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Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | $ 16,411 | $ 20,842
Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 76 | 117
On-Demand Talent |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 13,931 | 17,689
Heidrick Consulting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 2,404 | 3,036
Americas | Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 11 | 22
Europe | Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | $ 65 | $ 95

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