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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,234,879,000  
Acquisitions 5,493,000  
Foreign currency translation adjustment and other (6,349,000)  
Goodwill end of period 1,234,023,000  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 506,072,000  
Acquisitions 0  
Foreign currency translation adjustment and other (4,149,000)  
Goodwill end of period 501,923,000  
Accumulated impairment loss 0 $ 0
FLC    
Goodwill [Roll Forward]    
Goodwill beginning of period 233,374,000  
Acquisitions 5,493,000  
Foreign currency translation adjustment and other (680,000)  
Goodwill end of period 238,187,000  
Accumulated impairment loss 0 0
Economic Consulting    
Goodwill [Roll Forward]    
Goodwill beginning of period 269,087,000  
Acquisitions 0  
Foreign currency translation adjustment and other (168,000)  
Goodwill end of period 268,919,000  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,821,000  
Acquisitions 0  
Foreign currency translation adjustment and other (11,000)  
Goodwill end of period 96,810,000  
Accumulated impairment loss 0 0
Strategic Communications    
Goodwill [Roll Forward]    
Goodwill beginning of period 129,525,000  
Acquisitions 0  
Foreign currency translation adjustment and other (1,341,000)  
Goodwill end of period 128,184,000  
Accumulated impairment loss 194,100,000 194,100,000
Goodwill $ 322,300,000 $ 323,700,000