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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,232,791,000  
Acquisitions 12,885,000  
Foreign currency translation adjustment and other (1,704,000)  
Goodwill end of period 1,243,972,000  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 501,046,000  
Acquisitions 12,885,000  
Foreign currency translation adjustment and other 349,000  
Goodwill end of period 514,280,000  
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 (592,000)  
Goodwill end of period 237,337,000  
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 (187,000)  
Goodwill end of period 268,671,000  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,811,000  
Acquisitions 0  
Foreign currency translation adjustment and other (40,000)  
Goodwill end of period 96,771,000  
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 (1,234,000)  
Goodwill end of period 126,913,000  
Accumulated impairment loss (194,100,000) (194,100,000)
Goodwill $ 321,100,000 $ 322,300,000