Exchange Commission ("SEC"). We caution the reader that the list of factors may not be exhaustive. We undertake no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

Executive Overview

Our Business. Heidrick & Struggles International, Inc. (the "Company," "we," "us," or "our") is a human capital leadership advisory firm providing executive search, consulting and on-demand talent services to businesses and business leaders worldwide to help them to improve the effectiveness of their leadership teams. We provide our services to a broad range of clients through the expertise of 500 consultants located in major cities around the world. The Company and its predecessors have been leadership advisors for more than 70 years.

Our service offerings include the following:

Executive Search. We partner with our clients, respected organizations across the globe, to help them build and sustain the best leadership teams in the world, with a specialized focus on the placement of top-level senior executives. Through our unique relationship-based, data-driven approach, we help our clients find the right leaders, set them up for success, and accelerate their and their team’s performance.

We believe focusing on top-level senior executives provides the opportunity for several competitive advantages including access to and influence with key decision makers, increased potential for recurring search and consulting engagements, higher

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fees per search engagement, enhanced brand visibility, and a leveraged global footprint. Working at the top of client organizations also facilitates the attraction and retention of high-caliber consultants who desire to serve top industry executives and their leadership needs. Our executive search services derive revenue through the fees generated for each search engagement, which generally are based on the annual compensation for the placed executive. We provide our executive search services primarily on a retained basis.

We employ a global approach to executive search built on better insights, more data and faster decision making facilitated by the use of our Heidrick Leadership Framework and Heidrick Connect. Our Heidrick Leadership Framework allows clients to holistically evaluate a candidate's pivotal experience and expertise, leadership capabilities, agility and potential, and culture fit and impact, thereby allowing our clients to find the right person for the role. We supplement our Heidrick Leadership Framework through a series of additional online tools including our Leadership Accelerator, Leadership Signature and Culture Signature assessments. Heidrick Connect, a completely digital, always available client experience portal, allows our clients to access talent insights for each engagement, including the Heidrick Leadership Framework and other internally developed assessment tools. In response to working remotely, our Executive Search teams employed Heidrick Connect to operate effectively and efficiently while engaging virtually with our clients. Additionally, we have introduced upgrades to Heidrick Connect, resulting in greater flexibility, increased productivity and the ability to deliver more insights to our clients.

The executive search industry consists of several thousand executive search firms worldwide. Executive search firms are generally separated into two broad categories: retained search and contingency search. Retained executive search firms fulfill their clients’ senior leadership needs by identifying potentially qualified candidates and assisting clients in evaluating and assessing these candidates. Retained executive search firms generally are compensated for their services regardless of whether the client employs a candidate identified by the search firm and are generally retained on an exclusive basis. Typically, retained executive search firms are paid a retainer for their services equal to approximately one-third of the estimated first year compensation for the position to be filled. In addition, if the actual compensation of a placed candidate exceeds the estimated compensation, executive search firms often are authorized to bill the client for one-third of the excess. In contrast, contingency search firms are compensated only upon successfully placing a recommended candidate.

We are a retained executive search firm. Our search process typically consists of the following steps:

•Analyzing the client’s business needs in order to understand its organizational structure, relationships and culture, advising the client as to the required set of skills and experiences for the position, and identifying with the client the other characteristics desired of the successful candidate;

•Selecting, contacting, interviewing and evaluating candidates on the basis of experience and potential cultural fit with the client organization;

•Presenting confidential written reports on the candidates who potentially fit the position specification;

•Scheduling a mutually convenient meeting between the client and each candidate;

•Completing reference checks on the final candidate selected by the client; and

•Assisting the client in structuring compensation packages and supporting the successful candidate’s integration into the client team.

On-Demand Talent. Our on-demand talent services provide clients seamless on-demand access to top independent talent, including professionals with deep industry and functional expertise for interim leadership roles and critical, project-based initiatives. Our unique model delivers the right independent talent on demand by blending proprietary data and technology with a dedicated Talent Solutions team.

Heidrick Consulting. We partner with organizations through Heidrick Consulting to unlock the power of their people. Our tools and experts use data and technology designed to bring science to the art of human capital development and organizational design. Our services allow our clients to accelerate their strategies and the effectiveness of individual leaders, teams and organizations as a whole.

Heidrick Consulting offers our clients impactful approaches to human capital development through a myriad of solutions, ranging from leadership assessment and development, team and organization acceleration, digital acceleration and innovation, diversity and inclusion advisory services, and culture shaping. Applying our deep understanding of the behaviors and attributes of leaders across many of the world’s premier companies, we guide our clients as they build a thriving culture of future-ready

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leadership. These premium services and offerings, which complement our Executive Search expertise, significantly contribute to our ability to deliver a full-service human capital consulting solution to our clients.

Our consulting services generate revenue primarily through the professional fees generated for each engagement which are generally based on the size of the project and scope of services. Our Heidrick Consulting teams have pivoted to create new digital solutions for Leadership Assessments, Team Acceleration, and Organization and Culture Acceleration that can be delivered virtually.

We also remain focused on expanding our revenue streams beyond our executive search business through the investment in the diversification of our product offerings, namely our One Heidrick strategy, and soon to include Heidrick Digital. Through these diversified solutions, we intend to meet our clients' growing talent and human capital needs by providing a more comprehensive suite of offerings.

Key Performance Indicators

We manage and assess our performance through various means, with primary financial and operational measures including net revenue, Adjusted EBITDA (defined below; non-GAAP) and Adjusted EBITDA margin (defined below; non-GAAP). These non-GAAP financial measures should be considered in addition to, and not as a substitute for or superior to, any measure of performance prepared in accordance with GAAP (defined below). Executive Search and Heidrick Consulting performance is also measured using consultant headcount. Specific to Executive Search, confirmed search (confirmation) trends, consultant productivity and average revenue per search are used to measure performance. Productivity is as measured by annualized Executive Search net revenue per consultant.

Revenue is driven by market conditions and a combination of the number of executive search engagements, consulting projects, on-demand projects and the average revenue per search or project. With the exception of compensation expense and cost of sales, incremental increases in revenue do not necessarily result in proportionate increases in costs, particularly operating and administrative expenses, thus creating the potential to improve Adjusted EBITDA and Adjusted EBITDA margin.

The number of consultants, confirmation trends, number of searches or projects completed, productivity levels and the average revenue per search or project will vary from quarter to quarter, affecting net revenue, Adjusted EBITDA and Adjusted EBITDA margin.

The Company evaluates performance and allocates resources based on the chief operating decision maker’s review of (1) net revenue and (2) Adjusted EBITDA, which is defined as net income before interest, other income or expense, income taxes, depreciation and amortization, as adjusted, to the extent they occur, for earnout accretion, earnout fair value adjustments, contingent compensation, deferred compensation plan income or expense, certain reorganization costs, impairment charges and restructuring charges. Adjusted EBITDA margin is defined as Adjusted EBITDA as a percentage of net revenue in the same period.

Consolidated Adjusted EBITDA and Adjusted EBITDA margin and total Executive Search Adjusted EBITDA and Adjusted EBITDA margin are non-GAAP financial measures and have limitations as analytical tools. They should not be viewed as a substitute for financial information determined in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) and should not be considered in isolation or as a substitute for analysis of the Company’s results as reported under GAAP. In addition, they may not necessarily be comparable to non-GAAP performance measures that may be presented by other companies.

We believe the presentation of these non-GAAP financial measures provides meaningful supplemental information and, when presented together with financial measures that have been determined in accordance with GAAP, a more complete understanding of our ongoing operating results, including underlying trends. These non-GAAP financial measures are used by management in their financial and operating decision making because management believes they reflect our ongoing business in a manner that allows for meaningful period-to-period comparison and evaluation. We also believe that these non-GAAP financial measures, when considered together with our GAAP financial measures, provide management and investors with additional information for comparison of our operating results with the operating results of other companies.

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Our Compensation Model

At the consultant level, there are fixed and variable components of compensation. Individuals are rewarded for their performance based on a system that directly ties a portion of their compensation to the amount of net revenue for which they are responsible. A portion of the reward may be based upon individual performance against a series of non-financial measures. Credit towards the variable portion of a consultant’s compensation is earned by generating net revenue for winning and executing work. Each quarter, we review and update the expected annual performance of all consultants and accrue variable compensation accordingly. The amount of variable compensation that is accrued for each consultant is based on a tiered payout model. Overall, Company performance determines the amount available for total variable compensation. The more net revenue that is generated by the consultant, the higher the percentage credited towards the consultant’s variable compensation and thus accrued by our Company as expense.

The mix of individual consultants who generate revenue can significantly affect the total amount of compensation expense recorded, which directly impacts operating margin. As a result, the variable portion of the compensation expense may fluctuate significantly from quarter to quarter. The total variable compensation is discretionary and is based on Company-wide financial targets approved by the Human Resources and Compensation Committee of the Board of Directors. We pay annual bonuses in the first half of the year following the year in which they are earned.

Results of Operations

(In the following tables, totals and sub-totals may not equal the sum of individual line items due to rounding. All tables are in thousands, except percentages.)

The following table summarizes, for the periods indicated, our results of operations as a percentage of revenue before reimbursements (net revenue): 

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Revenue
Revenue before reimbursements (net revenue)			100.0		%				100.0		%				100.0		%				100.0		%
Reimbursements			1.5						0.9						1.5						1.0
Total revenue			101.5						100.9						101.5						101.0
Operating expenses
Salaries and benefits			63.8						66.0						64.8						66.2
General and administrative expenses			16.7						14.9						16.1						14.7
Cost of services			10.7						9.3						10.5						9.4
Research and development			2.0						2.1						2.1						2.2
Impairment charges			5.8						2.7						3.0						1.4
Restructuring charges			2.5						—						1.3						—
Reimbursed expenses			1.5						0.9						1.5						1.0
Total operating expenses			103.0						95.9						99.3						94.9
Operating income (loss)			(1.5)						5.0						2.2						6.1
Non-operating income
Interest, net			0.9						0.7						1.2						1.0
Other, net			0.4						0.5						0.7						0.6
Net non-operating income			1.3						1.2						1.9						1.6
Income before income taxes			(0.2)						6.2						4.1						7.8
Provision for income taxes			1.6						2.9						2.5						3.0
Net income (loss)			(1.9)		%				3.3		%				1.6		%				4.8		%

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The following table sets forth, for the periods indicated, a reconciliation of Adjusted EBITDA to net income:

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Revenue before reimbursements (net revenue)			$	278,626					$	271,225					$	543,823					$	510,542
Net income (loss)			(5,157)						8,982						8,875						24,568
Interest, net			(2,612)						(1,913)						(6,698)						(5,162)
Other, net			(997)						(1,377)						(3,568)						(3,186)
Provision for income taxes			4,583						7,893						13,482						15,136
Operating income (loss)			(4,183)						13,585						12,091						31,356
Adjustments
Depreciation			1,990						2,172						4,483						4,176
Intangible amortization			1,920						2,647						4,217						4,516
Earnout accretion			469						451						935						642
Earnout fair value adjustments			1,211						—						1,211						—
Acquisition contingent consideration			3,285						3,784						5,273						5,443
Deferred compensation plan			956						1,603						3,306						3,736
Reorganization costs			—						3,396						—						3,396
Impairment charges			16,224						7,246						16,224						7,246
Restructuring charges			6,939						—						6,939						—
Total adjustments			32,994						21,299						42,588						29,155
Adjusted EBITDA			$	28,811					$	34,884					$	54,679					$	60,511
Adjusted EBITDA margin			10.3		%				12.9		%				10.1		%				11.9		%

Revenue and Adjusted EBITDA by segment are as follows:

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Revenue
Executive Search
Americas			$	147,078					$	138,563					$	283,757					$	265,890
Europe			40,082						45,567						81,563						84,498
Asia Pacific			22,807						22,649						46,128						46,878
Total Executive Search			209,967						206,779						411,448						397,266
On-Demand Talent			41,895						39,240						79,752						70,357
Heidrick Consulting			26,764						25,206						52,623						42,919
Revenue before reimbursements (net revenue)			278,626						271,225						543,823						510,542
Reimbursements			4,251						2,552						8,152						5,354
Total revenue			$	282,877					$	273,777					$	551,975					$	515,896

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			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Adjusted EBITDA
Executive Search
Americas			$	48,112					$	46,079					$	89,983					$	88,203
Europe			2,840						5,456						6,193						7,537
Asia Pacific			1,740						1,630						4,935						5,197
Total Executive Search			52,692						53,165						101,111						100,937
On-Demand Talent			(1,629)						2,587						(2,550)						1,240
Heidrick Consulting			(1,395)						(1,662)						(3,422)						(4,457)
Total segment operating income			49,668						54,090						95,139						97,720
Research and Development			(4,781)						(5,218)						(9,706)						(10,469)
Global Operations Support			(16,076)						(13,988)						(30,754)						(26,740)
Total Adjusted EBITDA			$	28,811					$	34,884					$	54,679					$	60,511

Three Months Ended June 30, 2024, Compared to the Three Months Ended June 30, 2023

Total revenue. Consolidated total revenue increased $9.1 million, or 3.3%, to $282.9 million for the three months ended June 30, 2024, from $273.8 million for the three months ended June 30, 2023. The increase in total revenue was primarily due to the increase in revenue before reimbursements (net revenue) described below.

Revenue before reimbursements (net revenue). Consolidated net revenue increased $7.4 million, or 2.7%, to $278.6 million for the three months ended June 30, 2024, compared to $271.2 million for the three months ended June 30, 2023. Foreign exchange rate fluctuations negatively impacted results by $1.1 million, or 0.4%. Executive Search net revenue was $210.0 million for the three months ended June 30, 2024, an increase of $3.2 million, or 1.5%, compared to the three months ended June 30, 2023. The increase in Executive Search net revenue was primarily due to an increase in the average revenue per search. On-Demand Talent net revenue was $41.9 million for the three months ended June 30, 2024, an increase of $2.7 million, or 6.8%, compared to the three months ended June 30, 2023. The increase in On-Demand Talent revenue was primarily due to an increase in the volume of On-Demand projects. Heidrick Consulting net revenue was $26.8 million for the three months ended June 30, 2024, an increase of $1.6 million, or 6.2%, compared to the three months ended June 30, 2023. The increase in Heidrick Consulting revenue was primarily due to an increase in leadership assessment and development consulting engagements compared to the prior year period.

The number of Executive Search and Heidrick Consulting consultants was 415 and 85, respectively, as of June 30, 2024, compared to 423 and 89, respectively, as of June 30, 2023. Executive Search productivity, as measured by annualized net Executive Search revenue per consultant, was $2.0 million and $1.9 million for the three months ended June 30, 2024, and 2023, respectively. The average revenue per executive search was $151,000 and $146,000 for the three months ended June 30, 2024, and 2023, respectively.

Salaries and benefits. Consolidated salaries and benefits expense decreased $1.0 million, or 0.6%, to $177.9 million for the three months ended June 30, 2024, compared to $178.9 million for the three months ended June 30, 2023. Fixed compensation decreased $3.0 million due to decreases in separation costs, talent acquisition and retention costs, retirement and benefits costs, and expenses related to the deferred compensation plan, partially offset by increases in stock compensation, and base salaries and payroll taxes. Variable compensation increased $1.9 million due to higher bonus accruals related to increased consultant productivity. Foreign exchange rate fluctuations positively impacted results by $0.7 million, or 0.4%.

For the three months ended June 30, 2024, we had an average of 2,196 employees compared to an average of 2,246 employees for the three months ended June 30, 2023.

As a percentage of net revenue, salaries and benefits expense was 63.8% for the three months ended June 30, 2024, compared to 66.0% for the three months ended June 30, 2023.

General and administrative expenses. Consolidated general and administrative expenses increased $5.9 million, or 14.7%, to $46.5 million for the three months ended June 30, 2024, compared to $40.5 million for the three months ended June 30, 2023. The increase in general and administrative expenses was due to costs associated with the 2024 Global Partner Conference, an adjustment to increase the earnout accruals for Atreus Group GmbH ("Atreus") and businessfourzero,

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professional fees, hiring fees, and marketing expenses, partially offset by a decrease in intangible amortization. Foreign exchange rate fluctuations positively impacted results by $0.1 million, or 0.3%.

As a percentage of net revenue, general and administrative expenses were 16.7% for the three months ended June 30, 2024, compared to 14.9% for the three months ended June 30, 2023.

Cost of services. Consolidated cost of services increased $4.4 million, or 17.3%, to $29.7 million for the three months ended June 30, 2024, compared to $25.3 million for the three months ended June 30, 2023. The increase in cost of services was primarily due to an increase in the volume of On-Demand Talent and consulting projects. Foreign exchange rate fluctuations positively impacted results by $0.1 million, or 0.5%.

As a percentage of net revenue, cost of services was 10.7% for the three months ended June 30, 2024, compared to 9.3% for the three months ended June 30, 2023.

Research and development. Due to the rapid pace of technological advances and digital disruption many of our clients are experiencing, we believe our ability to compete successfully depends increasingly upon our ability to provide clients with timely and relevant technology-enabled products and services. As such, we are focused on developing new technologies to enhance existing products and services, and to expand the range of our offerings through research and development (“R&D”), licensing of intellectual property and acquisition of third-party businesses and technology. We plan to utilize the results of our R&D efforts to develop and enhance new and existing services and products across our current offerings in Executive Search, Heidrick Consulting and On-Demand Talent, and for products and services in new segments that we may embark upon in the future from time to time, such as our new digital product Heidrick Navigator. Consolidated R&D expense decreased $0.1 million, or 0.9%, to $5.6 million for the three months ended June 30, 2024, compared to $5.7 million for the three months ended June 30, 2023. R&D expenses consist of expenses related to payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development.

Impairment charges. During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024. Based on the results of the of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $14.8 million in On-Demand Talent reporting unit, as well as an impairment charge of $1.5 million in the Europe reporting unit. During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023. Based on the results of the of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $7.2 million in Heidrick Consulting to write-off all of the goodwill associated with that reporting unit. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statement of Comprehensive Income (Loss) for the three months ended June 30, 2024, and 2023, respectively, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024 and 2023, respectively. The impairment was non-cash in nature and did not affect our current liquidity, cash flows, borrowing capability or operations, nor did it impact the debt covenants under our credit agreement.

Restructuring charges. The Company incurred $6.9 million in restructuring charges during the three months ended June 30, 2024, related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

Adjusted EBITDA. Consolidated Adjusted EBITDA was $28.8 million for the three months ended June 30, 2024, a decrease of $6.1 million, or 17.4%, compared to $34.9 million for the three months ended June 30, 2023. Adjusted EBITDA margin was 10.3% for the three months ended June 30, 2024, compared to 12.9% for the three months ended June 30, 2023.

Net non-operating income. Net non-operating income was $3.6 million for the three months ended June 30, 2024, compared to $3.3 million for the three months ended June 30, 2023.

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Interest, net, was $2.6 million of income for the three months ended June 30, 2024, compared to $1.9 million for the three months ended June 30, 2023, primarily due to higher interest rates on a higher volume of short-term investments.

Other, net, was $1.0 million of income for the three months ended June 30, 2024, compared to $1.4 million for the three months ended June 30, 2023. The income for the three months ended June 30, 2024, was primarily due to unrealized gains on the deferred compensation plan and foreign exchange gains. The income for the three months ended June 30, 2023, was primarily due to unrealized gains on the deferred compensation plan, partially offset by foreign exchange losses. The majority of the Company's investments, including those held in the Company’s deferred compensation plan, are recorded at fair value.

Income taxes. See Note 14, Income Taxes.

Executive Search

Americas

The Americas segment reported net revenue of $147.1 million for the three months ended June 30, 2024, an increase of 6.1% compared to $138.6 million for the three months ended June 30, 2023. The increase in net revenue was primarily due to an increase in the revenue per search, as well as a 2.5% increase in the number of executive search engagements. All practice groups exhibited growth over the prior period. Foreign exchange rate fluctuations negatively impacted results by $0.2 million, or 0.1%. There were 216 Executive Search consultants in the Americas segment at June 30, 2024, compared to 219 at June 30, 2023.

Salaries and benefits expense increased $4.6 million, or 5.5%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023. Fixed compensation decreased $1.0 million due to decreases in expenses related to the deferred compensation plan, retirement and benefits costs, base salaries and payroll taxes, talent acquisition and retention costs, and separation costs, partially offset by an increase in stock compensation. Variable compensation increased $5.6 million due to higher bonus accruals related to increased consultant productivity.

General and administrative expenses increased $0.9 million, or 7.2%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to increases in costs associated with the 2024 Global Partner Conference, expenses related to information technology, and professional fees, partially offset by decreases in office occupancy costs, business development travel, the use of external third-party consultants, and bad debt.

Restructuring charges for the three months ended June 30, 2024, were $1.3 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

The Americas segment reported Adjusted EBITDA of $48.1 million for the three months ended June 30, 2024, an increase of $2.0 million compared to $46.1 million for the three months ended June 30, 2023. Adjusted EBITDA margin was 32.7% for the three months ended June 30, 2024, compared to 33.3% for the three months ended June 30, 2023.

