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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,226,556  
Foreign currency translation adjustment 5,102  
Goodwill end of period 1,231,658  
Corporate Finance    
Goodwill [Roll Forward]    
Goodwill beginning of period 535,328  
Foreign currency translation adjustment 1,928  
Goodwill end of period 537,256  
Accumulated impairment loss 0 $ 0
FLC    
Goodwill [Roll Forward]    
Goodwill beginning of period 212,367  
Foreign currency translation adjustment 1,073  
Goodwill end of period 213,440  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,294  
Foreign currency translation adjustment 194  
Goodwill end of period 268,488  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,784  
Foreign currency translation adjustment 42  
Goodwill end of period 96,826  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 113,783  
Foreign currency translation adjustment 1,865  
Goodwill end of period 115,648  
Accumulated impairment loss 194,100 194,100
Goodwill $ 309,800 $ 307,900