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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | $ 138,361 | $ 138,524 | $ 91,643 |
Acquired goodwill |  |  |  | 69,444 |  |  |
Impairment |  |  |  | (7,246) |  |  |
Foreign currency translation |  |  |  | 1,693 | (163) | (180) |
Goodwill, ending balance |  |  |  | 202,252 | 138,361 | 138,524 |
Goodwill, gross |  |  |  | 242,468 |  |  | $ 124,613
Accumulated impairment losses |  |  |  | (40,216) |  |  | (32,970)
BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 45,529 |
Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 1,532 |
Atreus |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  | 62,371 |  |  |
Businessfourzero |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  | $ 7,100 | 7,073 |  |  |
Executive Search |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 92,832 |  |  |
Goodwill, ending balance |  |  |  | 93,234 | 92,832 |  |
On-Demand Talent |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 45,529 | 45,529 | 0 |
Impairment |  |  |  | 0 |  |  |
Foreign currency translation |  |  |  | 1,118 | 0 | 0 |
Goodwill, ending balance |  |  |  | 109,018 | 45,529 | 45,529 |
Goodwill, gross |  |  |  | 109,018 |  |  | 0
Accumulated impairment losses |  |  |  | 0 |  |  | 0
On-Demand Talent | BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 45,529 |
On-Demand Talent | Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 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 |  |  |  | (7,246) |  |  |
Foreign currency translation |  |  |  | 173 | 0 | 0 |
Goodwill, ending balance |  |  |  | 0 | 0 | 0 |
Goodwill, gross |  |  |  | 7,246 |  |  | 0
Accumulated impairment losses |  |  |  | (7,246) |  |  | 0
Heidrick Consulting | BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 0 |
Heidrick Consulting | Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 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 |  |  |  | 91,383 | 91,463 | 91,643 |
Impairment |  |  |  | 0 |  |  |
Foreign currency translation |  |  |  | 357 | (80) | (180) |
Goodwill, ending balance |  |  |  | 91,740 | 91,383 | 91,463 |
Goodwill, gross |  |  |  | 91,740 |  |  | 91,643
Accumulated impairment losses |  |  |  | 0 |  |  | 0
Americas | Executive Search | BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 0 |
Americas | Executive Search | Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 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 |  |  |  | 1,449 | 1,532 | 0 |
Impairment |  |  |  | 0 |  |  |
Foreign currency translation |  |  |  | 45 | (83) | 0 |
Goodwill, ending balance |  |  |  | 1,494 | 1,449 | 1,532 |
Goodwill, gross |  |  |  | 25,969 |  |  | 24,475
Accumulated impairment losses |  |  |  | (24,475) |  |  | (24,475)
Europe | Executive Search | BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 0 |
Europe | Executive Search | Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 1,532 |
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 |  |  |
Foreign currency translation |  |  |  | 0 | 0 | 0 |
Goodwill, ending balance |  |  |  | 0 | $ 0 | 0 |
Goodwill, gross |  |  |  | 8,495 |  |  | 8,495
Accumulated impairment losses |  |  |  | (8,495) |  |  | $ (8,495)
Asia Pacific | Executive Search | BTG |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | 0 |
Asia Pacific | Executive Search | Finland |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | $ 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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