Europe

The Europe segment reported net revenue of $40.1 million for the three months ended June 30, 2024, a decrease of 12.0% compared to $45.6 million for the three months ended June 30, 2023. The decrease in net revenue was primarily due to an 18.0% decrease in the number of executive search engagements. The Life Sciences practice group exhibited growth over the prior year period. Foreign exchange rate fluctuations negatively impacted results by $0.2 million, or 0.3%. There were 121 Executive Search consultants in the Europe segment at June 30, 2024, compared to 129 at June 30, 2023.

Salaries and benefits expense decreased $6.9 million, or 19.1%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023. Fixed compensation decreased $4.0 million due to decreases in separation costs, talent acquisition and retention costs, base salaries and payroll taxes, and retirement and benefits costs, partially offset by an increase in stock compensation. Variable compensation decreased $2.9 million due to lower bonus accruals related to decreased consultant productivity.

General and administrative expense increased $1.0 million, or 13.9%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to office occupancy costs, and business development travel, partially offset by decreases in professional fees and the use of external third-party consultants.

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Impairment charges for the three months ended June 30, 2024, were $1.5 million as a result of an interim goodwill impairment evaluation. The impairment charge is recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024.

Restructuring charges for the three months ended June 30, 2024, were $0.9 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

The Europe segment reported Adjusted EBITDA of $2.8 million for the three months ended June 30, 2024, a decrease of $2.6 million compared to $5.5 million for the three months ended June 30, 2023. Adjusted EBITDA margin was 7.1% for the three months ended June 30, 2024, compared to 12.0% for the three months ended June 30, 2023.

Asia Pacific

The Asia Pacific segment reported net revenue of $22.8 million for the three months ended June 30, 2024, an increase of 0.7% compared to $22.6 million for the three months ended June 30, 2023. The increase in net revenue was primarily due to a 14.7% increase in the number of executive search confirmations. All practice groups, with the exception of Consumer and Social Impact, exhibited growth over the prior period. Foreign exchange rate fluctuations negatively impacted results by $0.6 million, or 2.6%. There were 78 Executive Search consultants in the Asia Pacific segment at June 30, 2024, compared to 75 at June 30, 2023.

Salaries and benefits expense decreased $0.3 million, or 2.0%, for the three months ended June 30, 2024, compared to the three months June 30, 2023. Fixed compensation increased $0.2 million due to increases in talent acquisition and retention costs, retirement and benefits costs, and stock compensation, partially offset by decreases in base salaries and payroll taxes, and separation costs. Variable compensation decreased $0.6 million due to lower bonus accruals related to decreased consultant productivity.

General and administrative expenses increased $0.2 million, or 5.6%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to increases in bad debt, and costs related to taxes and licenses, partially offset by decreases in professional fees and office occupancy costs.

Restructuring charges for the three months ended June 30, 2024, were $0.2 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

The Asia Pacific segment reported Adjusted EBITDA of $1.7 million for the three months ended June 30, 2024, an increase of $0.1 million compared to $1.6 million for the three months ended June 30, 2023. Adjusted EBITDA margin was 7.6% for the three months ended June 30, 2024, compared to 7.2% for the three months ended June 30, 2023.

On-Demand Talent

The On-Demand Talent segment reported net revenue of $41.9 million for the three months ended June 30, 2024, an increase of 6.8% compared to $39.2 million for the three months ended June 30, 2023. The increase in On-Demand Talent revenue was primarily due to an increase in the volume of On-Demand projects. Foreign exchange rate fluctuations negatively impacted results by $0.2 million, or 0.5%.

Salaries and benefits expense increased $0.4 million, or 3.2%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023. Fixed compensation decreased $0.7 million due to decreases in separation costs, and retirement and benefits costs, partially offset by increases in base salaries and payroll taxes, talent acquisition and retention costs, and stock compensation. Variable compensation increased $1.1 million due to higher bonus accruals related to increased productivity.

General and administrative expense increased $2.3 million, or 41.2%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to an adjustment to increase the earnout accrual for Atreus, increases in hiring fees, expenses related to information technology, office occupancy costs, marketing expenses, and taxes and licenses costs, partially offset by decreases in business development travel and intangible amortization.

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Cost of services increased $3.7 million, or 15.7%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, primarily due to an increase in the volume of On-Demand Talent projects.

During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024. Based on the results of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $14.8 million in On-Demand Talent reporting unit. The impairment charge is recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024.

Restructuring charges for the three months ended June 30, 2024, were $0.3 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

The On-Demand Talent segment reported an Adjusted EBITDA loss of $1.6 million for the three months ended June 30, 2024, a decrease of $4.2 million compared to Adjusted EBITDA of $2.6 million for the three months ended June 30, 2023. Adjusted EBITDA margin was (3.9)% for the three months ended June 30, 2024, compared to 6.6% for the three months ended June 30, 2023.

Heidrick Consulting

The Heidrick Consulting segment reported net revenue of $26.8 million for the three months ended June 30, 2024, an increase of 6.2% compared to $25.2 million for the three months ended June 30, 2023. The increase in net revenue was primarily due to increases in leadership assessment and development consulting engagements compared to the prior year period. Foreign exchange rate fluctuations negatively impacted results by less than $0.1 million, or 0.1%. There were 85 Heidrick Consulting consultants at June 30, 2024 compared to 89 at June 30, 2023.

Salaries and benefits expense decreased $0.1 million, or 0.6%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023. Fixed compensation increased $0.8 million due to increases in base salaries and payroll taxes, and retirement and benefits costs, partially offset by decreases in stock compensation, and talent acquisition and retention costs. Variable compensation decreased $1.0 million due to a decrease in headcount as a result of the workforce reduction.

General and administrative expenses increased $0.8 million, or 13.9%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to increases in office occupancy costs.

Cost of services increased $0.7 million, or 41.3%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to an increase in the volume of consulting projects requiring third-party consultants.

During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023. Based on the results of the of the impairment evaluation, the Company recorded an impairment charge of $7.2 million in Heidrick Consulting to write-off all of the goodwill associated with that reporting unit.

Restructuring charges for the three months ended June 30, 2024, were $3.4 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

The Heidrick Consulting segment reported an Adjusted EBITDA loss of $1.4 million for the three months ended June 30, 2024, an improvement of $0.3 million compared to an Adjusted EBITDA loss of $1.7 million for the three months ended June

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30, 2023. Adjusted EBITDA margin was (5.2)% for the three months ended June 30, 2024, compared to (6.6)% for the three months ended June 30, 2023.

Global Operations Support

Salaries and benefits expense increased $1.3 million, or 15.8%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to increases in stock compensation, and base salaries and payroll taxes, partially offset by a decrease in variable compensation.

General and administrative expenses increased $0.8 million, or 12.7%, for the three months ended June 30, 2024, compared to the three months ended June 30, 2023, due to increases in professional fees, office occupancy costs, and business development travel, partially offset by decreases in hiring fees, expenses related to information technology, and taxes and licenses costs.

Restructuring charges for the three months ended June 30, 2024, were $1.0 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three months ended June 30, 2024.

Global Operations Support reported an Adjusted EBITDA loss of $16.1 million for the three months ended June 30, 2024, a decrease of $2.1 million compared to an Adjusted EBITDA loss of $14.0 million for the three months ended June 30, 2023. Adjusted EBITDA margin was (5.7)% for the three months ended June 30, 2024, compared to (5.1)% for the three months ended June 30, 2023.

Six Months Ended June 30, 2024, Compared to the Six Months Ended June 30, 2023

Total revenue. Consolidated total revenue increased $36.1 million, or 7.0%, to $552.0 million for the six months ended June 30, 2024, compared to $515.9 million for the six months ended June 30, 2023. The increase in total revenue was primarily due to the increase in revenue before reimbursements (net revenue) described below.

Revenue before reimbursements (net revenue). Consolidated net revenue increased $33.3 million, or 6.5%, to $543.8 million for the six months ended June 30, 2024, compared to $510.5 million for the six months ended June 30, 2023. Foreign exchange rate fluctuations had an immaterial impact on net revenue. Executive Search net revenue was $411.4 million for the six months ended June 30, 2024, an increase of $14.2 million, or 3.6%, compared to the six months ended June 30, 2023. The increase in Executive Search net revenue was primarily due to an increase in the average revenue per search. On-Demand Talent net revenue was $79.8 million for the six months ended June 30, 2024, an increase of $9.4 million, or 13.4%, compared to the six months ended June 30, 2023. The increase in On-Demand Talent revenue was primarily due to an increase in the volume of On-Demand projects and the timing of the Atreus acquisition in February 2023. Heidrick Consulting net revenue was $52.6 million for the six months ended June 30, 2024, an increase of $9.7 million, or 22.6%, compared to the six months ended June 30, 2023. The increase in Heidrick Consulting revenue was primarily due an increase in leadership assessment and development consulting engagements compared to the prior year period and the timing of the businessfourzero acquisition in April 2023.

The number of Executive Search and Heidrick Consulting consultants was 415 and 85, respectively, as of June 30, 2024, compared to 423 and 89, respectively, as of June 30, 2023. Executive Search productivity, as measured by annualized net Executive Search revenue per consultant, was $2.0 million and $1.9 million for the six months ended June 30, 2024, and 2023, respectively. The average revenue per executive search was $143,000 and $135,000 for the six months ended June 30, 2024, and 2023, respectively.

Salaries and benefits. Consolidated salaries and benefits expense increased $14.5 million, or 4.3%, to $352.3 million for the six months ended June 30, 2024, compared to $337.8 million for the six months ended June 30, 2023. Fixed compensation increased $2.4 million due to increases in base salaries and payroll taxes, stock compensation, and talent acquisition and retention costs, partially offset by decreases in separation costs, retirement and benefit costs, and the deferred compensation plan. Variable compensation increased $12.1 million due to higher bonus accruals related to increased consultant productivity. Foreign exchange rate fluctuations negatively impacted results by $0.1 million, or less than 0.1%.

For the six months ended June 30, 2024, we had an average of 2,207 employees compared to an average of 2,199 employees for the six months ended June 30, 2023.

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As a percentage of net revenue, salaries and benefits expense was 64.8% for the six months ended June 30, 2024, compared to 66.2% for the six months ended June 30, 2023.

General and administrative expenses. Consolidated general and administrative expenses increased $13.0 million, or 17.3%, to $87.8 million for the six months ended June 30, 2024, compared to $74.8 million for the six months ended June 30, 2023. The increase in general and administrative expenses was due to increases in costs associated with the 2024 Global Partner Conference, increases in earnout accruals for Atreus and businessfourzero, office occupancy costs, business development travel, professional fees, information technology costs, hiring fees, marketing expenses, taxes and licenses costs, and bad debt, partially offset by decreases in costs related to the use of external third-party consultants, insurance and bank fees, and communication services costs. Foreign exchange rate fluctuations negatively impacted results by $0.1 million, or 0.2%.

As a percentage of net revenue, general and administrative expenses were 16.1% for the six months ended June 30, 2024, compared to 14.7% for the six months ended June 30, 2023.

Cost of services. Consolidated cost of services increased $9.0 million, or 18.7%, to $57.1 million for the six months ended June 30, 2024, compared to $48.1 million for the six months ended June 30, 2023. The increase in cost of services was primarily due to an increase in the volume of On-Demand Talent and consulting projects, and the timing of the Atreus acquisition in February 2023. Foreign exchange rate fluctuations negatively impacted results by $0.1 million, or 0.2%.

As a percentage of net revenue, cost of services was 10.5% for the six months ended June 30, 2024, compared to 9.4% for the six months ended June 30, 2023.

Research and development. Due to the rapid pace of technological advances and digital disruption many of our clients are experiencing, we believe our ability to compete successfully depends increasingly upon our ability to provide clients with timely and relevant technology-enabled products and services. As such, we are focused on developing new technologies to enhance existing products and services, and to expand the range of our offerings through research and development (“R&D”), licensing of intellectual property and acquisition of third-party businesses and technology. We plan to utilize the results of our R&D efforts to develop and enhance new and existing services and products across our current offerings in Executive Search, Heidrick Consulting and On-Demand Talent, and for products and services in new segments that we may embark upon in the future from time to time, such as our new digital product Heidrick Navigator. Consolidated R&D expense increased $0.1 million, or 1.2%, to $11.3 million for the six months ended June 30, 2024, compared to $11.2 million for the six months ended June 30, 2023. R&D expenses consist of expenses related to payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development.

Impairment charges. During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024. Based on the results of the of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $14.8 million in On-Demand Talent reporting unit, as well as an impairment charge of $1.5 million in the Europe reporting unit. During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023.Based on the results of the of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $7.2 million in Heidrick Consulting to write-off all of the goodwill associated with that reporting unit. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statement of Comprehensive Income (Loss) for the six months ended June 30, 2024, and 2023, respectively, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023, respectively. The impairment was non-cash in nature and did not affect our current liquidity, cash flows, borrowing capability or operations, nor did it impact the debt covenants under our credit agreement.

Restructuring charges. The Company incurred approximately $6.9 million in restructuring charges during the six months ended June 30, 2024, related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

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Adjusted EBITDA. Consolidated Adjusted EBITDA was $54.7 million for the six months ended June 30, 2024, a decrease of $5.8 million, or 9.6%, compared to $60.5 million for the six months ended June 30, 2023. Adjusted EBITDA margin was 10.1% for the six months ended June 30, 2024, compared to 11.9% for the six months ended June 30, 2023.

Net non-operating income. Net non-operating income was $10.3 million for the six months ended June 30, 2024, compared to $8.3 million for the six months ended June 30, 2023.

Interest, net, was $6.7 million of income for the six months ended June 30, 2024, compared to $5.2 million for the six months ended June 30, 2023, primarily due to higher interest rates on a higher volume of short-term investments.

Other, net, was $3.6 million of income for the six months ended June 30, 2024, compared to $3.2 million for the six months ended June 30, 2023. The income for the six months ended June 30, 2024, was primarily due to unrealized gains on the deferred compensation plan and foreign exchange gains. The income for the three months ended June 30, 2023, was primarily due to unrealized gains on the deferred compensation plan, partially offset by foreign exchange losses. The majority of the Company's investments, including those held in the Company’s deferred compensation plan, are recorded at fair value.

Income taxes. See Note 14, Income Taxes.

Executive Search

Americas

The Americas segment reported net revenue of $283.8 million for the six months ended June 30, 2024, an increase of 6.7% compared to $265.9 million for the six months ended June 30, 2023. The increase in net revenue was primarily due to a 5.7% increase in the number of executive search engagements. All practice groups exhibited growth over the prior period. Foreign exchange rate fluctuations positively impacted results by $0.1 million, or less than 0.1%. There were 216 Executive Search consultants in the Americas segment at June 30, 2024, compared to 219 at June 30, 2023.

Salaries and benefits expense increased $13.0 million, or 8.1%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. Fixed compensation decreased $0.6 million due to decreases in base salaries and payroll taxes, retirement and benefits costs, the deferred compensation plan, and separation costs, partially offset by increases in talent acquisition and retention costs, and stock compensation. Variable compensation increased $13.6 million due to higher bonus accruals related to increased consultant productivity.

General and administrative expenses increased $1.1 million, or 4.7%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in costs associated with the 2024 Global Partner Conference, professional fees, and information technology costs, partially offset by decreases in bad debt and costs related to the use of external third-party consultants.

Restructuring charges for the six months ended June 30, 2024, were $1.3 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

The Americas segment reported Adjusted EBITDA of $90.0 million for the six months ended June 30, 2024, an increase of $1.8 million compared to $88.2 million for the six months ended June 30, 2023. Adjusted EBITDA margin was 31.7% for the six months ended June 30, 2024, compared to 33.2% for the six months ended June 30, 2023.

Europe

The Europe segment reported net revenue of $81.6 million for the six months ended June 30, 2024, a decrease of 3.5% compared to $84.5 million for the six months ended June 30, 2023. The decrease in net revenue was primarily due to a 13.6% decrease in the number of executive search confirmations. The Life Sciences, Social Impact, and Global Technology & Services practice groups exhibited growth over the prior period. Foreign exchange rate fluctuations positively impacted results by $0.7 million, or 0.9%. There were 121 Executive Search consultants in the Europe segment at June 30, 2024, compared to 129 at June 30, 2023.

Salaries and benefits expense decreased $7.2 million, or 10.9%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. Fixed compensation decreased $5.3 million due to decreases in separation costs, talent

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acquisition and retention costs, retirement and benefit costs, and base salaries and payroll taxes, partially offset by an increase in stock compensation. Variable compensation decreased $1.9 million due to lower bonus accruals related to decreased consultant productivity.

General and administrative expense increased $2.6 million, or 18.8%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in office occupancy costs, bad debt, and business development travel, partially offset by decreases in professional fees and costs related to the use of external third-party consultants.

Impairment charges for the six months ended June 30, 2024, were $1.5 million as a result of an interim goodwill impairment evaluation. The impairment charge is recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024.

Restructuring charges for the six months ended June 30, 2024, were $0.9 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

The Europe segment reported Adjusted EBITDA of $6.2 million for the six months ended June 30, 2024, a decrease of $1.3 million compared to $7.5 million for the six months ended June 30, 2023. Adjusted EBITDA margin was 7.6% for the six months ended June 30, 2024, compared to 8.9% for the six months ended June 30, 2023.

Asia Pacific

The Asia Pacific segment reported net revenue of $46.1 million for the six months ended June 30, 2024, a decrease of 1.6% compared to $46.9 million for the six months ended June 30, 2023. The decrease in net revenue was primarily due to a 6.0% decrease in the number of executive search confirmations, partially offset by an increase in the average revenue per executive search. The Global Technology & Services, Life Sciences, and Financial Services practice groups exhibited growth over the prior year. Foreign exchange rate fluctuations negatively impacted results by $1.3 million, or 2.7%. There were 78 Executive Search consultants in the Asia Pacific segment at June 30, 2024, compared to 75 at June 30, 2023.

Salaries and benefits expense decreased $1.1 million, or 3.3%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. Fixed compensation increased $0.3 million due to increases in talent acquisition and retention costs, retirement and benefits costs, and stock compensation, partially offset by decreases in base salaries and payroll taxes, and separation costs. Variable compensation decreased $1.4 million due to lower bonus accruals related to decreased consultant productivity.

General and administrative expenses increased $0.4 million, or 5.0%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in business development travel, bad debt, and costs related to taxes and licenses, partially offset by decreases in office occupancy costs, professional fees, and hiring fees.

Restructuring charges for the three months ended June 30, 2024, were $0.2 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

The Asia Pacific segment reported Adjusted EBITDA of $4.9 million for the six months ended June 30, 2024, a decrease of $0.3 million compared to $5.2 million for the six months ended June 30, 2023. Adjusted EBITDA margin was 10.7% for the six months ended June 30, 2024, compared to 11.1% for the six months ended June 30, 2023.

On-Demand Talent

The On-Demand Talent segment reported net revenue of $79.8 million for the six months ended June 30, 2024, an increase of 13.4% compared to $70.4 million for the six months ended June 30, 2023. The increase in On-Demand Talent revenue was primarily due to an increase in the volume of On-Demand projects and the timing of the Atreus acquisition in February 2023. Foreign exchange rate fluctuations positively impacted results by $0.1 million, or 0.1%.

Salaries and benefits expense increased $3.4 million, or 14.7%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. Fixed compensation increased $1.0 million due to increases in base salaries and payroll taxes,

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talent acquisition and retention costs, and stock compensation, partially offset by decreases in separation costs, and retirement and benefits costs. Variable compensation increased $2.4 million due to higher bonus accruals related to increased productivity.

General and administrative expense increased $3.6 million, or 36.7%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in hiring fees, an adjustment to increase the earnout accrual for Atreus, office occupancy costs, and information technology costs, partially offset by decreases in intangible amortization, business development travel, and professional fees.

Cost of services increased $6.7 million, or 14.9%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, primarily due to an increase in the volume of On-Demand Talent projects.

During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024. Based on the results of the impairment evaluation of each of its reporting units, the Company recorded an impairment charge of $14.8 million in On-Demand Talent reporting unit. The impairment charge is recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024.

Restructuring charges for the six months ended June 30, 2024, were $0.3 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

The On-Demand Talent segment reported an Adjusted EBITDA loss of $2.6 million for the six months ended June 30, 2024, a decrease of $3.9 million compared to Adjusted EBITDA of $1.2 million for the six months ended June 30, 2023. Adjusted EBITDA margin was (3.2)% for the six months ended June 30, 2024, compared to 1.8% for the six months ended June 30, 2023.

Heidrick Consulting

The Heidrick Consulting segment reported net revenue of $52.6 million for the six months ended June 30, 2024, an increase of 22.6% compared to $42.9 million for the six months ended June 30, 2023. The increase in net revenue was primarily due to increases in leadership assessment and development consulting engagements compared to the prior year period. Foreign exchange rate fluctuations positively impacted results by $0.4 million, or 0.9%. There were 85 Heidrick Consulting consultants at June 30, 2024, compared to 89 at June 30, 2023.

Salaries and benefits expense increased $4.4 million, or 12.0%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. Fixed compensation increased $4.3 million due to increases in base salaries and payroll taxes, retirement and benefit costs, and separation costs, partially offset by decreases in stock compensation, and talent acquisition and retention costs. Variable compensation increased $0.1 million due to higher bonus accruals related to increased consultant productivity, partially offset by a decrease in headcount as a result of the workforce reduction.

