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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
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