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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,232,791,000  
Acquisitions 11,332,000  
Foreign currency translation adjustment and other (31,582,000)  
Goodwill end of period 1,212,541,000  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 501,046,000  
Acquisitions 11,332,000  
Foreign currency translation adjustment and other (2,026,000)  
Goodwill end of period 510,352,000  
Accumulated impairment loss 0 $ 0
Forensic and Litigation Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 237,929,000  
Acquisitions 0  
Foreign currency translation adjustment and other (5,870,000)  
Goodwill end of period 232,059,000  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 268,858,000  
Acquisitions 0  
Foreign currency translation adjustment and other (1,612,000)  
Goodwill end of period 267,246,000  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,811,000  
Acquisitions 0  
Foreign currency translation adjustment and other (61,000)  
Goodwill end of period 96,750,000  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 128,147,000  
Acquisitions 0  
Foreign currency translation adjustment and other (22,013,000)  
Goodwill end of period 106,134,000  
Accumulated impairment loss 194,100,000 194,100,000
Goodwill $ 300,300,000 $ 322,300,000