General and administrative expenses increased $3.4 million, or 37.3%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in office occupancy costs, business development travel, intangible amortization, and an adjustment to increase the earnout accrual for businessfourzero, partially offset by a decrease in professional fees.

Cost of services increased $2.3 million, or 69.2%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to an increase in the volume of consulting projects requiring third-party consultants.

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During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023. Based on the results of the of the impairment evaluation, the Company recorded an impairment charge of $7.2 million in Heidrick Consulting to write-off all of the goodwill associated with that reporting unit. The impairment charge is recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2023, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2023.

Restructuring charges for the six months ended June 30, 2024, were $3.4 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

The Heidrick Consulting segment reported an Adjusted EBITDA loss of $3.4 million for the six months ended June 30, 2024, an improvement of $1.1 million compared to an Adjusted EBITDA loss of $4.5 million for the six months ended June 30, 2023. Adjusted EBITDA margin was (6.5)% for the three months ended June 30, 2024, compared to (10.4)% for the six months ended June 30, 2023.

Global Operations Support

Salaries and benefits expense increased $2.1 million, or 12.9%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in stock compensation, base salaries and payroll taxes, and retirement and benefits costs, partially offset by decreases in variable compensation and separation costs.

General and administrative expenses increased $1.9 million, or 17.6%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, due to increases in professional fees, information technology costs, marketing expenses, office occupancy costs, other operating expense, and business development travel, partially offset by decreases in insurance and bank fees, communication services costs, and hiring fees.

Restructuring charges for the six months ended June 30, 2024, were $1.0 million related to a workforce reduction. The charges are recorded within Restructuring charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the six months ended June 30, 2024.

Global Operations Support reported an Adjusted EBITDA loss of $30.8 million for the six months ended June 30, 2024, a decrease of $4.1 million compared to an Adjusted EBITDA loss of $26.7 million for the six months ended June 30, 2023. Adjusted EBITDA margin was (5.7)% for the six months ended June 30, 2024, compared to (5.2)% for the six months ended June 30, 2023.

Liquidity and Capital Resources

General. We continually evaluate our liquidity requirements, capital needs and availability of capital resources based on our operating needs. We believe that our available cash balances, funds expected to be generated from operations and funds available under our committed revolving credit facility will be sufficient to finance our operations for at least the next 12 months and the foreseeable future, as well as to finance the cash payments associated with our cash dividends and stock repurchase program.

We pay annual bonuses in the first half of the year following the year in which they are earned. Employee bonuses are accrued throughout the year and are based on our performance and the performance of the individual employee.

Lines of credit. On February 24, 2023, the Company entered into the Second Amendment (the “Second Amendment”) to the Credit Agreement, dated as of October 26, 2018 (the “Credit Agreement” and, as amended by the First Amendment to Credit Agreement, dated as of July 13, 2021, and the Second Amendment, the "Amended Credit Agreement") by and among the Company, Bank of America, N.A., as administrative agent, and the lenders party thereto. The Second Amendment changed the interest rate benchmark, from the London Interbank Offered Rate to the Secured Overnight Financing Rate (“SOFR”). At the Company's option, borrowings under the Amended Credit Agreement will bear interest at one-, three- or six-month term SOFR, or an alternate base rate as set forth in the Amended Credit Agreement, in each case plus an applicable margin. Additionally,

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the Amended Credit Agreement provides the Company with a committed unsecured revolving credit facility in an aggregate amount of $200 million, increased in the Second Amendment from $175 million as set forth in the original version of the Credit Agreement, which includes a sublimit of $25 million for letters of credit and a sublimit of $10 million for swingline loans, with a $75 million expansion feature. The Amended Credit Agreement matures on July 13, 2026.

Borrowings under the Amended Credit Agreement may be used for working capital, capital expenditures, permitted acquisitions, restricted payments and for other general corporate purposes of the Company and its subsidiaries. The obligations under the Amended Credit Agreement are guaranteed by certain of the Company’s subsidiaries.

As of June 30, 2024, and December 31, 2023, the Company had no outstanding borrowings. As of such dates, the Company was in compliance with the financial and other covenants under the Amended Credit Agreement and no event of default existed.

Cash, cash equivalents and marketable securities. Cash, cash equivalents and marketable securities at June 30, 2024, December 31, 2023, and June 30, 2023, were $296.9 million, $478.2 million and $239.0 million, respectively. The $296.9 million of cash, cash equivalents and marketable securities at June 30, 2024, includes $141.2 million held by our foreign subsidiaries. A portion of the $141.2 million is considered permanently reinvested in these foreign subsidiaries. If these funds were required to satisfy obligations in the U.S., the repatriation of these funds could cause us to incur additional U.S. income taxes or foreign withholding taxes.

Cash flows used in operating activities. Cash used in operating activities was $140.9 million for the six months ended June 30, 2024, primarily reflecting a decrease in accrued expenses of $124.7 million and an increase in accounts receivable of $55.8 million, partially offset by net income net of non-cash charges of $37.8 million. The decrease in accrued expenses is primarily due to cash bonus payments related to 2023 of $289.8 million, partially offset by 2024 bonus accruals.

Cash used in operating activities was $290.1 million for the six months ended June 30, 2023, primarily reflecting a decrease in accrued expenses of $273.8 million and an increase in accounts receivable of $60.0 million, partially offset by net income net of non-cash charges of $49.8 million. The decrease in accrued expenses is primarily due to cash bonus payments related to 2022 and prior year cash bonus deferrals of $422.0 million, partially offset by 2023 bonus accruals.

Cash flows provided by (used in) investing activities. Cash used in investing activities was $65.2 million for the six months ended June 30, 2024, primarily due to purchases of marketable securities and investments of $115.3 million, and capital expenditures of $16.5 million, partially offset by proceeds from the sale of marketable securities and investments of $66.6 million.

Cash provided by investing activities was $197.9 million for the six months ended June 30, 2023, due to proceeds from sales of marketable securities and investments of $268.1 million, partially offset by payments for the acquisitions of Atreus and businessfourzero of $35.7 million, purchases of marketable securities and investments of $27.7 million, and capital expenditures of $6.8 million.

Cash flows used in financing activities. Cash used in financing activities was $10.1 million for the six months ended June 30, 2024, consisting of dividend payments of $6.4 million and employee tax withholding payments on equity transactions of $3.7 million.

Cash used in financing activities was $47.2 million for the six months ended June 30, 2023, due to the Business Talent Group earnout payment of $35.9 million, dividend payments of $6.2 million, and employee tax withholding payments on equity transactions of $4.1 million.

Off-Balance Sheet Arrangements. We do not have material off-balance sheet arrangements, special purpose entities, trading activities of non-exchange traded contracts or transactions with related parties.

Contractual obligations. Our lease portfolio is comprised of operating leases for office space and equipment. As of June 30, 2024, we had aggregate future lease payment obligations of $96.2 million, with $18.0 million payable within 12 months. Associated with our lease portfolio, we have asset retirement obligations for the retirement of tangible long-lived assets related to our obligation at the end of the lease term to return office space to the landlord in its original condition. As of June 30, 2024, we had asset retirement obligations of $2.8 million, with $0.7 million payable within 12 months.

In addition to lease-related contractual obligations, we also have liabilities related to certain employee benefit plans. These liabilities are recorded in our Consolidated Balance Sheet at June 30, 2024. The obligations related to these employee benefit

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plans are described in Note 12, Employee Benefit Plans, and Note 13, Pension Plan and Life Insurance Contract, in the Company's Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024. As of June 30, 2024, we did not have a liability for uncertain tax positions.

Application of Critical Accounting Policies and Estimates

Management’s Discussion and Analysis of Financial Condition and Results of Operations is based upon our Condensed Consolidated Financial Statements, which have been prepared using accounting principles generally accepted in the United States of America. Our significant accounting policies are discussed in Note 2, Summary of Significant Accounting Policies, in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2023 as filed with the SEC on March 4, 2024, and in Note 2, Summary of Significant Accounting Policies, in the Notes to Condensed Consolidated Financial Statements included in Item 1 of this Quarterly Report on Form 10-Q. The preparation of these financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. If actual amounts are ultimately different from previous estimates, the revisions are included in our results of operations for the period in which the actual amounts become known.

An accounting policy is deemed to be critical if it requires an accounting estimate to be made based on assumptions about matters that are highly uncertain at the time the estimate is made, and if different estimates that reasonably could have been used, or if changes in the accounting estimates that are reasonably likely to occur periodically, could materially impact the financial statements. Management believes its critical accounting policies that reflect its more significant estimates and assumptions relate to revenue recognition, income taxes, interim effective tax rate and assessment of goodwill and other intangible assets for impairment. See Application of Critical Accounting Policies and Estimates in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024.

Recently Issued and Adopted Financial Accounting Standards

The information presented in Note 2, Summary of Significant Accounting Policies, to our Condensed Consolidated Financial Statements within this Quarterly Report on Form 10-Q is incorporated herein by reference.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Currency market risk. With our operations in the Americas, Europe, and Asia Pacific, we conduct business using various currencies. Revenue earned in each country is generally matched with the associated expenses incurred, thereby reducing currency risk to earnings. However, because certain assets and liabilities are denominated in currencies other than the U.S. dollar, changes in currency rates may cause fluctuations in the valuation of such assets and liabilities. As the local currency of our subsidiaries has generally been designated as the functional currency, we are affected by the translation of foreign currency financial statements into U.S. dollars. A 10% change in the average exchange rate for currencies of all foreign countries in which we operate would have increased or decreased our net income by approximately $0.3 million for the six months ended June 30, 2024. For financial information by segment, see Note 16, Segment Information, in the Notes to Condensed Consolidated Financial Statements within this Quarterly Report on Form 10-Q.

ITEM 4. CONTROLS AND PROCEDURES

 

(a)Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures as defined in the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Rules 13a-15(e) and 15d-15(e), that are designed to ensure that information required to be disclosed in the Company’s reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to the Company’s management, including its principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure. Any system of controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives.

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Management of the Company, with the participation of the principal executive officer and the principal financial officer, evaluated the effectiveness of the design and operation of the Company’s disclosure controls and procedures as of June 30, 2024. Based on the evaluation, the Company’s principal executive officer and principal financial officer concluded that the Company’s disclosure controls and procedures were effective as of June 30, 2024.

(b) Changes in Internal Control Over Financial Reporting

There were no changes to our internal control over financial reporting as defined in the Exchange Act Rules 13a-15(f) and 15d-15(f) that occurred during the three months ended June 30, 2024, that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The information presented in Note 18, Commitments and Contingencies, to our Condensed Consolidated Financial Statements is incorporated herein by reference.

Item 1A. Risk Factors

The business, financial condition and operating results of the Company can be affected by a number of factors, whether currently known or unknown, including but not limited to those described in Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2023, under the heading “Risk Factors,” any one or more of which could, directly or indirectly, cause the Company’s actual financial condition and operating results to vary materially from past, or from anticipated future, financial condition and operating results. Any of these factors, in whole or in part, could materially and adversely affect the Company’s business, financial condition, operating results and stock price. There have been no material changes to the Company’s risk factors from those set forth in the Company's Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024.

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Item 2. Unregistered Sales of Equity Securities, Use of Proceeds, and Issuer Purchases of Equity Securities

None.

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Item 6. Exhibits

Incorporated by Reference

Exhibit No.

Exhibit Description

Form

Exhibit

Filing Date/Period End Date

10.1

Fifth Amended and Restated Heidrick & Struggles 2012 GlobalShare Program**

S-8

4.4

5/23/2024

*31.1

Certification of the Company’s Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

*31.2

Certification of the Company’s Executive Vice President and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

†32.1

Certification of the Company’s Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

†32.2

Certification of the Company’s Executive Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

*101.INS

Inline XBRL Instance Document - the instance document does not appear in the Interactive Data Files because its XBRL tags are embedded within the Inline XBRL document

*101.SCH

Inline XBRL Taxonomy Extension Schema Document

*101.CAL

Inline XBRL Taxonomy Calculation Linkbase Document

*101.DEF

Inline XBRL Taxonomy Extension Definition Linkbase Document

*101.LAB

Inline XBRL Taxonomy Extension Label Linkbase Document

*101.PRE

Inline XBRL Taxonomy Extension Presentation Linkbase Document

*104

Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

*			Filed herewith.
**			Denotes a management contract or compensatory plan or arrangement.
†			Furnished herewith.

43

---

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: July 29, 2024

 

			Heidrick & Struggles International, Inc.
			(Registrant)
			/s/ Stephen A. Bondi
			Stephen A. Bondi
			Vice President, Controller (Duly authorized on behalf of the registrant and in his capacity as Chief Accounting Officer)

44

Exhibit 31.1

CERTIFICATION

I, Thomas L. Monahan, certify that:

 

1.    I have reviewed this quarterly report on Form 10-Q of Heidrick & Struggles International, Inc.;

2.    Based on my knowledge, this 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 report;

3.    Based on my knowledge, the financial statements, and other financial information included in this 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 report;

4.    The registrant’s other certifying officer 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 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 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 report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) 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 officer 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 the 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.

Dated:			July 29, 2024						/s/ Thomas L. Monahan III
									Thomas L. Monahan III
									Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, Mark R. Harris, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Heidrick & Struggles International, Inc.;

2.    Based on my knowledge, this 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 report;

3.    Based on my knowledge, the financial statements, and other financial information included in this 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 report;

4.    The registrant’s other certifying officer 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 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 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 report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) 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 officer 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 the 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.

Dated:			July 29, 2024						/s/ Mark R. Harris
									Mark R. Harris
									Executive Vice President and Chief Financial Officer

Exhibit 32.1

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Heidrick & Struggles International, Inc., a Delaware corporation (the “Company”), does hereby certify that:

The Quarterly Report on Form 10-Q for the quarter ended June 30, 2024 (the “Form 10-Q”) of the Company fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934 and the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:			July 29, 2024						/s/ Thomas L. Monahan III
									Thomas L. Monahan III
									Chief Executive Officer

Exhibit 32.2

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Heidrick & Struggles International, Inc., a Delaware corporation (the “Company”), does hereby certify that:

The Quarterly Report on Form 10-Q for the quarter ended June 30, 2024 (the “Form 10-Q”) of the Company fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934 and the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:			July 29, 2024						/s/ Mark R. Harris
									Mark R. Harris
									Executive Vice President and Chief Financial Officer

v3.24.2

Cover - shares	6 Months Ended
	Jun. 30, 2024	Jul. 26, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	0-25837
Entity Registrant Name	HEIDRICK & STRUGGLES INTERNATIONAL, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2681268
Entity Address, Address Line One	233 South Wacker Drive
Entity Address, Address Line Two	Suite 4900
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606-6303
City Area Code	(312)
Local Phone Number	496-1200
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	HSII
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,317,376
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001066605
Current Fiscal Year End Date	--12-31

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v3.24.2

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 189,922	$ 412,618
Marketable securities	106,963	65,538
Accounts receivable, net of allowances of $7,943 and $6,954, respectively	187,113	133,128
Prepaid expenses	28,016	23,597
Other current assets	43,745	47,923
Income taxes recoverable	7,660	10,410
Total current assets	563,419	693,214
Non-current assets
Property and equipment, net	48,434	35,752
Operating lease right-of-use assets	82,114	86,063
Assets designated for retirement and pension plans	10,779	11,105
Investments	55,927	47,287
Other non-current assets	26,875	17,071
Goodwill	183,150	202,252
Other intangible assets, net	16,411	20,842
Deferred income taxes	29,216	28,005
Total non-current assets	452,906	448,377
Total assets	1,016,325	1,141,591
Current liabilities
Accounts payable	19,515	20,837
Accrued salaries and benefits	190,225	322,744
Deferred revenue	44,679	45,732
Operating lease liabilities	18,044	21,498
Other current liabilities	25,693	21,823
Income taxes payable	8,593	6,057
Total current liabilities	306,749	438,691
Non-current liabilities
Accrued salaries and benefits	51,404	52,108
Retirement and pension plans	70,855	62,100
Operating lease liabilities	78,120	78,204
Other non-current liabilities	42,562	41,808
Deferred income taxes	5,703	6,402
Total non-current liabilities	248,644	240,622
Total liabilities	555,393	679,313
Commitments and contingencies (Note 18)
Stockholders’ equity
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued at June 30, 2024 and December 31, 2023	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized, 20,322,456 and 20,127,872 shares issued, 20,317,376 and 20,122,792 shares outstanding at June 30, 2024 and December 31, 2023, respectively	203	201
Treasury stock at cost, 5,080 shares at June 30, 2024 and December 31, 2023	(110)	(110)
Additional paid in capital	254,348	251,988
Retained earnings	212,547	210,070
Accumulated other comprehensive income (loss)	(6,056)	129
Total stockholders’ equity	460,932	462,278
Total liabilities and stockholders’ equity	$ 1,016,325	$ 1,141,591

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v3.24.2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss, current	$ 7,943	$ 6,954
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	20,322,456	20,127,872
Common stock, outstanding (in shares)	20,317,376	20,122,792
Treasury stock (in shares)	5,080	5,080

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v3.24.2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue
Revenue before reimbursements (net revenue)	$ 278,626	$ 271,225	$ 543,823	$ 510,542
Reimbursements	4,251	2,552	8,152	5,354
Total revenue	282,877	273,777	551,975	515,896
Operating expenses
Salaries and benefits	177,892	178,916	352,305	337,775
General and administrative expenses	46,453	40,514	87,816	74,841
Cost of services	29,696	25,306	57,128	48,138
Research and development	5,605	5,658	11,320	11,186
Impairment charges	16,224	7,246	16,224	7,246
Restructuring charges	6,939	0	6,939	0
Reimbursed expenses	4,251	2,552	8,152	5,354
Total operating expenses	287,060	260,192	539,884	484,540
Operating income (loss)	(4,183)	13,585	12,091	31,356
Non-operating income
Interest, net	2,612	1,913	6,698	5,162
Other, net	997	1,377	3,568	3,186
Net non-operating income	3,609	3,290	10,266	8,348
Income (loss) before income taxes	(574)	16,875	22,357	39,704
Provision for income taxes	4,583	7,893	13,482	15,136
Net income (loss)	(5,157)	8,982	8,875	24,568
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(2,103)	(88)	(6,161)	314
Net unrealized gain (loss) on available-for-sale investments	9	13	(24)	54
Other comprehensive income (loss), net of tax	(2,094)	(75)	(6,185)	368
Comprehensive income (loss)	$ (7,251)	$ 8,907	$ 2,690	$ 24,936
Weighted-average common shares outstanding
Basic (in shares)	20,259	20,010	20,202	19,958
Diluted (in shares)	20,259	20,637	21,061	20,701
Earnings (loss) per common share
Basic (in dollars per share)	$ (0.25)	$ 0.45	$ 0.44	$ 1.23
Diluted (in dollars per share)	(0.25)	0.44	0.42	1.19
Cash dividends paid per share (in dollars per share)	$ 0.15	$ 0.15	$ 0.30	$ 0.30

