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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,234,569  
Foreign currency translation adjustment 5,711  
Goodwill end of period 1,240,280  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 540,991  
Foreign currency translation adjustment 1,371  
Goodwill end of period 542,362  
Accumulated impairment loss 0 $ 0
Forensic and Litigation Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 213,415  
Foreign currency translation adjustment 1,140  
Goodwill end of period 214,555  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,482  
Foreign currency translation adjustment 271  
Goodwill end of period 268,753  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,802  
Foreign currency translation adjustment 70  
Goodwill end of period 96,872  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 114,879  
Foreign currency translation adjustment 2,859  
Goodwill end of period 117,738  
Accumulated impairment loss 194,100 194,100
Goodwill $ 311,900 $ 309,000