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Goodwill and Other Intangible Assets - Goodwill by Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill $ 197,711 $ 138,361
Executive Search    
Goodwill [Line Items]    
Goodwill 92,995 92,832
Executive Search | Americas    
Goodwill [Line Items]    
Goodwill 91,527 91,383
Executive Search | Europe    
Goodwill [Line Items]    
Goodwill 1,468 1,449
On-Demand Talent    
Goodwill [Line Items]    
Goodwill $ 104,716 $ 45,529