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v3.24.2

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2022		19,866,000
Beginning balance at Dec. 31, 2022	$ 410,646	$ 199	$ (191)	$ 246,630	$ 168,197	$ (4,189)
Treasury stock, beginning balance (in shares) at Dec. 31, 2022			5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,586				15,586
Other comprehensive income (loss), net of tax	443					443
Common and treasury stock transactions:
Stock-based compensation	1,853			1,853
Vesting of equity awards, net of tax withholding (in shares)		172,000
Vesting of equity awards, net of tax withholding	(4,141)	$ 1		(4,142)
Clawback of equity awards (in shares)			5,000
Clawback of equity awards	(163)		$ (163)
Cash dividends declared ($0.15 per share)	(3,006)				(3,006)
Dividend equivalents on restricted stock units	(106)				(106)
Ending balance (in shares) at Mar. 31, 2023		20,038,000
Ending balance at Mar. 31, 2023	421,112	$ 200	$ (354)	244,341	180,671	(3,746)
Treasury stock, ending balance (in shares) at Mar. 31, 2023			10,000
Beginning balance (in shares) at Dec. 31, 2022		19,866,000
Beginning balance at Dec. 31, 2022	410,646	$ 199	$ (191)	246,630	168,197	(4,189)
Treasury stock, beginning balance (in shares) at Dec. 31, 2022			5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,568
Other comprehensive income (loss), net of tax	$ 368
Common and treasury stock transactions:
Repurchase of common stock (in shares)	36,000
Repurchase of common stock	$ (900)
Ending balance (in shares) at Jun. 30, 2023		20,038,000
Ending balance at Jun. 30, 2023	428,317	$ 200	$ (819)	246,226	186,531	(3,821)
Treasury stock, ending balance (in shares) at Jun. 30, 2023			30,000
Beginning balance (in shares) at Mar. 31, 2023		20,038,000
Beginning balance at Mar. 31, 2023	421,112	$ 200	$ (354)	244,341	180,671	(3,746)
Treasury stock, beginning balance (in shares) at Mar. 31, 2023			10,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,982				8,982
Other comprehensive income (loss), net of tax	(75)					(75)
Common and treasury stock transactions:
Stock-based compensation	$ 1,919			1,919
Repurchase of common stock (in shares)	36,000		36,000
Repurchase of common stock	$ (904)		$ (904)
Re-issuance of treasury stock (in shares)			(16,000)
Re-issuance of treasury stock	405		$ 439	(34)
Cash dividends declared ($0.15 per share)	(3,003)				(3,003)
Dividend equivalents on restricted stock units	(119)				(119)
Ending balance (in shares) at Jun. 30, 2023		20,038,000
Ending balance at Jun. 30, 2023	$ 428,317	$ 200	$ (819)	246,226	186,531	(3,821)
Treasury stock, ending balance (in shares) at Jun. 30, 2023			30,000
Beginning balance (in shares) at Dec. 31, 2023	20,122,792	20,127,000
Beginning balance at Dec. 31, 2023	$ 462,278	$ 201	$ (110)	251,988	210,070	129
Treasury stock, beginning balance (in shares) at Dec. 31, 2023	5,080		5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 14,032				14,032
Other comprehensive income (loss), net of tax	(4,091)					(4,091)
Common and treasury stock transactions:
Stock-based compensation	2,644			2,644
Vesting of equity awards, net of tax withholding (in shares)		127,000
Vesting of equity awards, net of tax withholding	(2,862)	$ 1		(2,863)
Cash dividends declared ($0.15 per share)	(3,018)				(3,018)
Dividend equivalents on restricted stock units	(198)				(198)
Ending balance (in shares) at Mar. 31, 2024		20,254,000
Ending balance at Mar. 31, 2024	$ 468,785	$ 202	$ (110)	251,769	220,886	(3,962)
Treasury stock, ending balance (in shares) at Mar. 31, 2024			5,000
Beginning balance (in shares) at Dec. 31, 2023	20,122,792	20,127,000
Beginning balance at Dec. 31, 2023	$ 462,278	$ 201	$ (110)	251,988	210,070	129
Treasury stock, beginning balance (in shares) at Dec. 31, 2023	5,080		5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 8,875
Other comprehensive income (loss), net of tax	$ (6,185)
Common and treasury stock transactions:
Repurchase of common stock (in shares)	0
Ending balance (in shares) at Jun. 30, 2024	20,317,376	20,322,000
Ending balance at Jun. 30, 2024	$ 460,932	$ 203	$ (110)	254,348	212,547	(6,056)
Treasury stock, ending balance (in shares) at Jun. 30, 2024	5,080		5,000
Beginning balance (in shares) at Mar. 31, 2024		20,254,000
Beginning balance at Mar. 31, 2024	$ 468,785	$ 202	$ (110)	251,769	220,886	(3,962)
Treasury stock, beginning balance (in shares) at Mar. 31, 2024			5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(5,157)				(5,157)
Other comprehensive income (loss), net of tax	(2,094)					(2,094)
Common and treasury stock transactions:
Stock-based compensation	3,465			3,465
Issuance of common stock (in shares)		13,000
Vesting of equity awards, net of tax withholding (in shares)		55,000
Vesting of equity awards, net of tax withholding	$ (885)	$ 1		(886)
Repurchase of common stock (in shares)	0
Cash dividends declared ($0.15 per share)	$ (3,039)				(3,039)
Dividend equivalents on restricted stock units	$ (143)				(143)
Ending balance (in shares) at Jun. 30, 2024	20,317,376	20,322,000
Ending balance at Jun. 30, 2024	$ 460,932	$ 203	$ (110)	$ 254,348	$ 212,547	$ (6,056)
Treasury stock, ending balance (in shares) at Jun. 30, 2024	5,080		5,000

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v3.24.2

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.15	$ 0.15	$ 0.15	$ 0.15

X

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v3.24.2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows - operating activities
Net income	$ 8,875	$ 24,568
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	8,700	8,692
Deferred income taxes	(2,333)	6,446
Stock-based compensation expense	6,109	3,772
Accretion expense related to earnout payments	935	642
Gain on marketable securities	(980)	(1,694)
Loss on disposal of property and equipment	261	131
Impairment charges	16,224	7,246
Changes in assets and liabilities:
Accounts receivable	(55,842)	(59,990)
Accounts payable	(2,324)	(2,914)
Accrued expenses	(124,747)	(273,811)
Restructuring accrual	4,386	0
Deferred revenue	(673)	543
Income taxes recoverable and payable, net	5,368	(2,588)
Retirement and pension plan assets and liabilities	5,800	6,403
Prepaid expenses	(4,652)	(2,635)
Other assets and liabilities, net	(6,009)	(4,902)
Net cash used in operating activities	(140,902)	(290,091)
Cash flows - investing activities
Acquisition of businesses, net of cash acquired	0	(35,749)
Capital expenditures	(16,538)	(6,814)
Purchases of marketable securities and investments	(115,262)	(27,683)
Proceeds from sales of marketable securities and investments	66,574	268,118
Net cash provided by (used in) investing activities	(65,226)	197,872
Cash flows - financing activities
Repurchases of common stock	0	(904)
Cash dividends paid	(6,398)	(6,234)
Payment of employee tax withholdings on equity transactions	(3,747)	(4,141)
Acquisition earnout payments	0	(35,946)
Net cash used in financing activities	(10,145)	(47,225)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(6,423)	1,772
Net decrease in cash, cash equivalents and restricted cash	(222,696)	(137,672)
Cash, cash equivalents and restricted cash at beginning of period	412,618	355,489
Cash, cash equivalents and restricted cash at end of period	$ 189,922	$ 217,817

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- 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/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details Name: us-gaap_PaymentsToAcquireBusinessesGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.24.2

Basis of Presentation of Interim Financial Information	6 Months Ended
	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation of Interim Financial Information	Basis of Presentation of Interim Financial Information The accompanying unaudited Condensed Consolidated Financial Statements of Heidrick & Struggles International, Inc. and subsidiaries (the "Company") have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. Significant items subject to estimates and assumptions include revenue recognition, income taxes, interim effective tax rate and the assessment of goodwill, other intangible assets and long-lived assets for impairment. Estimates are subject to a degree of uncertainty and actual results could differ from these estimates. In the opinion of management, all adjustments necessary to fairly present the financial position of the Company at June 30, 2024 and December 31, 2023, the results of operations for the three and six months ended June 30, 2024 and 2023 and its cash flows for the six months ended June 30, 2024 and 2023 have been included and are of a normal, recurring nature except as otherwise disclosed. These financial statements and notes are to be read in conjunction with the Company’s Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024.

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- Definition The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480424/946-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480424/946-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/810/tableOfContent Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/205/tableOfContent + Details Name: us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies A complete listing of the Company’s significant accounting policies is discussed in Note 2, Summary of Significant Accounting Policies, in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Revenue Recognition See Note 3, Revenue. Cost of Services Cost of services consists of third-party contractor costs related to the delivery of various services in the Company's On-Demand Talent and Heidrick Consulting operating segments. Research and Development Research and development expense consists of payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development. Marketable Securities The Company’s marketable securities consist of available-for-sale debt securities with original maturities exceeding three months. Restricted Cash The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Cash Flows as of June 30, 2024, and 2023, and December 31, 2023, and 2022: June 30, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 189,922  $ 217,776  $ 412,618  $ 355,447  Restricted cash included within other non-current assets —  41  —  42  Total cash, cash equivalents and restricted cash $ 189,922  $ 217,817  $ 412,618  $ 355,489  Earnings (Loss) per Common Share Basic earnings (loss) per common share are computed by dividing net income (loss) by weighted average common shares outstanding for the period. Diluted earnings (loss) per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted. Common equivalent shares are excluded from the determination of diluted earnings (loss) per share in periods in which they have an anti-dilutive effect. The following table sets forth the computation of basic and diluted earnings (loss) per share: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Net income (loss) $ (5,157) $ 8,982  $ 8,875  $ 24,568  Weighted average shares outstanding: Basic 20,259  20,010  20,202  19,958  Effect of dilutive securities: Restricted stock units —  516  615  584  Performance stock units —  111  244  159  Diluted 20,259  20,637  21,061  20,701  Basic earnings (loss) per share $ (0.25) $ 0.45  $ 0.44  $ 1.23  Diluted earnings (loss) per share $ (0.25) $ 0.44  $ 0.42  $ 1.19  Weighted average restricted stock units and performance stock units outstanding that could be converted into approximately 474,000 and 132,000 common shares, respectively, for the three months ended June 30, 2024, were not included in the computation of diluted earnings (loss) per share because the effects would be anti-dilutive. Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets, Current liabilities - Operating lease liabilities and Non-current liabilities - Operating lease liabilities in the Company's Condensed Consolidated Balance Sheets. The Company does not have any leases that meet the finance lease criteria. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized on the commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, an incremental borrowing rate based on the information available at the commencement date is used in determining the present value of lease payments. The operating lease right-of-use asset also includes any lease payments made in advance and any accrued rent expense balances. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components. For office leases, the Company accounts for the lease and non-lease components as a single lease component. For equipment leases, such as vehicles and office equipment, the Company accounts for the lease and non-lease components separately. Goodwill Goodwill represents the difference between the purchase price of acquired businesses and the related fair value of the net assets acquired, which is accounted for by the acquisition method of accounting. The Company performs assessments of the carrying value of its goodwill at least annually and whenever events occur or circumstances indicate that a carrying amount of goodwill may not be recoverable. These circumstances include a significant change in business climate, attrition of key personnel, changes in financial condition or results of operations, prolonged decline in the Company’s stock price and market capitalization, competition, and other factors. The goodwill impairment test compares the fair value of a reporting unit to its carrying amount, including goodwill. The Company operates five reporting units: Americas, Europe (which includes Africa), Asia Pacific (which includes the Middle East), On-Demand Talent and Heidrick Consulting. The fair value of each of the Company’s reporting units is determined using a discounted cash flow methodology. An impairment charge is recognized for the amount by which the carrying value of the reporting unit exceeds its fair value; however, the loss recognized is not to exceed the total amount of goodwill allocated to that reporting unit. As a result of triggering events, the Company performed interim goodwill impairment evaluations during the three months ended June 30, 2024, and 2023, when the Company determined that it was more likely than not that the fair value of at least one of its reporting units was less than its respective carrying amount. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions to evaluate the impact of operating and macroeconomic changes on each reporting unit. During the impairment evaluation process, the Company used a discounted cash flow methodology to estimate the fair value of each of its reporting units. The discounted cash flow approach is dependent on a number of factors, including estimates of future market growth and trends, forecasted revenue and costs, capital investments, appropriate discount rates, certain assumptions to allocate shared costs, assets and liabilities, historical and projected performance of the reporting unit, and the macroeconomic conditions affecting each of the Company’s reporting units. The assumptions used in the determination of fair value were (1) a forecast of growth in the near and long term; (2) the discount rate; (3) working capital investments; (4) macroeconomic conditions; and (5) other factors. As part of the goodwill impairment evaluation, the Company performed a reconciliation of its market capitalization to the aggregated estimated fair value of all reporting units, including consideration of a control premium. Based on the results of the 2024 impairment evaluation, the Company determined that the goodwill within the On-Demand Talent and Europe reporting units were impaired, which resulted in impairment charges of $14.8 million and $1.5 million, respectively. Based on the results of the 2023 impairment evaluation, the Company determined that the goodwill within the Heidrick Consulting reporting unit was impaired, which resulted in an impairment charge of $7.2 million. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024, and 2023 and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023. The impairments were non-cash in nature and did not affect the Company's current liquidity, cash flows, borrowing capability or operations; nor did they impact the debt covenants under the Company's credit agreement. Recently Issued Financial Accounting Standards In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." The standard is intended to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance on its financial statements. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard is intended to improve reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit (referred to as the “significant expense principle”). This guidance is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company is currently evaluating the impact of this guidance on its financial statements. In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The guidance was intended to provide temporary optional expedients and exceptions to the guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates. This guidance is effective March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2024. The new guidance is not expected to have a material effect on the Company's financial statements.

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v3.24.2

Revenue	6 Months Ended
	Jun. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Executive Search Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Generally, each executive search contract contains one performance obligation which is the process of identifying potentially qualified candidates for a specific client position. In most contracts, the transaction price includes both fixed and variable consideration. Fixed compensation is comprised of a retainer, equal to approximately one-third of the estimated first year compensation for the position to be filled, and indirect expenses, equal to a specified percentage of the retainer, as defined in the contract. The Company generally bills clients for the retainer and indirect expenses in one-third increments over a three-month period commencing in the month of a client’s acceptance of the contract. If actual compensation of a placed candidate exceeds the original compensation estimate, the Company is often authorized to bill the client for one-third of the excess compensation. The Company refers to this additional billing as uptick revenue. In most contracts, variable consideration is comprised of uptick revenue and direct expenses. The Company bills its clients for uptick revenue upon completion of the executive search, and direct expenses are billed as incurred. The Company estimates uptick revenue at contract inception, based on a portfolio approach, utilizing the expected value method based on a historical analysis of uptick revenue realized in the Company’s geographic regions and industry practices, and initially records a contract’s uptick revenue in an amount that is probable not to result in a significant reversal of cumulative revenue recognized when the actual amount of uptick revenue for the contract is known. Differences between the estimated and actual amounts of variable consideration are recorded when known. The Company does not estimate revenue for direct expenses as it is not materially different than recognizing revenue as direct expenses are incurred. Revenue from executive search engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance.  Revenue from executive search engagements is recognized over the expected average period of performance, in proportion to the estimated personnel time incurred to fulfill the obligations under the executive search contract. Revenue is generally recognized over a period of approximately six months. The Company's executive search contracts contain a replacement guarantee which provides for an additional search to be completed, free of charge except for expense reimbursements, should the candidate presented by the Company be hired by the client and subsequently terminated by the client for performance reasons within a specified period of time. The replacement guarantee is an assurance warranty, which is not a performance obligation under the terms of the executive search contract, as the Company does not provide any services under the terms of the guarantee that transfer benefits to the client in excess of assuring that the identified candidate complies with the agreed-upon specifications. The Company accounts for the replacement guarantee under the relevant warranty guidance in Accounting Standards Codification 460 - Guarantees. On-Demand Talent The Company enters into contracts with clients that outline the general terms and conditions of the assignment to provide on-demand consultants for various types of consulting projects, which consultants may be independent contractors or temporary employees. The consideration the Company expects to receive under each contract is dependent on the time-based fees specified in the contract. Revenue from on-demand engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. The Company has applied the practical expedient to recognize revenue for these services in the amount to which the Company has a right to invoice the client, as this amount corresponds directly with the value provided to the client for the performance completed to date. For transactions where a third-party contractor is involved in providing the services to the client, the Company reports the revenue and the related direct costs on a gross basis as it has determined that it is the principal in the transaction. The Company is primarily responsible for fulfilling the promise to provide consulting services to its clients and the Company has discretion in establishing the prices charged to clients for the consulting services and is able to contractually obligate the independent service provider to deliver services and deliverables that the Company has agreed to provide to its clients. Heidrick Consulting Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Heidrick Consulting enters into contracts with clients that outline the general terms and conditions of the assignment to provide succession planning, executive assessment, top team and board effectiveness and culture shaping programs. The consideration the Company expects to receive under each contract is generally fixed. Most of the Company's consulting contracts contain one performance obligation, which is the overall process of providing the consulting service requested by the client. The majority of the Company's consulting revenue is recognized over time utilizing input methods. Revenue recognition over time for the majority of the Company's consulting engagements is measured by total cost or time incurred as a percentage of the total estimated cost or time on the consulting engagement. Contract Balances Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets and liabilities are classified as current due to the nature of the Company's contracts, which are completed within one year. Contract assets are included within Other current assets on the Condensed Consolidated Balance Sheets. Unbilled receivables: Unbilled receivables represents contract assets from revenue recognized over time in excess of the amount billed to the client and the amount billed to the client is solely dependent upon the passage of time. This amount includes revenue recognized in excess of billed Executive Search retainers, Heidrick Consulting fees, and On-Demand Talent fees. Contract assets: Contract assets represent revenue recognized over time in excess of the amount billed to the client, and the amount billed to the client is not solely subject to the passage of time. This amount primarily includes revenue recognized for upticks and contingent placement fees in executive search contracts. Deferred revenue: Contract liabilities consist of deferred revenue, which is equal to billings in excess of revenue recognized. The following table outlines the changes in the contract asset and liability balances from December 31, 2023, to June 30, 2024: June 30, 2024 December 31, 2023 Change Contract assets Unbilled receivables, net $ 19,878  $ 15,318  $ 4,560  Contract assets 16,112  16,774  (662) Total contract assets 35,990  32,092  3,898  Contract liabilities Deferred revenue $ 44,679  $ 45,732  $ (1,053) During the six months ended June 30, 2024, the Company recognized revenue of $36.2 million that was included in the contract liabilities balance at the beginning of the period. The amount of revenue recognized during the six months ended June 30, 2024, from performance obligations partially satisfied in previous periods as a result of changes in the estimates of variable consideration was $19.1 million. Each of the Company's contracts has an expected duration of one year or less. Accordingly, the Company has elected to utilize the available practical expedient related to the disclosure of the transaction price allocated to the remaining performance obligations under its contracts. The Company has also elected the available practical expedients related to adjusting for the effects of a significant financing component and the capitalization of contract acquisition costs. The Company charges and collects from its clients sales tax and value added taxes as required by certain jurisdictions. The Company has made an accounting policy election to exclude these items from the transaction price in its contracts.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org/606/tableOfContent + Details Name: us-gaap_RevenueFromContractWithCustomerTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Credit Losses	6 Months Ended
	Jun. 30, 2024
Credit Loss [Abstract]
Credit Losses	Credit Losses The Company is exposed to credit losses primarily through the provision of its executive search, consulting, and on-demand talent services. The Company’s expected credit loss allowance methodology for accounts receivable is developed using historical collection experience, current and future economic and market conditions and a review of the current status of clients' trade accounts receivables. Due to the short-term nature of such receivables, the estimate of the amount of accounts receivable that may not be collected is primarily based on historical loss-rate experience. When required, the Company adjusts the loss-rate methodology to account for current conditions and reasonable and supportable expectations of future economic and market conditions. The Company generally assesses future economic conditions for a period of sixty to ninety days, which corresponds with the contractual life of its accounts receivables. Additionally, specific allowance amounts are established to record the appropriate provision for clients that have a higher probability of default. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of clients' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible. The activity in the allowance for credit losses on the Company's trade receivables is as follows: Balance at December 31, 2023 $ 6,954  Provision for credit losses 3,674  Write-offs (3,051) Foreign currency translation 366  Balance at June 30, 2024 $ 7,943  There were no investments with unrealized losses at June 30, 2024, and December 31, 2023.

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- Definition The entire disclosure for claims held for amounts due to entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/310-10/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details Name: us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Property and Equipment, net	6 Months Ended
	Jun. 30, 2024
Property, Plant and Equipment [Abstract]
Property and Equipment, net	Property and Equipment, net The components of the Company’s property and equipment are as follows: June 30, 2024 December 31, 2023 Leasehold improvements $ 49,895  $ 45,050  Office furniture, fixtures and equipment 15,132  14,775  Computer equipment and software 43,024  38,798  Property and equipment, gross 108,051  98,623  Accumulated depreciation (59,617) (62,871) Property and equipment, net $ 48,434  $ 35,752  Depreciation expense for the three months ended June 30, 2024, and 2023, was $2.0 million and $2.2 million, respectively. Depreciation expense for the six months ending June 30, 2024, and 2023, was $4.5 million and $4.2 million, respectively.

