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Acquisitions (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2023 | Feb. 01, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2023 | Feb. 28, 2023 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  |  |  |  |  | $ 49,858 | $ 0 | $ 33,518 |  |  |
Goodwill |  |  | $ 202,252 |  |  |  | 202,252 | $ 138,361 | $ 138,524 |  |  | $ 91,643
Impairment |  |  |  |  |  |  | 7,246 |  |  |  |  |
Heidrick Consulting Reporting Units |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  | $ 7,200 |  | 7,200 |  |  |  |  |
Atreus |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  | $ 12,100 |  |  | $ 33,400 |  |  |  |  |  |
Future consideration, minimum |  | $ 30,000 |  |  |  |  |  |  |  |  |  |
Future consideration, maximum |  | 40,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 62,400 |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  |  |  | 70,400 |  |  |  |  |
Operating loss of acquiree since acquisition |  |  |  |  |  |  | 7,900 |  |  |  |  |
Atreus | Acqusition Earnout Accruals | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition earnout accrued |  | 32,000 |  |  |  |  |  |  |  |  |  |
Atreus | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | 11,300 |  |  |  |  |  |  |  |  |  |
Atreus | Software |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | 5,400 |  |  |  |  |  |  |  |  |  |
Atreus | Trade name |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 2,500 |  |  |  |  |  |  |  |  | $ 2,500 |
Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  |  | $ 2,200 | $ 9,500 |  |  |  |  |  |  |
Future consideration, minimum | $ 4,000 |  |  |  |  |  |  |  |  |  |  |
Future consideration, maximum | 8,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 7,100 |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  |  |  | 11,200 |  |  |  |  |
Operating loss of acquiree since acquisition |  |  |  |  |  |  | $ 11,000 |  |  |  |  |
Businessfourzero | Acqusition Earnout Accruals | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition earnout accrued | 4,300 |  |  |  |  |  |  |  |  |  |  |
Businessfourzero | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired | 3,500 |  |  |  |  |  |  |  |  | $ 3,500 |  |
Businessfourzero | Trade name |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired | $ 500 |  |  |  |  |  |  |  |  | $ 500 |  |

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