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Summary of Significant Accounting Policies - Narrative (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 | Dec. 31, 2023 reporting_unit | Dec. 31, 2023 USD ($) | Dec. 31, 2023 | Dec. 31, 2023 unit | Dec. 31, 2022
Goodwill [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents maximum maturity period |  |  | 3 months |  |  |  |  |
Concentration risk, customer |  |  | no |  |  |  |  | no
Number of reporting units |  |  |  | 5 |  |  | 5 |
Acquired goodwill |  |  |  |  | $ 69,444 |  |  |
Impairment |  |  |  |  | 7,246 |  |  |
Vesting period of deferred cash bonuses |  |  | 3 years |  |  |  |  |
Variation percentage of deferred cash bonuses |  |  |  |  |  | 15.00% |  |
Additional vesting period after deferral date for bonus payment |  |  | 3 years |  |  |  |  |
Heidrick Consulting |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Impairment |  |  |  |  | 7,246 |  |  |
Businessfourzero |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Acquired goodwill |  | $ 7,100 |  |  | 7,073 |  |  |
Businessfourzero | Heidrick Consulting |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Acquired goodwill | $ 7,100 |  |  |  | $ 7,073 |  |  |

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