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Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | $ 20,842 | $ 6,333
Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 117 | 282
On-Demand Talent |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 17,689 | 6,051
Heidrick Consulting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 3,036 | 0
Americas | Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 22 | 51
Europe | Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | 95 | 216
Asia Pacific | Executive Search |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total other intangible assets, net | $ 0 | $ 15

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