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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Goodwill beginning of period $ 1,232,791,000  
Acquisitions 11,095,000  
Foreign currency translation adjustment and other (16,049,000)  
Goodwill end of period 1,227,837,000  
Corporate Finance & Restructuring    
Goodwill [Roll Forward]    
Goodwill beginning of period 501,046,000  
Acquisitions 11,095,000  
Foreign currency translation adjustment and other (5,375,000)  
Goodwill end of period 506,766,000  
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 (3,001,000)  
Goodwill end of period 234,928,000  
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 (723,000)  
Goodwill end of period 268,135,000  
Accumulated impairment loss 0 0
Technology    
Goodwill [Roll Forward]    
Goodwill beginning of period 96,811,000  
Acquisitions 0  
Foreign currency translation adjustment and other (148,000)  
Goodwill end of period 96,663,000  
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 (6,802,000)  
Goodwill end of period 121,345,000  
Accumulated impairment loss 194,100,000 194,100,000
Goodwill $ 315,500,000 $ 322,300,000