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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) reportingUnit | Sep. 30, 2023 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of reporting units | reportingUnit |  |  | 5 |
Impairment |  |  | $ 16,224 |
On-Demand Talent Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment | $ 14,800 |  | 14,800 |
Europe Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment | $ 1,500 |  | $ 1,500 |
Heidrick Consulting Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment |  | $ 7,200 |  | $ 7,200

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