v3.26.3
Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,242,777  
Foreign currency translation adjustment (2,827)  
Goodwill end of period 1,239,950  
Corporate Finance    
Goodwill [Roll Forward]    
Goodwill beginning of period 543,243  
Foreign currency translation adjustment (802)  
Goodwill end of period 542,441  
Accumulated impairment loss 0 $ 0
FLC    
Goodwill [Roll Forward]    
Goodwill beginning of period 215,174  
Foreign currency translation adjustment (697)  
Goodwill end of period 214,477  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,920  
Foreign currency translation adjustment (186)  
Goodwill end of period 268,734  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,887  
Foreign currency translation adjustment (29)  
Goodwill end of period 96,858  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 118,553  
Foreign currency translation adjustment (1,113)  
Goodwill end of period 117,440  
Accumulated impairment loss 194,100 194,100
Goodwill $ 311,600 $ 312,700