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Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets, Net by Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 8,949 $ 12,483
Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 11 42
On-Demand Talent    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 7,633 10,592
Heidrick Consulting    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 1,305 1,849
Americas | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net 0 5
Europe | Executive Search    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, net $ 11 $ 37