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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 202,252  
Foreign currency translation (2,163)  
Goodwill, ending balance 200,089  
Accumulated impairment losses (7,246) $ (7,246)
Goodwill, gross 207,335 209,498
Executive Search    
Goodwill [Roll Forward]    
Goodwill, gross 93,007 93,234
On-Demand Talent    
Goodwill [Roll Forward]    
Goodwill, beginning balance 109,018  
Foreign currency translation (1,936)  
Goodwill, ending balance 107,082  
Accumulated impairment losses 0 0
Goodwill, gross 107,082 109,018
Heidrick Consulting    
Goodwill [Roll Forward]    
Goodwill, beginning balance 0  
Foreign currency translation 0  
Goodwill, ending balance 0  
Accumulated impairment losses (7,246) (7,246)
Goodwill, gross 7,246 7,246
Americas | Executive Search    
Goodwill [Roll Forward]    
Goodwill, beginning balance 91,740  
Foreign currency translation (193)  
Goodwill, ending balance 91,547  
Accumulated impairment losses 0 0
Goodwill, gross 91,547 91,740
Europe | Executive Search    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,494  
Foreign currency translation (34)  
Goodwill, ending balance 1,460  
Accumulated impairment losses 0 0
Goodwill, gross $ 1,460 $ 1,494