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

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details Name: us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Leases	6 Months Ended
	Jun. 30, 2024
Leases [Abstract]
Leases	Leases The Company's lease portfolio is comprised of operating leases for office space and equipment. The majority of the Company's leases include both lease and non-lease components, which the Company accounts for differently depending on the underlying class of asset. Certain of the Company's leases include one or more options to renew or terminate the lease at the Company's discretion. Generally, the renewal and termination options are not included in the right-of-use assets and lease liabilities as they are not reasonably certain of exercise. The Company regularly evaluates the renewal and termination options and, when they are reasonably certain of exercise, includes the renewal or termination option in the lease term. As most of the Company's leases do not provide an implicit interest rate, the Company utilizes an incremental borrowing rate based on the information available at the commencement date of the lease in determining the present value of lease payments. The Company has a centrally managed treasury function and, therefore, a portfolio approach is applied in determining the incremental borrowing rate. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a fully collateralized basis over a similar term in an amount equal to the total lease payments in a similar economic environment. As of June 30, 2024, office leases have remaining lease terms that range from less than one year to 11.7 years, some of which also include options to extend or terminate the lease. Most office leases contain both fixed and variable lease payments. Variable lease costs consist primarily of rent escalations based on an established index or rate and taxes, insurance, and common area or other maintenance costs, which are paid based on actual costs incurred by the lessor. The Company has elected to utilize the available practical expedient to not separate lease and non-lease components for office leases. As of June 30, 2024, equipment leases, which are comprised of vehicle and office equipment leases, have remaining terms that range from less than one year to 4.7 years, some of which also include options to extend or terminate the lease. The Company's equipment leases do not contain variable lease payments. The Company separates the lease and non-lease components for its equipment leases. Equipment leases do not comprise a significant portion of the Company's lease portfolio. Lease cost components included within Operating expenses - General and administrative expenses in the Condensed Consolidated Statements of Comprehensive Income were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating lease cost $ 6,719  $ 4,567  $ 12,356  $ 9,092  Variable lease cost 2,570  $ 3,071  5,025  4,987  Total lease cost $ 9,289  $ 7,638  $ 17,381  $ 14,079  Supplemental cash flow information related to the Company's operating leases is as follows for the six months ended June 30: 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 11,807  $ 10,082  Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 7,447  $ 7,520  The weighted average remaining lease term and weighted average discount rate for operating leases as of June 30, are as follows: 2024 2023 Weighted Average Remaining Lease Term Operating leases 7.4 years 6.3 years Weighted Average Discount Rate Operating leases 5.01  % 3.79  % The future maturities of the Company's operating lease liabilities as of June 30, 2024, for the years ended December 31, are as follows: Operating Lease Maturity 2024 $ 11,098  2025 17,601  2026 16,018  2027 15,785  2028 12,296  Thereafter 47,313  Total lease payments 120,111  Less: Interest 23,947  Present value of lease liabilities $ 96,164

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/842-20/tableOfContent + Details Name: us-gaap_LesseeOperatingLeasesTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Financial Instruments and Fair Value	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value	Financial Instruments and Fair Value Cash, Cash Equivalents and Marketable Securities The Company's investments in marketable debt securities, which consist of U.S. Treasury bills, are classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument's underlying contractual maturity date. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in Accumulated other comprehensive income (loss) in the Condensed Consolidated Balance Sheets until realized. The Company's cash, cash equivalents, and marketable securities by significant investment category are as follows: Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at June 30, 2024 Cash $ 148,574  $ —  Level 1(1): Money market funds 18,686  —  U.S. Treasury securities $ 129,607  $ 18  $ 129,625  22,662  106,963  Total Level 1 129,607  18  129,625  41,348  106,963  Total $ 129,607  $ 18  $ 129,625  $ 189,922  $ 106,963  Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at December 31, 2023 Cash $ 221,980  $ —  Level 1(1): Money market funds 13,906  —  U.S. Treasury securities $ 242,228  $ 42  $ 242,270  176,732  65,538  Total Level 1 242,228  42  242,270  190,638  65,538  Total $ 242,228  $ 42  $ 242,270  $ 412,618  $ 65,538  (1)Level 1 – Quoted prices in active markets for identical assets and liabilities. Investments, Assets Designated for Retirement and Pension Plans and Associated Liabilities The Company has a U.S. non-qualified deferred compensation plan that consists primarily of U.S. marketable securities and mutual funds. The aggregate cost basis for these investments was $42.8 million and $37.2 million as of June 30, 2024, and December 31, 2023, respectively. The Company also maintains a pension plan for certain current and former employees in Germany. The pensions are individually fixed Euro amounts that vary depending on the function and the eligible years of service of the employee. The Company’s investment strategy is to support its pension obligations through reinsurance contracts. The BaFin—German Federal Financial Supervisory Authority—supervises the insurance companies and the reinsurance contracts. The BaFin requires each reinsurance contract to guarantee a fixed minimum return. The Company’s pension benefits are fully reinsured by group insurance contracts with ERGO Lebensversicherung AG, and the group insurance contracts are measured in accordance with BaFin guidelines (including mortality tables and discount rates) which are considered Level 2 inputs. The following tables provide a summary of the fair value measurements for each major category of investments, assets designated for retirement and pension plans and associated liabilities measured at fair value: Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at June 30, 2024 Measured on a recurring basis: Level 1(1): U.S. non-qualified deferred compensation plan $ 55,927  $ —  $ —  $ 55,927  $ —  $ —  Level 2(2): Retirement and pension plan assets 12,030  1,251  10,779  —  —  —  Pension benefit obligation (13,993) —  —  —  (1,251) (12,742) Total Level 2 (1,963) 1,251  10,779  —  (1,251) (12,742) Total $ 53,964  $ 1,251  $ 10,779  $ 55,927  $ (1,251) $ (12,742) Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at December 31, 2023 Measured on a recurring basis: Level 1(1): U.S. non-qualified deferred compensation plan $ 47,287  $ —  $ —  $ 47,287  $ —  $ —  Level 2(2): Retirement and pension plan assets 12,394  1,289  11,105  —  —  —  Pension benefit obligation (14,416) —  —  —  (1,289) (13,127) Total Level 2 (2,022) 1,289  11,105  —  (1,289) (13,127) Total $ 45,265  $ 1,289  $ 11,105  $ 47,287  $ (1,289) $ (13,127) (1)Level 1 – Quoted prices in active markets for identical assets and liabilities. (2)Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Contingent Consideration and Compensation The former owners of certain of the Company's acquired businesses are eligible to receive additional cash consideration based on the attainment of certain operating metrics in the periods subsequent to acquisition. Contingent consideration and compensation are valued using significant inputs that are not observable in the market, which are defined as Level 3 inputs pursuant to fair value measurement accounting. The Company determines the fair value of contingent consideration and compensation using a variation of the income approach, known as the real options method. The significant unobservable inputs utilized in the real options method include (1) revenue forecasts; (2) operating expense forecasts; (3) the discount rate; and (4) volatility. The following table provides a reconciliation of the beginning and ending balance of Level 3 liabilities for the six months ended June 30, 2024: Earnout Contingent Compensation Balance at December 31, 2023 $ (38,601) $ (18,878) Earnout accretion (935) —  Compensation expense —  (5,273) Fair value adjustment (1,211) —  Payments —  4,821  Foreign currency translation 1,047  990  Balance at June 30, 2024 $ (39,700) $ (18,340) Earnout accruals of $39.7 million and $38.6 million were recorded within Non-current liabilities - Other non-current liabilities as of June 30, 2024, and December 31, 2023, respectively. Contingent compensation accruals of $4.0 million and $6.0 million are recorded within Current liabilities - Accrued salaries and benefits as of June 30, 2024, and December 31, 2023, respectively, and contingent compensation accruals of $14.4 million and $12.9 million are recorded within Non-current liabilities - Accrued salaries and benefits as of June 30, 2024, and December 31, 2023, respectively. Goodwill Goodwill represents the difference between the purchase price of acquired businesses and the related fair value of the net assets acquired, which is accounted for by the acquisition method of accounting. The Company performs assessments of the carrying value of goodwill at least annually and whenever events occur or circumstances indicate that a carrying amount of goodwill may not be recoverable. During the three months ended June 30, 2024, an interim goodwill impairment evaluation was conducted to determine the fair value of the Company's reporting units. As a result of this evaluation, the Company recorded impairment charges in the On-Demand Talent and Europe reporting units of $14.8 million and $1.5 million, respectively. The fair value of the reporting units is valued using significant inputs that are not observable in the market which are defined as Level 3 inputs pursuant to fair value measurement accounting. The Company determines the fair value of its reporting units using discounted cash flow models. Other Investments The Company holds an equity investment that does not have a readily determinable fair value for which the Company uses the measurement alternative prescribed in FASB Accounting Standards Codification Topic 321, Investments-Equity Securities. As of June 30, 2024, the Company held equity investments under the measurement alternative of $11.0 million which are presented in Other non-current assets in the Condensed Consolidated Balance Sheets. There were no impairments or changes resulting from observable transactions for these investments in the three and six months ended June 30, 2024 and no adjustments have been made to the carrying values as of June 30, 2024. There were no equity investments as of December 31, 2023.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details Name: us-gaap_FairValueDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Acquisitions	6 Months Ended
	Jun. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions	Acquisitions On February 1, 2023, the Company acquired Atreus Group GmbH ("Atreus"), a leading provider of executive interim management in Germany. The Company paid $33.4 million in the first quarter of 2023, with a subsequent purchase price adjustment payment of $12.1 million in the fourth quarter of 2023. The former owners of Atreus are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $30.0 million and $40.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income milestones for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $32.0 million as of the acquisition date for the earnout liability. The Company recorded $11.3 million for customer relationships, $5.4 million for software, $2.5 million for a trade name and $62.4 million of goodwill. Goodwill is primarily related to the acquired workforce and strategic fit and is not deductible for tax purposes. On April 1, 2023, the Company acquired businessfourzero, a next generation consultancy specializing in developing and implementing purpose-driven change. In connection with the acquisition, the Company paid $9.5 million in the second quarter of 2023 with a subsequent purchase price adjustment payment of $2.2 million paid in the third quarter of 2023. The former owners of businessfourzero are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $4.0 million and $8.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income metrics for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $4.3 million as of the acquisition date for the earnout liability. The Company recorded $3.5 million for customer relationships, $0.5 million for a trade name, and $7.1 million of goodwill. The goodwill is primarily related to the acquired workforce and strategic fit.

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- 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/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 805 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/805/tableOfContent + Details Name: us-gaap_BusinessCombinationDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill The Company's goodwill by segment (for the segments that had recorded goodwill) is as follows: June 30, 2024 December 31, 2023 Executive Search Americas $ 91,191  $ 91,740  Europe 1,463  1,494  Total Executive Search 92,654  93,234  On-Demand Talent 106,720  109,018  Heidrick Consulting 7,246  7,246  Goodwill, gross 206,620  209,498  Accumulated impairment (23,470) (7,246) Total goodwill $ 183,150  $ 202,252  Changes in the carrying amount of goodwill by segment (for the segments that had recorded goodwill) for the six months ended June 30, 2024, are as follows: Executive Search On-Demand Talent Heidrick Consulting Americas Europe Total Goodwill $ 91,740  $ 1,494  $ 109,018  $ 7,246  $ 209,498  Accumulated impairment losses —  —  —  (7,246) (7,246) Balance at December 31, 2023 91,740  1,494  109,018  —  202,252  Impairment —  (1,463) (14,761) —  (16,224) Foreign currency translation (549) (31) (2,298) —  (2,878) Goodwill 91,191  1,463  106,720  7,246  206,620  Accumulated impairment losses —  (1,463) (14,761) (7,246) (23,470) Balance at June 30, 2024 $ 91,191  $ —  $ 91,959  $ —  $ 183,150  During the three months ended June 30, 2024, as a result of the Company's mid-year forecasting process, it was determined that a reduction in the On-Demand Talent reporting unit forecast was required. Due to the reduction in the forecasted results for the reporting unit, in addition to the 6% passing margin in the most recent impairment analysis conducted as of October 31, 2023, the Company determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2024. During the three months ended June 30, 2023, the Company acquired businessfourzero and recorded approximately $7.1 million of goodwill in the Heidrick Consulting reporting unit. Due to the inclusion of goodwill in a reporting unit with a pre-existing fair value shortfall, the Company evaluated the recent and anticipated future financial performance of the Heidrick Consulting reporting unit and determined that it was more likely than not that the fair value of the reporting unit was less than its carrying value. As a result, the Company identified a triggering event and performed an interim goodwill impairment evaluation during the three months ended June 30, 2023. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions to evaluate the impact of operating and macroeconomic changes on each reporting unit. During the impairment evaluation process, the Company used a discounted cash flow methodology to estimate the fair value of each of its reporting units. The discounted cash flow approach is dependent on a number of factors, including estimates of future market growth and trends, forecasted revenue and costs, capital investments, appropriate discount rates, certain assumptions to allocate shared costs, assets and liabilities, historical and projected performance of the reporting unit, and the macroeconomic conditions affecting each of the Company’s reporting units. The assumptions used in the determination of fair value were (1) a forecast of growth in the near and long term; (2) the discount rate; (3) working capital investments; (4) macroeconomic conditions; and (5) other factors. As part of the goodwill impairment evaluation, the Company performed a reconciliation of its market capitalization to the aggregated estimated fair value of all reporting units, including consideration of a control premium. Based on the results of the 2024 impairment evaluation, the Company determined that the goodwill within the On-Demand Talent and Europe reporting units were impaired, which resulted in impairment charges of $14.8 million and $1.5 million, respectively. Based on the results of the 2023 impairment evaluation, the Company determined that the goodwill within the Heidrick Consulting reporting unit was impaired, which resulted in an impairment charge of $7.2 million. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024, and 2023, and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023. The impairments were non-cash in nature and they did not affect the Company's current liquidity, cash flows, borrowing capability or operations; nor did it impact the debt covenants under the Company's credit agreement. Other Intangible Assets, net The Company’s other intangible assets, net by segment, are as follows: June 30, 2024 December 31, 2023 Executive Search Americas $ 11  $ 22  Europe 65  95  Total Executive Search 76  117  On-Demand Talent 13,931  17,689  Heidrick Consulting 2,404  3,036  Total other intangible assets, net $ 16,411  $ 20,842  The carrying amount of amortizable intangible assets and the related accumulated amortization are as follows:   Weighted Average Life (Years) June 30, 2024 December 31, 2023   Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships 10.2 $ 25,729  $ (13,532) $ 12,197  $ 26,195  $ (11,443) $ 14,752  Trade name 3.0 4,950  (3,563) 1,387  5,067  (3,069) 1,998  Software 3.0 8,467  (5,640) 2,827  8,629  (4,537) 4,092  Total intangible assets 8.4 $ 39,146  $ (22,735) $ 16,411  $ 39,891  $ (19,049) $ 20,842  Intangible asset amortization expense for the three months ended June 30, 2024, and 2023, was $1.9 million and $2.6 million, respectively. Intangible asset amortization expense for the six months ended June 30, 2024, and 2023, was $4.2 million and $4.5 million, respectively. The Company's estimated future amortization expense related to intangible assets as of June 30, 2024, for the following years ended December 31, is as follows: 2024 $ 3,620  2025 5,835  2026 2,476  2027 1,506  2028 882  Thereafter 2,092  Total $ 16,411

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v3.24.2

Other Current and Non-current Assets and Liabilities	6 Months Ended
	Jun. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current and Non-current Assets and Liabilities	Other Current and Non-current Assets and Liabilities The components of other current assets are as follows: June 30, 2024 December 31, 2023 Contract assets $ 35,990  $ 32,092  Other 7,755  15,831  Total other current assets $ 43,745  $ 47,923  The components of other non-current liabilities are as follows: June 30, 2024 December 31, 2023 Earnout liability $ 39,700  $ 38,601  Other 2,862  3,207  Total other non-current liabilities $ 42,562  $ 41,808
Other Current and Non-current Assets and Liabilities	Other Current and Non-current Assets and Liabilities The components of other current assets are as follows: June 30, 2024 December 31, 2023 Contract assets $ 35,990  $ 32,092  Other 7,755  15,831  Total other current assets $ 43,745  $ 47,923  The components of other non-current liabilities are as follows: June 30, 2024 December 31, 2023 Earnout liability $ 39,700  $ 38,601  Other 2,862  3,207  Total other non-current liabilities $ 42,562  $ 41,808

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 405 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/405/tableOfContent + Details Name: us-gaap_OtherLiabilitiesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Line of Credit	6 Months Ended
	Jun. 30, 2024
Debt Disclosure [Abstract]
Line of Credit	Line of Credit On February 24, 2023, the Company entered into the Second Amendment (the “Second Amendment”) to the Credit Agreement, dated as of October 26, 2018 (the “Credit Agreement” and, as amended by the First Amendment to Credit Agreement, dated as of July 13, 2021, and the Second Amendment, the "Amended Credit Agreement") by and among the Company, Bank of America, N.A., as administrative agent, and the lenders party thereto. The Second Amendment changed the interest rate benchmark, from LIBOR to the Secured Overnight Financing Rate (“SOFR”). At the Company's option, borrowings under the Amended Credit Agreement will bear interest at one-, three- or six-month term SOFR, or an alternate base rate as set forth in the Amended Credit Agreement, in each case plus an applicable margin. Additionally, the Amended Credit Agreement provides the Company with a committed unsecured revolving credit facility in an aggregate amount of $200 million, increased in the Second Amendment from $175 million as set forth in the original version of the Credit Agreement, which includes a sublimit of $25 million for letters of credit and a sublimit of $10 million for swingline loans, with a $75 million expansion feature. The Amended Credit Agreement matures on July 13, 2026. Borrowings under the Amended Credit Agreement may be used for working capital, capital expenditures, permitted acquisitions, restricted payments and for other general corporate purposes of the Company and its subsidiaries. The obligations under the Amended Credit Agreement are guaranteed by certain of the Company’s subsidiaries. As of June 30, 2024, and December 31, 2023, the Company had no outstanding borrowings. As of such dates, the Company was in compliance with the financial and other covenants under the Amended Credit Agreement and no event of default existed.

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- Definition The entire disclosure for 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: 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-Topic 405 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477092/405-40-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477092/405-40-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/470/tableOfContent Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (i) -Publisher FASB -URI 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v3.24.2

Stock-Based Compensation and Common Stock	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation and Common Stock	Stock-Based Compensation and Common Stock On May 23, 2024, the stockholders of the Company approved an amendment and restatement of the Company's Fourth Amended and Restated 2012 Heidrick & Struggles GlobalShare Program (as so amended, the "Fifth A&R Program") to increase the number of shares of common stock reserved for issuance under the plan by 649,000 shares, among other things. The Fifth A&R Program provides for grants of stock options, stock appreciation rights, restricted stock units, performance stock units, and other stock-based compensation awards that are valued based upon the grant date fair value of the awards. These awards may be granted to directors, selected employees and independent contractors. As of June 30, 2024, 4,744,660 awards have been issued under the Fifth A&R Program, including 792,136 forfeited awards, and 834,082 shares remain available for future awards assuming performance stock units vest at maximum levels. The Fifth A&R Program provides that no awards can be granted after the first annual meeting of the Company's stockholders to occur on or after May 23, 2034. The Company measures its stock-based compensation costs based on the grant date fair value of the awards and recognizes these costs over the requisite service period.      A summary of information with respect to stock-based compensation is as follows:   Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Salaries and benefits (1) $ 2,429  $ 806  $ 5,870  $ 3,403  General and administrative expenses 1,050  810  1,050  810  Income tax benefit related to stock-based compensation included in net income 958  445  1,907  1,160  (1) Includes $0.1 million of expense and $0.7 million of income related to cash-settled restricted stock units for the three months ended June 30, 2024, and 2023, respectively, and $0.9 million and $0.1 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2024, and 2023, respectively. Restricted Stock Units Restricted stock units granted to employees are subject to ratable vesting over a three-year or four-year period dependent upon the terms of the individual grant. Compensation expense related to service-based restricted stock units is recognized on a straight-line basis over the vesting period. Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fifth A&R Program as part of their annual compensation. Based on their respective elections, the Company issued 16,752 and 16,134 restricted stock units for services provided by the non-employee directors during the three months ended June 30, 2024, and 2023, respectively. Restricted stock units issued to non-employee directors remain unvested until the respective non-employee directors retire from the Board of Directors. Restricted stock unit activity for the six months ended June 30, 2024, is as follows: Number of Restricted Stock Units Weighted- Average Grant-Date Fair Value Outstanding on December 31, 2023 686,741  $ 30.33  Granted 292,447  33.42  Vested and converted to common stock (193,056) 33.08  Forfeited (7,091) 30.15  Outstanding on June 30, 2024 779,041  $ 30.81  As of June 30, 2024, there was $10.6 million of pre-tax unrecognized compensation expense related to unvested restricted stock units, which is expected to be recognized over a weighted average of 2.4 years. Performance Stock Units The Company grants performance stock units to certain of its senior executives. The majority of performance stock units are subject to cliff vesting at the end of a three-year period. The vesting will vary between 0% and 200% based on the attainment of certain performance and market conditions over the three-year vesting period. Half of the award is based on the achievement of adjusted operating margin or Adjusted EBITDA margin thresholds and half of the award is based on the Company's total shareholder return, relative to a peer group. The fair value of the awards subject to total shareholder return metrics is determined using the Monte Carlo simulation model. A Monte Carlo simulation model uses stock price volatility and other variables to estimate the probability of satisfying the performance conditions and the resulting fair value of the award. The performance stock units are expensed on a straight-line basis over the three-year vesting period. Certain of the Company's senior executives are granted performance stock units that are subject to ratable vesting over a four-year period. The vesting will vary between 0% and 100% of the shares subject to the performance stock units based on the attainment of specified stock price hurdles over the vesting period. The fair value of the awards subject to such stock price hurdles is determined using the Monte Carlo simulation model. The performance stock units are expensed on a straight-line basis over the derived service period, which ranges from one to four-years. Performance stock unit activity for the six months ended June 30, 2024, is as follows: Number of Performance Stock Units Weighted- Average Grant-Date Fair Value Outstanding on December 31, 2023 239,625  $ 41.91  Granted 273,536  32.64  Vested and converted to common stock (104,154) 44.18  Forfeited (720) 27.82  Outstanding on June 30, 2024 408,287  $ 35.14  As of June 30, 2024, there was $8.3 million of pre-tax unrecognized compensation expense related to unvested performance stock units, which is expected to be recognized over a weighted average of 2.6 years. Phantom Stock Units Phantom stock units are grants of phantom stock with respect to shares of the Company's common stock that are settled in cash and are subject to various restrictions, including restrictions on transferability, vesting and forfeiture provisions. Shares of phantom stock that do not vest for any reason will be forfeited by the recipient and will revert to the Company. Phantom stock units are subject to vesting over a three-year or four-year period, and such vesting is subject to certain other conditions, including continued service to the Company. As a result of the cash-settlement feature of the awards, the Company classifies the awards as liability awards, which are measured at fair value at each reporting date and the vested portion of the award is recognized as a liability to the extent that the service condition is deemed probable. The fair value of the phantom stock awards on the balance sheet date is determined using the closing share price of the Company's common stock on that date. The Company recorded phantom stock-based compensation expense of less than $0.1 million of expense and $0.7 million of income related to cash-settled restricted stock units for the three months ended June 30, 2024, and 2023, respectively, and $0.9 million and $0.1 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2024, and 2023, respectively. Phantom stock unit activity for the six months ended June 30, 2024, is as follows: Number of Phantom Stock Units Outstanding on December 31, 2023 187,301  Granted 33,247  Vested —  Forfeited —  Outstanding on June 30, 2024 220,548  As of June 30, 2024, there was $1.6 million of pre-tax unrecognized compensation expense related to unvested phantom stock units, which is expected to be recognized over a weighted average of 2.5 years. Common Stock Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fifth A&R Program as part of their annual compensation, which is typically issued in the second quarter each year. The Company issued 12,564 and 16,134 shares of common stock for services provided by the non-employee directors during the three months ended June 30, 2024, and 2023, respectively. On February 11, 2008, the Company's Board of Directors authorized management to repurchase shares of the Company's common stock with an aggregate purchase price of up to $50 million (the "Repurchase Authorization"). From time to time and as business conditions warrant, the Company may purchase shares of its common stock on the open market or in negotiated or block trades. No time limit has been set for completion of this program. There were no repurchases of common stock during the three or six months ended June 30, 2024. During the three and six months ended June 30, 2023, the Company purchased 36,000 shares of common stock for $0.9 million. Prior to 2023, the most recent purchase of the Company's shares of common stock occurred during the year ended December 31, 2012. As of June 30, 2024, the Company has purchased 1,074,670 shares of its common stock pursuant to the Repurchase Authorization for a total of $29.2 million and $20.8 million remains available for future purchases under the Repurchase Authorization.

