v3.25.3
Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,226,556  
Foreign currency translation adjustment 14,866  
Goodwill end of period 1,241,422  
Corporate Finance    
Goodwill [Roll Forward]    
Goodwill beginning of period 535,328  
Foreign currency translation adjustment 7,026  
Goodwill end of period 542,354  
Accumulated impairment loss 0 $ 0
FLC    
Goodwill [Roll Forward]    
Goodwill beginning of period 212,367  
Foreign currency translation adjustment 2,714  
Goodwill end of period 215,081  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,294  
Foreign currency translation adjustment 596  
Goodwill end of period 268,890  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,784  
Foreign currency translation adjustment 97  
Goodwill end of period 96,881  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 113,783  
Foreign currency translation adjustment 4,433  
Goodwill end of period 118,216  
Accumulated impairment loss 194,100 194,100
Goodwill $ 312,400 $ 307,900