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Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 18,305 $ 20,842
Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 96 117
On-Demand Talent    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 15,541 17,689
Heidrick Consulting    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 2,668 3,036
Americas | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 17 22
Europe | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 79 $ 95