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v3.24.2

Restructuring	6 Months Ended
	Jun. 30, 2024
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During the three months ended June 30, 2024, the Company implemented a restructuring plan (the "2024 Plan") to optimize future growth and profitability through a workforce reduction. Restructuring charges for the three and six months ended June 30, 2024, by type of charge and reportable segment are as follows: Executive Search Americas Europe Asia Pacific On-Demand Talent Heidrick Consulting Global Operations Support Total Employee related $ 1,277  $ 876  $ 157  $ 286  $ 3,367  $ 976  $ 6,939  Changes in the restructuring accrual for the six months ended June 30, 2024, were as follows: Accrual balance at December 31, 2023 —  Restructuring charges 6,939  Cash payments (2,570) Non-cash write-offs (6) Exchange rate fluctuations 23  Accrual balance at June 30, 2024 $ 4,386  Restructuring accruals are recorded within current Accrued salaries and benefits in the Consolidated Balance Sheets as of June 30, 2024.

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

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/420/tableOfContent Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Income Taxes	6 Months Ended
	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company reported loss before taxes of $0.6 million and an income tax provision of $4.6 million for the three months ended June 30, 2024. The Company reported income before taxes of $16.9 million and an income tax provision of $7.9 million for the three months ended June 30, 2023. The effective tax rates for the three months ended June 30, 2024, and 2023, were (798.4)% and 46.8%, respectively. The effective tax rate for the three months ended June 30, 2024, was impacted by the tax effect on goodwill impairment and the mix of income. The effective tax rate for the three months ended June 30, 2023, was impacted by the tax effect on goodwill impairment and the inability to recognize losses. The Company reported income before taxes of $22.4 million and an income tax provision of $13.5 million for the six months ended June 30, 2024. The Company reported income before taxes of $39.7 million and an income tax provision of $15.1 million for the six months ended June 30, 2023. The effective tax rates for the six months ended June 30, 2024, and 2023, were 60.3% and 38.1%, respectively. The effective tax rate for the six months ended June 30, 2024, was impacted by the tax effect on goodwill impairment and the mix of income. The effective tax rate for the six months ended June 30, 2023, was impacted by the tax effect on goodwill impairment and the inability to recognize losses.

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

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- Definition The entire disclosure for income tax. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12C -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 270 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477891/740-270-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.5.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-13 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/740/tableOfContent Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-14 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-21 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 17 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-17 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482603/740-30-50-2 + Details Name: us-gaap_IncomeTaxDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Changes in Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in Accumulated Other Comprehensive Income (Loss) The changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the six months ended June 30, 2024, are as follows: Available- for- Sale Securities Foreign Currency Translation Pension AOCI Balance at December 31, 2023 $ 42  $ 647  $ (560) $ 129  Other comprehensive loss before reclassification, net of tax (24) (6,161) —  (6,185) Balance at June 30, 2024 $ 18  $ (5,514) $ (560) $ (6,056)

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- 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/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details Name: us-gaap_ComprehensiveIncomeNoteTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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

v3.24.2

Segment Information	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has five operating segments. The Executive Search business operates in the Americas, Europe (which includes Africa) and Asia Pacific (which includes the Middle East), and the Heidrick Consulting and On-Demand Talent businesses operate globally. In 2023, the Company changed its measure of segment profitability from operating income to Adjusted EBITDA. The following tables include Adjusted EBITDA, which is the measure of segment profitability reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance. For segment purposes, reimbursements of out-of-pocket expenses classified as revenue and other operating income are reported separately and, therefore, are not included in the results of each segment. The Company believes that analyzing trends in revenue before reimbursements (net revenue), analyzing operating expenses as a percentage of net revenue, and analyzing Adjusted EBITDA and Adjusted EBITDA margin more appropriately reflect its core operations. The Company evaluates performance and allocates resources based on the chief operating decision maker’s review of (1) net revenue and (2) Adjusted EBITDA, which is defined as net income before interest, other income or expense, income taxes, depreciation and amortization, as adjusted, to the extent they occur, for earnout accretion, earnout fair value adjustments, contingent compensation, deferred compensation plan income or expense, certain reorganization costs, impairment charges and restructuring charges. Adjusted EBITDA margin is defined as Adjusted EBITDA as a percentage of revenue in the same period. Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Revenue before reimbursements (net revenue) $ 278,626  $ 271,225  $ 543,823  $ 510,542  Net income (loss) (5,157) 8,982  8,875  24,568  Interest, net (2,612) (1,913) (6,698) (5,162) Other, net (997) (1,377) (3,568) (3,186) Provision for income taxes 4,583  7,893  13,482  15,136  Operating income (loss) (4,183) 13,585  12,091  31,356  Adjustments Depreciation 1,990  2,172  4,483  4,176  Intangible amortization 1,920  2,647  4,217  4,516  Earnout accretion 469  451  935  642  Earnout fair value adjustments 1,211  —  1,211  —  Acquisition contingent consideration 3,285  3,784  5,273  5,443  Deferred compensation plan 956  1,603  3,306  3,736  Reorganization costs —  3,396  —  3,396  Impairment charges 16,224  7,246  16,224  7,246  Restructuring charges 6,939  —  6,939  —  Total adjustments 32,994  21,299  42,588  29,155  Adjusted EBITDA $ 28,811  $ 34,884  $ 54,679  $ 60,511  Adjusted EBITDA margin 10.3  % 12.9  % 10.1  % 11.9  % Revenue and Adjusted EBITDA by segment are as follows:   Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Revenue Executive Search Americas $ 147,078  $ 138,563  $ 283,757  $ 265,890  Europe 40,082  45,567  81,563  84,498  Asia Pacific 22,807  22,649  46,128  46,878  Total Executive Search 209,967  206,779  411,448  397,266  On-Demand Talent 41,895  39,240  79,752  70,357  Heidrick Consulting 26,764  25,206  52,623  42,919  Revenue before reimbursements (net revenue) 278,626  271,225  543,823  510,542  Reimbursements 4,251  2,552  8,152  5,354  Total revenue $ 282,877  $ 273,777  $ 551,975  $ 515,896    Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Adjusted EBITDA Executive Search Americas $ 48,112  $ 46,079  $ 89,983  $ 88,203  Europe 2,840  5,456  6,193  7,537  Asia Pacific 1,740  1,630  4,935  5,197  Total Executive Search 52,692  53,165  101,111  100,937  On-Demand Talent (1,629) 2,587  (2,550) 1,240  Heidrick Consulting (1,395) (1,662) (3,422) (4,457) Total segment operating income 49,668  54,090  95,139  97,720  Research and Development (4,781) (5,218) (9,706) (10,469) Global Operations Support (16,076) (13,988) (30,754) (26,740) Total Adjusted EBITDA $ 28,811  $ 34,884  $ 54,679  $ 60,511

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

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- 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/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 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v3.24.2

Guarantees	6 Months Ended
	Jun. 30, 2024
Guarantees and Product Warranties [Abstract]
Guarantees	Guarantees The Company has utilized letters of credit to support certain obligations, primarily for its office lease agreements. The letters of credit were made to secure the respective agreements and are for the terms of the agreements, which extend through 2033. For each letter of credit issued, the Company would have to use cash to fulfill the obligation if there is a default on a payment. The maximum amount of undiscounted payments the Company would be required to make in the event of default on all outstanding letters of credit is approximately $4.8 million as of June 30, 2024. The Company has not accrued for these arrangements as no event of default exists or is expected to exist.

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

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- Definition The entire disclosure for each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/460/tableOfContent Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details Name: us-gaap_GuaranteesTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company has contingent liabilities from various pending claims and litigation matters arising in the ordinary course of the Company’s business, some of which involve claims for damages that are substantial in amount. Some of these matters are covered in part by insurance. Based upon information currently available, the Company believes the ultimate resolution of such claims and litigation will not have a material adverse effect on its financial condition, results of operations or liquidity.

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

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 405 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/405-30/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/450/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478522/954-440-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 440 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/440/tableOfContent + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Cost of Services	Cost of Services Cost of services consists of third-party contractor costs related to the delivery of various services in the Company's On-Demand Talent and Heidrick Consulting operating segments.
Research and Development	Research and Development Research and development expense consists of payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development.
Marketable Securities	Marketable Securities The Company’s marketable securities consist of available-for-sale debt securities with original maturities exceeding three months.
Earnings (Loss) per Common Share	Earnings (Loss) per Common Share Basic earnings (loss) per common share are computed by dividing net income (loss) by weighted average common shares outstanding for the period. Diluted earnings (loss) per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted. Common equivalent shares are excluded from the determination of diluted earnings (loss) per share in periods in which they have an anti-dilutive effect.
Leases	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets, Current liabilities - Operating lease liabilities and Non-current liabilities - Operating lease liabilities in the Company's Condensed Consolidated Balance Sheets. The Company does not have any leases that meet the finance lease criteria. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized on the commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, an incremental borrowing rate based on the information available at the commencement date is used in determining the present value of lease payments. The operating lease right-of-use asset also includes any lease payments made in advance and any accrued rent expense balances. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components. For office leases, the Company accounts for the lease and non-lease components as a single lease component. For equipment leases, such as vehicles and office equipment, the Company accounts for the lease and non-lease components separately.
Goodwill	Goodwill Goodwill represents the difference between the purchase price of acquired businesses and the related fair value of the net assets acquired, which is accounted for by the acquisition method of accounting. The Company performs assessments of the carrying value of its goodwill at least annually and whenever events occur or circumstances indicate that a carrying amount of goodwill may not be recoverable. These circumstances include a significant change in business climate, attrition of key personnel, changes in financial condition or results of operations, prolonged decline in the Company’s stock price and market capitalization, competition, and other factors. The goodwill impairment test compares the fair value of a reporting unit to its carrying amount, including goodwill. The Company operates five reporting units: Americas, Europe (which includes Africa), Asia Pacific (which includes the Middle East), On-Demand Talent and Heidrick Consulting. The fair value of each of the Company’s reporting units is determined using a discounted cash flow methodology. An impairment charge is recognized for the amount by which the carrying value of the reporting unit exceeds its fair value; however, the loss recognized is not to exceed the total amount of goodwill allocated to that reporting unit. As a result of triggering events, the Company performed interim goodwill impairment evaluations during the three months ended June 30, 2024, and 2023, when the Company determined that it was more likely than not that the fair value of at least one of its reporting units was less than its respective carrying amount. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions to evaluate the impact of operating and macroeconomic changes on each reporting unit. During the impairment evaluation process, the Company used a discounted cash flow methodology to estimate the fair value of each of its reporting units. The discounted cash flow approach is dependent on a number of factors, including estimates of future market growth and trends, forecasted revenue and costs, capital investments, appropriate discount rates, certain assumptions to allocate shared costs, assets and liabilities, historical and projected performance of the reporting unit, and the macroeconomic conditions affecting each of the Company’s reporting units. The assumptions used in the determination of fair value were (1) a forecast of growth in the near and long term; (2) the discount rate; (3) working capital investments; (4) macroeconomic conditions; and (5) other factors. As part of the goodwill impairment evaluation, the Company performed a reconciliation of its market capitalization to the aggregated estimated fair value of all reporting units, including consideration of a control premium. Based on the results of the 2024 impairment evaluation, the Company determined that the goodwill within the On-Demand Talent and Europe reporting units were impaired, which resulted in impairment charges of $14.8 million and $1.5 million, respectively. Based on the results of the 2023 impairment evaluation, the Company determined that the goodwill within the Heidrick Consulting reporting unit was impaired, which resulted in an impairment charge of $7.2 million. The impairment charges are recorded within Impairment charges in the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2024, and 2023 and the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2024, and 2023. The impairments were non-cash in nature and did not affect the Company's current liquidity, cash flows, borrowing capability or operations; nor did they impact the debt covenants under the Company's credit agreement.
Recently Issued Financial Accounting Standards	Recently Issued Financial Accounting Standards In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." The standard is intended to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance on its financial statements. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard is intended to improve reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit (referred to as the “significant expense principle”). This guidance is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company is currently evaluating the impact of this guidance on its financial statements. In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The guidance was intended to provide temporary optional expedients and exceptions to the guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates. This guidance is effective March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2024. The new guidance is not expected to have a material effect on the Company's financial statements.
Revenue Recognition	Executive Search Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Generally, each executive search contract contains one performance obligation which is the process of identifying potentially qualified candidates for a specific client position. In most contracts, the transaction price includes both fixed and variable consideration. Fixed compensation is comprised of a retainer, equal to approximately one-third of the estimated first year compensation for the position to be filled, and indirect expenses, equal to a specified percentage of the retainer, as defined in the contract. The Company generally bills clients for the retainer and indirect expenses in one-third increments over a three-month period commencing in the month of a client’s acceptance of the contract. If actual compensation of a placed candidate exceeds the original compensation estimate, the Company is often authorized to bill the client for one-third of the excess compensation. The Company refers to this additional billing as uptick revenue. In most contracts, variable consideration is comprised of uptick revenue and direct expenses. The Company bills its clients for uptick revenue upon completion of the executive search, and direct expenses are billed as incurred. The Company estimates uptick revenue at contract inception, based on a portfolio approach, utilizing the expected value method based on a historical analysis of uptick revenue realized in the Company’s geographic regions and industry practices, and initially records a contract’s uptick revenue in an amount that is probable not to result in a significant reversal of cumulative revenue recognized when the actual amount of uptick revenue for the contract is known. Differences between the estimated and actual amounts of variable consideration are recorded when known. The Company does not estimate revenue for direct expenses as it is not materially different than recognizing revenue as direct expenses are incurred. Revenue from executive search engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance.  Revenue from executive search engagements is recognized over the expected average period of performance, in proportion to the estimated personnel time incurred to fulfill the obligations under the executive search contract. Revenue is generally recognized over a period of approximately six months. The Company's executive search contracts contain a replacement guarantee which provides for an additional search to be completed, free of charge except for expense reimbursements, should the candidate presented by the Company be hired by the client and subsequently terminated by the client for performance reasons within a specified period of time. The replacement guarantee is an assurance warranty, which is not a performance obligation under the terms of the executive search contract, as the Company does not provide any services under the terms of the guarantee that transfer benefits to the client in excess of assuring that the identified candidate complies with the agreed-upon specifications. The Company accounts for the replacement guarantee under the relevant warranty guidance in Accounting Standards Codification 460 - Guarantees. On-Demand Talent The Company enters into contracts with clients that outline the general terms and conditions of the assignment to provide on-demand consultants for various types of consulting projects, which consultants may be independent contractors or temporary employees. The consideration the Company expects to receive under each contract is dependent on the time-based fees specified in the contract. Revenue from on-demand engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. The Company has applied the practical expedient to recognize revenue for these services in the amount to which the Company has a right to invoice the client, as this amount corresponds directly with the value provided to the client for the performance completed to date. For transactions where a third-party contractor is involved in providing the services to the client, the Company reports the revenue and the related direct costs on a gross basis as it has determined that it is the principal in the transaction. The Company is primarily responsible for fulfilling the promise to provide consulting services to its clients and the Company has discretion in establishing the prices charged to clients for the consulting services and is able to contractually obligate the independent service provider to deliver services and deliverables that the Company has agreed to provide to its clients. Heidrick Consulting Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Heidrick Consulting enters into contracts with clients that outline the general terms and conditions of the assignment to provide succession planning, executive assessment, top team and board effectiveness and culture shaping programs. The consideration the Company expects to receive under each contract is generally fixed. Most of the Company's consulting contracts contain one performance obligation, which is the overall process of providing the consulting service requested by the client. The majority of the Company's consulting revenue is recognized over time utilizing input methods. Revenue recognition over time for the majority of the Company's consulting engagements is measured by total cost or time incurred as a percentage of the total estimated cost or time on the consulting engagement. Contract Balances Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets and liabilities are classified as current due to the nature of the Company's contracts, which are completed within one year. Contract assets are included within Other current assets on the Condensed Consolidated Balance Sheets. Unbilled receivables: Unbilled receivables represents contract assets from revenue recognized over time in excess of the amount billed to the client and the amount billed to the client is solely dependent upon the passage of time. This amount includes revenue recognized in excess of billed Executive Search retainers, Heidrick Consulting fees, and On-Demand Talent fees. Contract assets: Contract assets represent revenue recognized over time in excess of the amount billed to the client, and the amount billed to the client is not solely subject to the passage of time. This amount primarily includes revenue recognized for upticks and contingent placement fees in executive search contracts. Deferred revenue: Contract liabilities consist of deferred revenue, which is equal to billings in excess of revenue recognized.

