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Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 15,110 $ 20,842
Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 61 117
On-Demand Talent    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 12,789 17,689
Heidrick Consulting    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 2,260 3,036
Americas | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 7 22
Europe | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 54 $ 95