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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,227,593,000  
Foreign currency translation adjustment and other 2,474,000  
Goodwill end of period 1,230,067,000  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 516,500,000  
Foreign currency translation adjustment and other 147,000  
Goodwill end of period 516,647,000  
Accumulated impairment loss 0 $ 0
Forensic and Litigation Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 234,872,000  
Foreign currency translation adjustment and other 713,000  
Goodwill end of period 235,585,000  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,055,000  
Foreign currency translation adjustment and other 194,000  
Goodwill end of period 268,249,000  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,727,000  
Foreign currency translation adjustment and other 0  
Goodwill end of period 96,727,000  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 111,439,000  
Foreign currency translation adjustment and other 1,420,000  
Goodwill end of period 112,859,000  
Accumulated impairment loss 194,100,000 194,100,000
Goodwill $ 307,000,000 $ 305,600,000