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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2023 | Feb. 28, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | $ 202,252 | $ 138,361 | $ 138,524 |
Impairment |  |  |  | (59,478) | (7,246) | 0 |
Foreign currency translation |  |  |  | (4,913) | 1,693 | (163) |
Goodwill, ending balance |  |  |  | 137,861 | 202,252 | 138,361 |
Goodwill, gross |  |  |  | 204,585 | 209,498 |  | $ 138,524
Accumulated impairment losses |  |  |  | (66,724) | (7,246) |  | 0
Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 62,371 |  |
Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  | $ 7,100 |  | 7,073 |  |
Executive Search |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, gross |  |  |  | 92,203 | 93,234 |  |
On-Demand Talent |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 109,018 | 45,529 | 45,529 |
Impairment |  |  |  | (58,015) | 0 |  |
Foreign currency translation |  |  |  | (3,882) | 1,118 | 0 |
Goodwill, ending balance |  |  |  | 47,121 | 109,018 | 45,529 |
Goodwill, gross |  |  |  | 105,136 | 109,018 |  | 45,529
Accumulated impairment losses |  |  |  | (58,015) |  |  | 0
On-Demand Talent | Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  | $ 62,400 |  |  | 62,371 |  |
On-Demand Talent | Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Heidrick Consulting |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 0 | 0 | 0 |
Impairment |  |  |  | 0 | (7,246) |  |
Foreign currency translation |  |  |  | 0 | 173 | 0 |
Goodwill, ending balance |  |  |  | 0 | 0 | 0 |
Goodwill, gross |  |  |  | 7,246 | 7,246 |  | 0
Accumulated impairment losses |  |  |  | (7,246) |  |  | 0
Heidrick Consulting | Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Heidrick Consulting | Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill | $ 7,100 |  |  |  | 7,073 |  |
Americas | Executive Search |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 91,740 | 91,383 | 91,463 |
Impairment |  |  |  | 0 | 0 |  |
Foreign currency translation |  |  |  | (1,000) | 357 | (80) |
Goodwill, ending balance |  |  |  | 90,740 | 91,740 | 91,383 |
Goodwill, gross |  |  |  | 90,740 | 91,740 |  | 91,463
Accumulated impairment losses |  |  |  | 0 |  |  | 0
Americas | Executive Search | Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Americas | Executive Search | Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Europe | Executive Search |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 1,494 | 1,449 | 1,532 |
Impairment |  |  |  | (1,463) | 0 |  |
Foreign currency translation |  |  |  | (31) | 45 | (83) |
Goodwill, ending balance |  |  |  | 0 | 1,494 | 1,449 |
Goodwill, gross |  |  |  | 1,463 | 1,494 |  | 1,532
Accumulated impairment losses |  |  |  | (1,463) |  |  | 0
Europe | Executive Search | Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Europe | Executive Search | Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Asia Pacific | Executive Search |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 0 | 0 | 0 |
Impairment |  |  |  | 0 | 0 |  |
Foreign currency translation |  |  |  |  | 0 | 0 |
Goodwill, ending balance |  |  |  | 0 | 0 | $ 0 |
Goodwill, gross |  |  |  | 0 | 0 |  | 0
Accumulated impairment losses |  |  |  | $ 0 |  |  | $ 0
Asia Pacific | Executive Search | Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | 0 |  |
Asia Pacific | Executive Search | Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | $ 0 |  |

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