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- 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/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 + Details Name: us-gaap_EarningsPerSharePolicyTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of accounting policy for goodwill. This accounting policy also may address how an entity assesses and measures impairment of goodwill, how reporting units are determined, how goodwill is allocated to such units, and how the fair values of the reporting units are determined. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details Name: us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- 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/disclosureRef -Topic 730 -SubTopic 10 -Name Accounting Standards Codification -Section 05 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483044/730-10-05-1 + Details Name: us-gaap_ResearchAndDevelopmentExpensePolicy Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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v3.24.2

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Cash Flows as of June 30, 2024, and 2023, and December 31, 2023, and 2022: June 30, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 189,922  $ 217,776  $ 412,618  $ 355,447  Restricted cash included within other non-current assets —  41  —  42  Total cash, cash equivalents and restricted cash $ 189,922  $ 217,817  $ 412,618  $ 355,489
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings (loss) per share: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Net income (loss) $ (5,157) $ 8,982  $ 8,875  $ 24,568  Weighted average shares outstanding: Basic 20,259  20,010  20,202  19,958  Effect of dilutive securities: Restricted stock units —  516  615  584  Performance stock units —  111  244  159  Diluted 20,259  20,637  21,061  20,701  Basic earnings (loss) per share $ (0.25) $ 0.45  $ 0.44  $ 1.23  Diluted earnings (loss) per share $ (0.25) $ 0.44  $ 0.42  $ 1.19

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v3.24.2

Revenue (Tables)	6 Months Ended
	Jun. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Changes in Contract Asset and Liability	The following table outlines the changes in the contract asset and liability balances from December 31, 2023, to June 30, 2024: June 30, 2024 December 31, 2023 Change Contract assets Unbilled receivables, net $ 19,878  $ 15,318  $ 4,560  Contract assets 16,112  16,774  (662) Total contract assets 35,990  32,092  3,898  Contract liabilities Deferred revenue $ 44,679  $ 45,732  $ (1,053)

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v3.24.2

Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2024
Credit Loss [Abstract]
Schedule of Accounts Receivable, Allowance for Credit Loss	The activity in the allowance for credit losses on the Company's trade receivables is as follows: Balance at December 31, 2023 $ 6,954  Provision for credit losses 3,674  Write-offs (3,051) Foreign currency translation 366  Balance at June 30, 2024 $ 7,943

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details Name: us-gaap_AccountsReceivableAllowanceForCreditLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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v3.24.2

Property and Equipment, net (Tables)	6 Months Ended
	Jun. 30, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	The components of the Company’s property and equipment are as follows: June 30, 2024 December 31, 2023 Leasehold improvements $ 49,895  $ 45,050  Office furniture, fixtures and equipment 15,132  14,775  Computer equipment and software 43,024  38,798  Property and equipment, gross 108,051  98,623  Accumulated depreciation (59,617) (62,871) Property and equipment, net $ 48,434  $ 35,752

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details Name: us-gaap_PropertyPlantAndEquipmentTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Leases (Tables)	6 Months Ended
	Jun. 30, 2024
Leases [Abstract]
Schedule of Lease Cost	Lease cost components included within Operating expenses - General and administrative expenses in the Condensed Consolidated Statements of Comprehensive Income were as follows: Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Operating lease cost $ 6,719  $ 4,567  $ 12,356  $ 9,092  Variable lease cost 2,570  $ 3,071  5,025  4,987  Total lease cost $ 9,289  $ 7,638  $ 17,381  $ 14,079  Supplemental cash flow information related to the Company's operating leases is as follows for the six months ended June 30: 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 11,807  $ 10,082  Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 7,447  $ 7,520
Schedule of Weighted Average Information Related to Leases	The weighted average remaining lease term and weighted average discount rate for operating leases as of June 30, are as follows: 2024 2023 Weighted Average Remaining Lease Term Operating leases 7.4 years 6.3 years Weighted Average Discount Rate Operating leases 5.01  % 3.79  %
Schedule of Future Maturities for Operating Leases	The future maturities of the Company's operating lease liabilities as of June 30, 2024, for the years ended December 31, are as follows: Operating Lease Maturity 2024 $ 11,098  2025 17,601  2026 16,018  2027 15,785  2028 12,296  Thereafter 47,313  Total lease payments 120,111  Less: Interest 23,947  Present value of lease liabilities $ 96,164

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v3.24.2

Financial Instruments and Fair Value (Tables)	6 Months Ended
	Jun. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Unrealized Gain (Loss) on Investments	The Company's cash, cash equivalents, and marketable securities by significant investment category are as follows: Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at June 30, 2024 Cash $ 148,574  $ —  Level 1(1): Money market funds 18,686  —  U.S. Treasury securities $ 129,607  $ 18  $ 129,625  22,662  106,963  Total Level 1 129,607  18  129,625  41,348  106,963  Total $ 129,607  $ 18  $ 129,625  $ 189,922  $ 106,963  Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at December 31, 2023 Cash $ 221,980  $ —  Level 1(1): Money market funds 13,906  —  U.S. Treasury securities $ 242,228  $ 42  $ 242,270  176,732  65,538  Total Level 1 242,228  42  242,270  190,638  65,538  Total $ 242,228  $ 42  $ 242,270  $ 412,618  $ 65,538  (1)Level 1 – Quoted prices in active markets for identical assets and liabilities.
Schedule of Fair Value, Separate Account Investment	The following tables provide a summary of the fair value measurements for each major category of investments, assets designated for retirement and pension plans and associated liabilities measured at fair value: Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at June 30, 2024 Measured on a recurring basis: Level 1(1): U.S. non-qualified deferred compensation plan $ 55,927  $ —  $ —  $ 55,927  $ —  $ —  Level 2(2): Retirement and pension plan assets 12,030  1,251  10,779  —  —  —  Pension benefit obligation (13,993) —  —  —  (1,251) (12,742) Total Level 2 (1,963) 1,251  10,779  —  (1,251) (12,742) Total $ 53,964  $ 1,251  $ 10,779  $ 55,927  $ (1,251) $ (12,742) Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at December 31, 2023 Measured on a recurring basis: Level 1(1): U.S. non-qualified deferred compensation plan $ 47,287  $ —  $ —  $ 47,287  $ —  $ —  Level 2(2): Retirement and pension plan assets 12,394  1,289  11,105  —  —  —  Pension benefit obligation (14,416) —  —  —  (1,289) (13,127) Total Level 2 (2,022) 1,289  11,105  —  (1,289) (13,127) Total $ 45,265  $ 1,289  $ 11,105  $ 47,287  $ (1,289) $ (13,127) (1)Level 1 – Quoted prices in active markets for identical assets and liabilities. (2)Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
Schedule of Reconciliation of Level 3 Assets and Liabilities	The following table provides a reconciliation of the beginning and ending balance of Level 3 liabilities for the six months ended June 30, 2024: Earnout Contingent Compensation Balance at December 31, 2023 $ (38,601) $ (18,878) Earnout accretion (935) —  Compensation expense —  (5,273) Fair value adjustment (1,211) —  Payments —  4,821  Foreign currency translation 1,047  990  Balance at June 30, 2024 $ (39,700) $ (18,340)

X

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

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details Name: us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details Name: us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill by Segment	The Company's goodwill by segment (for the segments that had recorded goodwill) is as follows: June 30, 2024 December 31, 2023 Executive Search Americas $ 91,191  $ 91,740  Europe 1,463  1,494  Total Executive Search 92,654  93,234  On-Demand Talent 106,720  109,018  Heidrick Consulting 7,246  7,246  Goodwill, gross 206,620  209,498  Accumulated impairment (23,470) (7,246) Total goodwill $ 183,150  $ 202,252
Schedule of Changes in Carrying Amount of Goodwill by Segment	Changes in the carrying amount of goodwill by segment (for the segments that had recorded goodwill) for the six months ended June 30, 2024, are as follows: Executive Search On-Demand Talent Heidrick Consulting Americas Europe Total Goodwill $ 91,740  $ 1,494  $ 109,018  $ 7,246  $ 209,498  Accumulated impairment losses —  —  —  (7,246) (7,246) Balance at December 31, 2023 91,740  1,494  109,018  —  202,252  Impairment —  (1,463) (14,761) —  (16,224) Foreign currency translation (549) (31) (2,298) —  (2,878) Goodwill 91,191  1,463  106,720  7,246  206,620  Accumulated impairment losses —  (1,463) (14,761) (7,246) (23,470) Balance at June 30, 2024 $ 91,191  $ —  $ 91,959  $ —  $ 183,150
Schedule of Indefinite-Lived Intangible Assets	The Company’s other intangible assets, net by segment, are as follows: June 30, 2024 December 31, 2023 Executive Search Americas $ 11  $ 22  Europe 65  95  Total Executive Search 76  117  On-Demand Talent 13,931  17,689  Heidrick Consulting 2,404  3,036  Total other intangible assets, net $ 16,411  $ 20,842
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	The carrying amount of amortizable intangible assets and the related accumulated amortization are as follows:   Weighted Average Life (Years) June 30, 2024 December 31, 2023   Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships 10.2 $ 25,729  $ (13,532) $ 12,197  $ 26,195  $ (11,443) $ 14,752  Trade name 3.0 4,950  (3,563) 1,387  5,067  (3,069) 1,998  Software 3.0 8,467  (5,640) 2,827  8,629  (4,537) 4,092  Total intangible assets 8.4 $ 39,146  $ (22,735) $ 16,411  $ 39,891  $ (19,049) $ 20,842
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The Company's estimated future amortization expense related to intangible assets as of June 30, 2024, for the following years ended December 31, is as follows: 2024 $ 3,620  2025 5,835  2026 2,476  2027 1,506  2028 882  Thereafter 2,092  Total $ 16,411

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 + Details Name: us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- 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/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 + Details Name: us-gaap_ScheduleOfGoodwillTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance and exist in perpetuity, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details Name: us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details Name: us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- 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/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details Name: us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Other Current and Non-current Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	The components of other current assets are as follows: June 30, 2024 December 31, 2023 Contract assets $ 35,990  $ 32,092  Other 7,755  15,831  Total other current assets $ 43,745  $ 47,923
Schedule of Other Noncurrent Liabilities	The components of other non-current liabilities are as follows: June 30, 2024 December 31, 2023 Earnout liability $ 39,700  $ 38,601  Other 2,862  3,207  Total other non-current liabilities $ 42,562  $ 41,808

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

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details Name: us-gaap_OtherNoncurrentLiabilitiesTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the carrying amounts of other current assets. + References No definition available. + Details Name: us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Stock-Based Compensation and Common Stock (Tables)	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount	A summary of information with respect to stock-based compensation is as follows:   Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Salaries and benefits (1) $ 2,429  $ 806  $ 5,870  $ 3,403  General and administrative expenses 1,050  810  1,050  810  Income tax benefit related to stock-based compensation included in net income 958  445  1,907  1,160  (1) Includes $0.1 million of expense and $0.7 million of income related to cash-settled restricted stock units for the three months ended June 30, 2024, and 2023, respectively, and $0.9 million and $0.1 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2024, and 2023, respectively.
Schedule of Share-based Payment Arrangement, Restricted Stock Unit, Activity	Restricted stock unit activity for the six months ended June 30, 2024, is as follows: Number of Restricted Stock Units Weighted- Average Grant-Date Fair Value Outstanding on December 31, 2023 686,741  $ 30.33  Granted 292,447  33.42  Vested and converted to common stock (193,056) 33.08  Forfeited (7,091) 30.15  Outstanding on June 30, 2024 779,041  $ 30.81
Schedule of Performance Stock Unit Activity	Performance stock unit activity for the six months ended June 30, 2024, is as follows: Number of Performance Stock Units Weighted- Average Grant-Date Fair Value Outstanding on December 31, 2023 239,625  $ 41.91  Granted 273,536  32.64  Vested and converted to common stock (104,154) 44.18  Forfeited (720) 27.82  Outstanding on June 30, 2024 408,287  $ 35.14
Schedule of Share-Based Compensation, Phantom Shares Award Outstanding Activity	Phantom stock unit activity for the six months ended June 30, 2024, is as follows: Number of Phantom Stock Units Outstanding on December 31, 2023 187,301  Granted 33,247  Vested —  Forfeited —  Outstanding on June 30, 2024 220,548

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ScheduleOfNonvestedPerformanceBasedUnitsActivityTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges Reportable Segment	Restructuring charges for the three and six months ended June 30, 2024, by type of charge and reportable segment are as follows: Executive Search Americas Europe Asia Pacific On-Demand Talent Heidrick Consulting Global Operations Support Total Employee related $ 1,277  $ 876  $ 157  $ 286  $ 3,367  $ 976  $ 6,939
Schedule of Restructuring Accrual	Changes in the restructuring accrual for the six months ended June 30, 2024, were as follows: Accrual balance at December 31, 2023 —  Restructuring charges 6,939  Cash payments (2,570) Non-cash write-offs (6) Exchange rate fluctuations 23  Accrual balance at June 30, 2024 $ 4,386  Restructuring accruals are recorded within current Accrued salaries and benefits in the Consolidated Balance Sheets as of June 30, 2024.

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

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Changes in Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the six months ended June 30, 2024, are as follows: Available- for- Sale Securities Foreign Currency Translation Pension AOCI Balance at December 31, 2023 $ 42  $ 647  $ (560) $ 129  Other comprehensive loss before reclassification, net of tax (24) (6,161) —  (6,185) Balance at June 30, 2024 $ 18  $ (5,514) $ (560) $ (6,056)

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

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details Name: us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.24.2

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three Months Ended June 30, Six Months Ended June 30, 2024 2023 2024 2023 Revenue before reimbursements (net revenue) $ 278,626  $ 271,225  $ 543,823  $ 510,542  Net income (loss) (5,157) 8,982  8,875  24,568  Interest, net (2,612) (1,913) (6,698) (5,162) Other, net (997) (1,377) (3,568) (3,186) Provision for income taxes 4,583  7,893  13,482  15,136  Operating income (loss) (4,183) 13,585  12,091  31,356  Adjustments Depreciation 1,990  2,172  4,483  4,176  Intangible amortization 1,920  2,647  4,217  4,516  Earnout accretion 469  451  935  642  Earnout fair value adjustments 1,211  —  1,211  —  Acquisition contingent consideration 3,285  3,784  5,273  5,443  Deferred compensation plan 956  1,603  3,306  3,736  Reorganization costs —  3,396  —  3,396  Impairment charges 16,224  7,246  16,224  7,246  Restructuring charges 6,939  —  6,939  —  Total adjustments 32,994  21,299  42,588  29,155  Adjusted EBITDA $ 28,811  $ 34,884  $ 54,679  $ 60,511  Adjusted EBITDA margin 10.3  % 12.9  % 10.1  % 11.9  % Revenue and Adjusted EBITDA by segment are as follows:   Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Revenue Executive Search Americas $ 147,078  $ 138,563  $ 283,757  $ 265,890  Europe 40,082  45,567  81,563  84,498  Asia Pacific 22,807  22,649  46,128  46,878  Total Executive Search 209,967  206,779  411,448  397,266  On-Demand Talent 41,895  39,240  79,752  70,357  Heidrick Consulting 26,764  25,206  52,623  42,919  Revenue before reimbursements (net revenue) 278,626  271,225  543,823  510,542  Reimbursements 4,251  2,552  8,152  5,354  Total revenue $ 282,877  $ 273,777  $ 551,975  $ 515,896    Three Months Ended June 30, Six Months Ended June 30,   2024 2023 2024 2023 Adjusted EBITDA Executive Search Americas $ 48,112  $ 46,079  $ 89,983  $ 88,203  Europe 2,840  5,456  6,193  7,537  Asia Pacific 1,740  1,630  4,935  5,197  Total Executive Search 52,692  53,165  101,111  100,937  On-Demand Talent (1,629) 2,587  (2,550) 1,240  Heidrick Consulting (1,395) (1,662) (3,422) (4,457) Total segment operating income 49,668  54,090  95,139  97,720  Research and Development (4,781) (5,218) (9,706) (10,469) Global Operations Support (16,076) (13,988) (30,754) (26,740) Total Adjusted EBITDA $ 28,811  $ 34,884  $ 54,679  $ 60,511

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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details Name: us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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v3.24.2

Summary of Significant Accounting Policies - Reconciliation of Cash and Cash Equivalents between Balance Sheet and Cash Flow Statements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 189,922	$ 412,618	$ 217,776	$ 355,447
Restricted cash included within other non-current assets	0	0	41	42
Total cash, cash equivalents and restricted cash	$ 189,922	$ 412,618	$ 217,817	$ 355,489

X

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- 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/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details Name: us-gaap_RestrictedCash Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.24.2

Summary of Significant Accounting Policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ (5,157)	$ 14,032	$ 8,982	$ 15,586	$ 8,875	$ 24,568
Weighted average shares outstanding:
Basic (in shares)	20,259		20,010		20,202	19,958
Diluted (in shares)	20,259		20,637		21,061	20,701
Basic earnings (loss) per share (in dollars per share)	$ (0.25)		$ 0.45		$ 0.44	$ 1.23
Diluted earnings (loss) per share (in dollars per share)	$ (0.25)		$ 0.44		$ 0.42	$ 1.19
Restricted stock units
Weighted average shares outstanding:
Effect of dilutive securities:	0		516		615	584
Performance stock units
Weighted average shares outstanding:
Effect of dilutive securities:	0		111		244	159

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- 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/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-16 + Details Name: us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- 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/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-10 + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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v3.24.2

Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) reportingUnit	Jun. 30, 2023 USD ($)
Significant Accounting Policies [Line Items]
Number of reporting units | reportingUnit			5
Impairment			$ 16,224
On-Demand Talent Reporting Unit
Significant Accounting Policies [Line Items]
Impairment	$ 14,800		14,800
Europe Reporting Unit
Significant Accounting Policies [Line Items]
Impairment	$ 1,500		$ 1,500
Heidrick Consulting Reporting Unit
Significant Accounting Policies [Line Items]
Impairment		$ 7,200		$ 7,200
Restricted stock units
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings (in shares) | shares	474
Performance stock units
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings (in shares) | shares	132

X

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- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482598/350-20-45-2 + Details Name: us-gaap_GoodwillImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.24.2

Revenue - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, description of timing	six months
Deferred revenue recognized	$ 36.2
Contract with customer, performance obligation satisfied in previous period	$ 19.1

X

- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details Name: us-gaap_ContractWithCustomerLiabilityRevenueRecognized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12A + Details Name: us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.24.2

Revenue - Summary of Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Contract assets
Unbilled receivables, net	$ 19,878	$ 15,318
Contract assets	16,112	16,774
Total contract assets	35,990	32,092
Contract liabilities
Deferred revenue	44,679	$ 45,732
Change in contract assets
Unbilled receivables, net	4,560
Contract assets	(662)
Total contract assets	3,898
Change in contract liabilities
Deferred revenue	$ (1,053)

X

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X

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v3.24.2

Credit Losses - Schedule of Accounts Receivable, Allowance for Credit Loss (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2023	$ 6,954
Provision for credit losses	3,674
Write-offs	(3,051)
Foreign currency translation	366
Balance at June 30, 2024	$ 7,943

X

- Definition Accounts Receivable, Allowance for Credit Loss, Foreign Currency Translation + References No definition available. + Details Name: hsii_AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslation Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details Name: us-gaap_AllowanceForDoubtfulAccountsReceivable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit 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_AllowanceForDoubtfulAccountsReceivableRollforward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details Name: us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details Name: us-gaap_ProvisionForDoubtfulAccounts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.24.2

Credit Losses - Narrative (Details) - position	Jun. 30, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Number of positions in unrealized loss	0	0

X

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

X

- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

v3.24.2

Property and Equipment, net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 108,051	$ 98,623
Accumulated depreciation	(59,617)	(62,871)
Property and equipment, net	48,434	35,752
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,895	45,050
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,132	14,775
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 43,024	$ 38,798

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/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + 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, 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/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details Name: us-gaap_PropertyPlantAndEquipmentGross 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details Name: us-gaap_PropertyPlantAndEquipmentLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478451/942-360-50-1 + Details Name: us-gaap_PropertyPlantAndEquipmentNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Property, Plant and Equipment [Abstract]
Depreciation	$ 1,990	$ 2,172	$ 4,483	$ 4,176

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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + 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

v3.24.2

Leases - Narrative (Details)	Jun. 30, 2024
Minimum | Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	1 year
Minimum | Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	1 year
Maximum | Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	11 years 8 months 12 days
Maximum | Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	4 years 8 months 12 days

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details Name: us-gaap_LesseeLeaseDescriptionLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details Name: us-gaap_LesseeOperatingLeaseTermOfContract Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: instant

X

- Details Name: srt_RangeAxis=srt_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember 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:

X

- Details Name: srt_RangeAxis=srt_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating lease cost	$ 6,719	$ 4,567	$ 12,356	$ 9,092
Variable lease cost	2,570	3,071	5,025	4,987
Total lease cost	$ 9,289	$ 7,638	$ 17,381	$ 14,079

X

- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_LeaseCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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 Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_OperatingLeaseCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_VariableLeaseCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.24.2

Leases - Schedule Of Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating cash flows from operating leases	$ 11,807	$ 10,082
Right-of-use assets obtained in exchange for lease obligations:	$ 7,447	$ 7,520

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 Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_OperatingLeasePayments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.24.2

Leases - Schedule of Weighted Average Information Related to Leases (Details)	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Weighted Average Remaining Lease Term	7 years 4 months 24 days	6 years 3 months 18 days
Weighted Average Discount Rate	5.01%	3.79%

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 Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Namespace Prefix: us-gaap_ Data Type: dtr-types:percentItemType Balance Type: na Period Type: instant

X

- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details Name: us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: instant

v3.24.2

Leases - Schedule of Future Maturities for Operating Leases (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Leases [Abstract]
2024	$ 11,098
2025	17,601
2026	16,018
2027	15,785
2028	12,296
Thereafter	47,313
Total lease payments	120,111
Less: Interest	23,947
Present value of lease liabilities	$ 96,164

X

- Definition Lessee, Operating Lease, Liability, to be Paid, After Year Four + References No definition available. + Details Name: hsii_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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 Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details Name: us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details Name: us-gaap_OperatingLeaseLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.24.2

Financial Instruments and Fair Value - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 129,607	$ 242,228
Unrealized Gains	18	42
Fair Value	129,625	242,270
Cash and cash equivalents	189,922	412,618	$ 217,776	$ 355,447
Marketable Securities	106,963	65,538
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	129,607	242,228
Unrealized Gains	18	42
Fair Value	129,625	242,270
Cash and cash equivalents	41,348	190,638
Marketable Securities	106,963	65,538
Fair Value, Inputs, Level 1 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	18,686	13,906
Marketable Securities	0	0
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	129,607	242,228
Unrealized Gains	18	42
Fair Value	129,625	242,270
Cash and cash equivalents	22,662	176,732
Marketable Securities	106,963	65,538
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	148,574	221,980
Marketable Securities	$ 0	$ 0

X

- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details Name: us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit 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/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_MarketableSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Financial Instruments and Fair Value - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate cost basis for non-qualified deferred compensation plan	$ 42,800,000	$ 42,800,000	$ 37,200,000
Acquisition earnout accruals, non-current	39,700,000	39,700,000	38,601,000
Impairment		16,224,000
Equity investment without readily determinable fair value, amount	11,000,000	11,000,000	0
On-Demand Talent Reporting Unit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment	14,800,000	14,800,000
Europe Reporting Unit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment	1,500,000	1,500,000
Earnout | Fair Value, Inputs, Level 3 | Non-Current and Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, non-current	39,700,000	39,700,000	38,600,000
Contingent Compensation | Fair Value, Inputs, Level 3 | Current Accrued Salaries and Benefits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, current	4,000,000	4,000,000	6,000,000
Contingent Compensation | Fair Value, Inputs, Level 3 | Non-Current Accrued Salaries and Benefits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, non-current	$ 14,400,000	$ 14,400,000	$ 12,900,000

