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Goodwill and Other Intangible Assets - Narrative (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2023 USD ($) | Feb. 28, 2023 USD ($) | Oct. 31, 2021 USD ($) | Apr. 30, 2021 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 | Dec. 31, 2023 reporting_unit | Dec. 31, 2023 USD ($) | Dec. 31, 2023 unit | Dec. 31, 2023 | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 01, 2023 USD ($) | Feb. 01, 2023 USD ($)
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | $ 69,444 |  |  |  |  |  |
Number of reporting units |  |  |  |  |  |  | 5 |  | 5 |  |  |  |  |
Impairment |  |  |  |  |  |  |  | 7,246 |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  | 7 years 10 months 24 days |  |  |  |  |  |  |  |
Intangible amortization |  |  |  |  |  |  |  | 9,395 |  |  | $ 3,209 | $ 2,898 |  |
Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  | 9 years 10 months 24 days |  |  |  |  |  |  |  |
Software |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 62,371 |  |  |  |  |  |
Weighted Average Life (in years) |  | 6 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300
Atreus | Software |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 5,400 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
Weighted Average Life (in years) |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Customer Relationships, Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Customer Relationships, Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 5,300 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |
Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  | $ 7,100 |  |  | 7,073 |  |  |  |  |  |
Weighted Average Life (in years) | 8 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |
Businessfourzero | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  | $ 3,500 |
Weighted Average Life (in years) | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |
Businessfourzero | Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired | $ 500 |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Weighted Average Life (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Executive Search | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value excess by carrying value |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Executive Search | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value excess by carrying value |  |  |  |  |  |  |  |  |  | 258.00% |  |  |  |
On-Demand Talent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value excess by carrying value |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Impairment |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
On-Demand Talent | Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  | $ 62,400 |  |  |  |  |  | 62,371 |  |  |  |  |  |
On-Demand Talent | Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
On-Demand Talent | Business Talent Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  | $ 45,500 |  |  |  |  |  |  |  |  |  |
Heidrick Consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  | 7,246 |  |  |  |  |  |
Heidrick Consulting | Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Heidrick Consulting | Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill | $ 7,100 |  |  |  |  |  |  | 7,073 |  |  |  |  |  |
Executive Search | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Atreus | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Atreus | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Atreus | Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Businessfourzero | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Businessfourzero | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Executive Search | Businessfourzero | Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Executive Search | H&S Finland | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |

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