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Financial Instruments and Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2023
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 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 |
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Marketable Securities
Balance at December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ | 247,198 |  |  | $ | — |
Level 1(1): |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  |  |  |  |  |  |  | 62,338 |  |  |
U.S. Treasury securities | 312,121 |  |  | 15 |  |  | (56) |  |  | 312,080 |  |  | 45,911 |  |  | 266,169 |
Total Level 1 | 312,121 |  |  | 15 |  |  | (56) |  |  | 312,080 |  |  | 108,249 |  |  | 266,169 |
Total | $ | 312,121 |  |  | $ | 15 |  |  | $ | (56) |  |  | $ | 312,080 |  |  | $ | 355,447 |  |  | $ | 266,169 |
(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 on a recurring basis:
|  |  |  | Balance Sheet Classification
|  | 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) |
|  |  |  | Balance Sheet Classification
|  | Fair Value |  | Other Current Assets |  |  |  | Assets Designated for Retirement and Pension Plans |  | Investments |  | Other Current Liabilities |  | Retirement and Pension Plans
Balance at December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measured on a recurring basis: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 1(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. non-qualified deferred compensation plan |  | $ | 34,354 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 34,354 |  |  | $ | — |  |  | $ | — |
Level 2(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement and pension plan assets |  | 12,584 |  |  | 1,252 |  |  |  |  | 11,332 |  |  | — |  |  | — |  |  | — |
Pension benefit obligation |  | (13,951) |  |  | — |  |  |  |  | — |  |  | — |  |  | (1,252) |  |  | (12,699) |
Total Level 2 |  | (1,367) |  |  | 1,252 |  |  |  |  | 11,332 |  |  | — |  |  | (1,252) |  |  | (12,699) |
Total |  | $ | 32,987 |  |  | $ | 1,252 |  |  |  |  | $ | 11,332 |  |  | $ | 34,354 |  |  | $ | (1,252) |  |  | $ | (12,699) |
(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 year ended December 31, 2023:
|  | Earnout |  | Contingent Compensation
Balance at December 31, 2022 |  | $ | (36,010) |  |  | $ | (8,192) |
Purchase accounting (see Note 8, Acquisitions) |  | (36,266) |  |  | — |
Earnout accretion |  | (1,554) |  |  | — |
Compensation expense |  | — |  |  | (11,934) |
Payments |  | 35,946 |  |  | 2,038 |
Foreign currency translation |  | (717) |  |  | (790) |
Balance at December 31, 2023 |  | $ | (38,601) |  |  | $ | (18,878) |
Schedule of Changes in Carrying Amount of Goodwill by Segment | The following table provides a reconciliation of the beginning and ending balance of Level 3 assets for the year ended December 31, 2023:
| Goodwill
Balance at December 31, 2022 | $ | 138,361 |
Acquired goodwill | 69,444 |
Impairment | (7,246) |
Foreign currency translation | 1,693 |
Balance at December 31, 2023 | $ | 202,252 |
Changes in the carrying amount of goodwill by segment for the years ended December 31, 2023, 2022, and 2021 were as follows:
| Executive Search |  |  |  |  |  |  |  |  |  |
| Americas |  | Europe |  | Asia Pacific |  |  |  |  |  | On-Demand Talent |  | Heidrick Consulting |  | Total
Goodwill | $ | 91,643 |  |  | $ | 24,475 |  |  | $ | 8,495 |  |  |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 124,613 |
Accumulated impairment losses | — |  |  | (24,475) |  |  | (8,495) |  |  |  |  |  |  | — |  |  | — |  |  | (32,970) |
Balance at December 31, 2020 | 91,643 |  |  | — |  |  | — |  |  |  |  |  |  | — |  |  | — |  |  | 91,643 |
BTG acquisition | — |  |  | — |  |  | — |  |  |  |  |  |  | 45,529 |  |  | — |  |  | 45,529 |
Finland acquisition | — |  |  | 1,532 |  |  | — |  |  |  |  |  |  | — |  |  | — |  |  | 1,532 |
Foreign currency translation | (180) |  |  | — |  |  | — |  |  |  |  |  |  | — |  |  | — |  |  | (180) |
Balance at December 31, 2021 | 91,463 |  |  | 1,532 |  |  | — |  |  |  |  |  |  | 45,529 |  |  | — |  |  | 138,524 |
Foreign currency translation | (80) |  |  | (83) |  |  | — |  |  |  |  |  |  | — |  |  | — |  |  | (163) |
Balance at December 31, 2022 | 91,383 |  |  | 1,449 |  |  | — |  |  |  |  |  |  | 45,529 |  |  | — |  |  | 138,361 |
Atreus acquisition | — |  |  | — |  |  | — |  |  |  |  |  |  | 62,371 |  |  | — |  |  | 62,371 |
businessfourzero acquisition | — |  |  | — |  |  | — |  |  |  |  |  |  | — |  |  | 7,073 |  |  | 7,073 |
Impairment | — |  |  | — |  |  | — |  |  |  |  |  |  | — |  |  | (7,246) |  |  | (7,246) |
Foreign currency translation | 357 |  |  | 45 |  |  | — |  |  |  |  |  |  | 1,118 |  |  | 173 |  |  | 1,693 |
Goodwill | 91,740 |  |  | 25,969 |  |  | 8,495 |  |  |  |  |  |  | 109,018 |  |  | 7,246 |  |  | 242,468 |
Accumulated impairment losses | — |  |  | (24,475) |  |  | (8,495) |  |  |  |  |  |  | — |  |  | (7,246) |  |  | (40,216) |
Balance at December 31, 2023 | $ | 91,740 |  |  | $ | 1,494 |  |  | $ | — |  |  |  |  |  |  | $ | 109,018 |  |  | $ | — |  |  | $ | 202,252 |

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