X

- Definition Acquisition Earnout Accruals, Current + References No definition available. + Details Name: hsii_AcquisitionEarnoutAccrualsCurrent Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Acquisition Earnout Accruals, Non-Current + References No definition available. + Details Name: hsii_AcquisitionEarnoutAccrualsNonCurrent Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Aggregate Cost Basis for Non-Qualified Deferred Compensation Plan + References No definition available. + Details Name: hsii_AggregateCostBasisForNonQualifiedDeferredCompensationPlan Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details Name: us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482598/350-20-45-2 + Details Name: us-gaap_GoodwillImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_ReportingUnitAxis=hsii_OnDemandTalentReportingUnitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_ReportingUnitAxis=hsii_EuropeReportingUnitMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FairValueByLiabilityClassAxis=hsii_AcqusitionEarnoutAccrualsMember 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_BalanceSheetLocationAxis=hsii_NonCurrentAndOtherNonCurrentLiabilitiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_FairValueByLiabilityClassAxis=hsii_ContingentCompensationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_BalanceSheetLocationAxis=hsii_CurrentAccruedSalariesAndBenefitsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_BalanceSheetLocationAxis=hsii_NonCurrentAccruedSalariesAndBenefitsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Financial Instruments and Fair Value - Schedule of Fair Value, Separate Account Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 53,964	$ 45,265
Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	1,251	1,289
Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	10,779	11,105
Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	55,927	47,287
Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	(1,251)	(1,289)
Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	(12,742)	(13,127)
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	55,927	47,287
Fair Value, Inputs, Level 1 | Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 | Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 | Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	55,927	47,287
Fair Value, Inputs, Level 1 | Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 | Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	12,030	12,394
Pension benefit obligation	(13,993)	(14,416)
Total	(1,963)	(2,022)
Fair Value, Inputs, Level 2 | Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	1,251	1,289
Pension benefit obligation	0	0
Total	1,251	1,289
Fair Value, Inputs, Level 2 | Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	10,779	11,105
Pension benefit obligation	0	0
Total	10,779	11,105
Fair Value, Inputs, Level 2 | Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	0	0
Total	0	0
Fair Value, Inputs, Level 2 | Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	(1,251)	(1,289)
Total	(1,251)	(1,289)
Fair Value, Inputs, Level 2 | Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	(12,742)	(13,127)
Total	$ (12,742)	$ (13,127)

X

- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_DeferredCompensationPlanAssets 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/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details Name: us-gaap_DefinedBenefitPlanBenefitObligation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details Name: us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value of asset after deduction of liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details Name: us-gaap_FairValueNetAssetLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BalanceSheetLocationAxis=hsii_AssetsDesignatedForRetirementAndPensionPlansMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_BalanceSheetLocationAxis=us-gaap_InvestmentsMember 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_BalanceSheetLocationAxis=us-gaap_PensionPlansDefinedBenefitMember 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:

v3.24.2

Financial Instruments and Fair Value - Schedule of Reconciliation of Level 3 Assets and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Earnout
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2023	$ (38,601)
Earnout accretion	(935)
Compensation expense	0
Fair value adjustment	(1,211)
Payments	0
Foreign currency translation	1,047
Balance at June 30, 2024	(39,700)
Contingent Compensation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2023	(18,878)
Earnout accretion	0
Compensation expense	(5,273)
Fair value adjustment	0
Payments	4,821
Foreign currency translation	990
Balance at June 30, 2024	$ (18,340)

X

- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Compensation Expense + References No definition available. + Details Name: hsii_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityCompensationExpense Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Earnout Accretion + References No definition available. + Details Name: hsii_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityEarnoutAccretion Namespace Prefix: hsii_ 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_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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v3.24.2

Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended				6 Months Ended
	Apr. 01, 2023	Feb. 01, 2023	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Acquisition [Line Items]
Payments to acquire businesses, gross							$ 0	$ 35,749
Goodwill			$ 202,252				$ 183,150
Atreus
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 12,100			$ 33,400
Future consideration, minimum		$ 30,000
Future consideration, maximum		40,000
Goodwill		62,400
Atreus | Earnout | Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued		32,000
Atreus | Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired		11,300
Atreus | Software
Business Acquisition [Line Items]
Finite-lived intangibles acquired		5,400
Atreus | Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired		$ 2,500
BusinessFourZero
Business Acquisition [Line Items]
Payments to acquire businesses, gross				$ 2,200	$ 9,500
Future consideration, minimum	$ 4,000
Future consideration, maximum	8,000
Goodwill	7,100
BusinessFourZero | Earnout | Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued	4,300
BusinessFourZero | Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired	3,500
BusinessFourZero | Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired	$ 500

X

- Definition Acquisition Earnout, Fair Value Disclosure + References No definition available. + Details Name: hsii_AcquisitionEarnoutFairValueDisclosure Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details Name: us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-37 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.24.2

Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, gross	$ 206,620	$ 209,498
Accumulated impairment losses	(23,470)	(7,246)
Goodwill	183,150	202,252
Executive Search
Goodwill [Line Items]
Goodwill, gross	92,654	93,234
Executive Search | Americas
Goodwill [Line Items]
Goodwill, gross	91,191	91,740
Accumulated impairment losses	0	0
Goodwill	91,191	91,740
Executive Search | Europe
Goodwill [Line Items]
Goodwill, gross	1,463	1,494
Accumulated impairment losses	(1,463)	0
Goodwill	0	1,494
On-Demand Talent
Goodwill [Line Items]
Goodwill, gross	106,720	109,018
Accumulated impairment losses	(14,761)	0
Goodwill	91,959	109,018
Heidrick Consulting
Goodwill [Line Items]
Goodwill, gross	7,246	7,246
Accumulated impairment losses	(7,246)	(7,246)
Goodwill	$ 0	$ 0

X

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- Definition Amount of accumulated impairment loss for asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details Name: us-gaap_GoodwillImpairedAccumulatedImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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v3.24.2

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Segment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 202,252
Impairment	(16,224)
Foreign currency translation	(2,878)
Goodwill, ending balance	183,150
Accumulated impairment losses	(23,470)	$ (7,246)
Goodwill, gross	206,620	209,498
Executive Search
Goodwill [Roll Forward]
Goodwill, gross	92,654	93,234
On-Demand Talent
Goodwill [Roll Forward]
Goodwill, beginning balance	109,018
Impairment	(14,761)
Foreign currency translation	(2,298)
Goodwill, ending balance	91,959
Accumulated impairment losses	(14,761)	0
Goodwill, gross	106,720	109,018
Heidrick Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Impairment	0
Foreign currency translation	0
Goodwill, ending balance	0
Accumulated impairment losses	(7,246)	(7,246)
Goodwill, gross	7,246	7,246
Americas | Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	91,740
Impairment	0
Foreign currency translation	(549)
Goodwill, ending balance	91,191
Accumulated impairment losses	0	0
Goodwill, gross	91,191	91,740
Europe | Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	1,494
Impairment	(1,463)
Foreign currency translation	(31)
Goodwill, ending balance	0
Accumulated impairment losses	(1,463)	0
Goodwill, gross	$ 1,463	$ 1,494

X

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v3.24.2

Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 16,411	$ 20,842
Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	76	117
On-Demand Talent
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	13,931	17,689
Heidrick Consulting
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	2,404	3,036
Americas | Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	11	22
Europe | Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 65	$ 95

X

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v3.24.2

Goodwill and Other Intangible Assets - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	8 years 4 months 24 days
Gross Carrying Amount	$ 39,146	$ 39,891
Accumulated Amortization	(22,735)	(19,049)
Total other intangible assets, net	$ 16,411	20,842
Client relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	10 years 2 months 12 days
Gross Carrying Amount	$ 25,729	26,195
Accumulated Amortization	(13,532)	(11,443)
Total other intangible assets, net	$ 12,197	14,752
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years
Gross Carrying Amount	$ 4,950	5,067
Accumulated Amortization	(3,563)	(3,069)
Total other intangible assets, net	$ 1,387	1,998
Software
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years
Gross Carrying Amount	$ 8,467	8,629
Accumulated Amortization	(5,640)	(4,537)
Total other intangible assets, net	$ 2,827	$ 4,092

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/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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v3.24.2

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Oct. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Impairment			$ 16,224
Intangible amortization	$ 1,920	$ 2,647	4,217	$ 4,516
On-Demand Talent Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Goodwill forecast margin, percentage					6.00%
Impairment	14,800		14,800
Europe Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 1,500		$ 1,500
Heidrick Consulting Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Impairment		7,200		$ 7,200
BusinessFourZero
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired		$ 7,100

X

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- 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/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details Name: us-gaap_GoodwillAcquiredDuringPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482598/350-20-45-2 + Details Name: us-gaap_GoodwillImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.24.2

Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 3,620
2025	5,835
2026	2,476
2027	1,506
2028	882
Thereafter	2,092
Total other intangible assets, net	$ 16,411	$ 20,842

X

- Definition HS:Finite-Lived Intangible Asset, Expected Amortization, After Year Four + References No definition available. + Details Name: hsii_HSFiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483154/926-20-50-5 + Details Name: us-gaap_FiniteLivedIntangibleAssetsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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

v3.24.2

Other Current and Non-current Assets and Liabilities - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Contract assets	$ 35,990	$ 32,092
Other	7,755	15,831
Other current assets	$ 43,745	$ 47,923

X

- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details Name: us-gaap_ContractWithCustomerAssetNetCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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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

v3.24.2

Other Current and Non-current Assets and Liabilities - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Earnout liability	$ 39,700	$ 38,601
Other	2,862	3,207
Other non-current liabilities	$ 42,562	$ 41,808

X

- Definition Acquisition Earnout Accruals, Non-Current + References No definition available. + Details Name: hsii_AcquisitionEarnoutAccrualsNonCurrent Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

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X

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X

- Definition Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details Name: us-gaap_OtherSundryLiabilitiesNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.24.2

Line of Credit (Details) - The Credit Agreement - Line of Credit - USD ($)	Feb. 24, 2023	Jun. 30, 2024	Dec. 31, 2023	Feb. 23, 2023
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 200,000,000			$ 175,000,000
Expansion borrowing capacity	75,000,000
Outstanding borrowings		$ 0	$ 0
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000
Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000

X

- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details Name: hsii_LineOfCreditFacilityAccordionFeatureIncreaseLimit Namespace Prefix: hsii_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details Name: us-gaap_LineOfCredit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Details Name: us-gaap_DebtInstrumentAxis=hsii_TheCreditAgreementMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember 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_CreditFacilityAxis=us-gaap_BridgeLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Stock-Based Compensation and Common Stock - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	May 23, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Feb. 11, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	649,000
Awards issued to date (in shares)		4,744,660		4,744,660
Awards forfeited to date (in shares)		792,136		792,136
Awards available for grant (in shares)		834,082		834,082
Shares issued for services (in shares)		12,564	16,134
Stock repurchase program, authorized amount						$ 50,000,000
Repurchase of common stock (in shares)		0	36,000	0	36,000
Repurchase of common stock			$ 904,000		$ 900,000
Total shares acquired to date (in shares)		1,074,670		1,074,670
Total shares acquired to date		$ 29,200,000		$ 29,200,000
Remaining authorized repurchase amount		$ 20,800,000		20,800,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)		16,752	16,134
Unrecognized compensation expense		$ 10,600,000		$ 10,600,000
Period for recognition (in years)				2 years 4 months 24 days
Share-based payment arrangement, expense (income)		100,000	$ (700,000)	$ 900,000	$ 100,000
Restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Unrecognized compensation expense		8,300,000		$ 8,300,000
Period for recognition (in years)				2 years 7 months 6 days
Performance stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				0.00%
Award service period				1 year
Performance stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				100.00%
Award service period				4 years
Phantom share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 1,600,000		$ 1,600,000
Period for recognition (in years)				2 years 6 months
Phantom share units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Phantom share units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Executive Officer | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Executive Officer | Performance stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				0.00%
Executive Officer | Performance stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				200.00%

X

- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Forfeited to Date + References No definition available. + Details Name: hsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesForfeitedToDate Namespace Prefix: hsii_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Issued To Date + References No definition available. + Details Name: hsii_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedToDate Namespace Prefix: hsii_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details Name: srt_StockRepurchaseProgramAuthorizedAmount1 Namespace Prefix: srt_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_AllocatedShareBasedCompensationExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Line items represent financial concepts included in a table. 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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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v3.24.2

Stock-Based Compensation and Common Stock - Summary of Information Related to Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit related to stock-based compensation included in net income	$ 958	$ 445	$ 1,907	$ 1,160
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense (income)	100	(700)	900	100
Salaries and benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salaries and benefits	2,429	806	5,870	3,403
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salaries and benefits	$ 1,050	$ 810	$ 1,050	$ 810

X

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X

- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Line items represent financial concepts included in a table. 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X

- Definition Amount of cost expensed and capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_IncomeStatementLocationAxis=hsii_LaborAndRelatedExpensesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Stock-Based Compensation and Common Stock - Schedule of Restricted Stock Unit Activity (Details) - Restricted stock units	6 Months Ended
	Jun. 30, 2024 $ / shares shares
Number of Restricted Stock Units
Outstanding on beginning balance (in shares) | shares	686,741
Granted (in shares) | shares	292,447
Vested and converted to common stock (in shares) | shares	(193,056)
Forfeited (in shares) | shares	(7,091)
Outstanding on ending balance (in shares) | shares	779,041
Weighted- Average Grant-Date Fair Value
Outstanding on beginning balance (in dollars per share) | $ / shares	$ 30.33
Granted (in dollars per share) | $ / shares	33.42
Vested and converted to common stock (in dollars per share) | $ / shares	33.08
Forfeited (in dollars per share) | $ / shares	30.15
Outstanding on ending balance (in dollars per share) | $ / shares	$ 30.81

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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types: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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types: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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types:perShareItemType Balance Type: na Period Type: instant

X

- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types:perShareItemType 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Stock-Based Compensation and Common Stock - Schedule of Performance Stock Unit Activity (Details) - Performance stock units	6 Months Ended
	Jun. 30, 2024 $ / shares shares
Number of Performance Stock Units
Outstanding on beginning balance (in shares) | shares	239,625
Granted (in shares) | shares	273,536
Vested and converted to common stock (in shares) | shares	(104,154)
Forfeited (in shares) | shares	(720)
Outstanding on ending balance (in shares) | shares	408,287
Weighted- Average Grant-Date Fair Value
Outstanding on beginning balance (in dollars per share) | $ / shares	$ 41.91
Granted (in dollars per share) | $ / shares	32.64
Vested and converted to common stock (in dollars per share) | $ / shares	44.18
Forfeited (in dollars per share) | $ / shares	27.82
Outstanding on ending balance (in dollars per share) | $ / shares	$ 35.14

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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types: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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types: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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types:perShareItemType Balance Type: na Period Type: instant

X

- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: dtr-types:perShareItemType 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Stock-Based Compensation and Common Stock - Schedule of Phantom Stock Unit Activity (Details) - Phantom share units	6 Months Ended
	Jun. 30, 2024 shares
Number of Phantom Stock Units
Outstanding on beginning balance (in shares)	187,301
Granted (in shares)	33,247
Vested (in shares)	0
Forfeited (in shares)	0
Outstanding on ending balance (in shares)	220,548

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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_AwardTypeAxis=us-gaap_PhantomShareUnitsPSUsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 6,939	$ 0	$ 6,939	$ 0

X

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

X

- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482047/420-10-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 + Details Name: us-gaap_RestructuringCharges Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.24.2

Restructuring - Schedule of Restructuring Charges Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6,939	$ 0	$ 6,939	$ 0
Employee Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,939		6,939
Employee Related | On-Demand Talent
Restructuring Cost and Reserve [Line Items]
Restructuring charges	286		286
Employee Related | Heidrick Consulting
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,367		3,367
Employee Related | Global Operations Support
Restructuring Cost and Reserve [Line Items]
Restructuring charges	976		976
Americas | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,277		1,277
Europe | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges	876		876
Asia Pacific | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 157		$ 157

X

- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482047/420-10-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 + Details Name: us-gaap_RestructuringCharges Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_RestructuringCostAndReserveLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Details Name: us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=hsii_OnDemandTalentSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=hsii_HeidrickConsultingSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=hsii_GlobalOperationsSupportSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_StatementGeographicalAxis=srt_AmericasMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_StatementBusinessSegmentsAxis=hsii_ExecutiveSearchSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_StatementGeographicalAxis=srt_EuropeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_StatementGeographicalAxis=srt_AsiaPacificMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Restructuring - Schedule of Restructuring Accrual (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Reserve [Roll Forward]
Accrual balance at December 31, 2022			$ 0
Restructuring charges	$ 6,939	$ 0	6,939	$ 0
Cash payments			(2,570)
Non-cash write-offs			(6)
Exchange rate fluctuations			23
Accrual balance at December 31, 2022	4,386		4,386
Employee Related
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 6,939		$ 6,939

X

- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-17 + Details Name: us-gaap_PaymentsForRestructuring Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482047/420-10-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 + Details Name: us-gaap_RestructuringCharges Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_RestructuringReserve Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit 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_RestructuringReserveRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of decrease in the reserve for full or partial settlement through consideration other than cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_RestructuringReserveSettledWithoutCash2 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details Name: us-gaap_RestructuringReserveTranslationAdjustment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Details Name: us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.24.2

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (574)	$ 16,875	$ 22,357	$ 39,704
Provision for income taxes	$ 4,583	$ 7,893	$ 13,482	$ 15,136
Effective income tax rate reconciliation, percent	(798.40%)	46.80%	60.30%	38.10%

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/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details Name: us-gaap_EffectiveIncomeTaxRateContinuingOperations Namespace Prefix: us-gaap_ Data Type: dtr-types:percentItemType Balance Type: na Period Type: duration

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- Definition Amount, before tax, of income (loss) attributable to parent. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482765/220-10-50-6 + Details Name: us-gaap_IncomeLossAttributableToParent 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

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- 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/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-9 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-8 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-10 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -SubTopic 20 -Topic 740 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482659/740-20-45-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -SubTopic 10 -Topic 235 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details Name: us-gaap_IncomeTaxExpenseBenefit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.24.2

Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 462,278
Other comprehensive loss before reclassification, net of tax	(6,185)
Ending balance	460,932
Available- for- Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	42
Other comprehensive loss before reclassification, net of tax	(24)
Ending balance	18
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	647
Other comprehensive loss before reclassification, net of tax	(6,161)
Ending balance	(5,514)
Pension
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(560)
Other comprehensive loss before reclassification, net of tax	0
Ending balance	(560)
AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	129
Ending balance	$ (6,056)

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

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v3.24.2

Segment Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2024 operatingSegment
Segment Reporting [Abstract]
Number of operating segments	5

X

- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + Details Name: us-gaap_NumberOfOperatingSegments Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

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v3.24.2

Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting [Abstract]
Revenue before reimbursements (net revenue)	$ 278,626		$ 271,225		$ 543,823	$ 510,542
Net income (loss)	(5,157)	$ 14,032	8,982	$ 15,586	8,875	24,568
Interest, net	(2,612)		(1,913)		(6,698)	(5,162)
Other, net	(997)		(1,377)		(3,568)	(3,186)
Provision for income taxes	4,583		7,893		13,482	15,136
Operating income (loss)	(4,183)		13,585		12,091	31,356
Depreciation	1,990		2,172		4,483	4,176
Intangible amortization	1,920		2,647		4,217	4,516
Earnout accretion	469		451		935	642
Earnout fair value adjustments	1,211		0		1,211	0
Acquisition contingent consideration	3,285		3,784		5,273	5,443
Deferred compensation plan	956		1,603		3,306	3,736
Reorganization costs	0		3,396		0	3,396
Impairment charges	16,224		7,246		16,224	7,246
Restructuring charges	6,939		0		6,939	0
Total adjustments	32,994		21,299		42,588	29,155
Adjusted EBITDA	$ 28,811		$ 34,884		$ 54,679	$ 60,511
Adjusted EBITDA margin	10.30%		12.90%		10.10%	11.90%

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v3.24.2

Segment Information - Schedule of Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	$ 278,626	$ 271,225	$ 543,823	$ 510,542
Reimbursements	4,251	2,552	8,152	5,354
Total revenue	282,877	273,777	551,975	515,896
Adjusted EBITDA	28,811	34,884	54,679	60,511
Total Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	49,668	54,090	95,139	97,720
Executive Search
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	209,967	206,779	411,448	397,266
Adjusted EBITDA	52,692	53,165	101,111	100,937
Executive Search | Americas
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	147,078	138,563	283,757	265,890
Adjusted EBITDA	48,112	46,079	89,983	88,203
Executive Search | Europe
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	40,082	45,567	81,563	84,498
Adjusted EBITDA	2,840	5,456	6,193	7,537
Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	22,807	22,649	46,128	46,878
Adjusted EBITDA	1,740	1,630	4,935	5,197
On-Demand Talent
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	41,895	39,240	79,752	70,357
Adjusted EBITDA	(1,629)	2,587	(2,550)	1,240
Heidrick Consulting
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	26,764	25,206	52,623	42,919
Adjusted EBITDA	(1,395)	(1,662)	(3,422)	(4,457)
Research And Development Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	(4,781)	(5,218)	(9,706)	(10,469)
Global Operations Support
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (16,076)	$ (13,988)	$ (30,754)	$ (26,740)

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v3.24.2

Guarantees (Details) $ in Millions	Jun. 30, 2024 USD ($)
Guarantees and Product Warranties [Abstract]
Guarantor obligations, maximum exposure, undiscounted	$ 4.8

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