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Goodwill and Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]      
Goodwill beginning of period $ 1,227,593,000 $ 1,232,791,000  
Acquisitions   11,332,000  
Foreign currency translation adjustment 6,976,000 (16,530,000)  
Intersegment transfers in/(out) 0    
Goodwill end of period 1,234,569,000 1,227,593,000  
Corporate Finance      
Goodwill [Roll Forward]      
Goodwill beginning of period 516,500,000 501,046,000  
Acquisitions   11,332,000  
Foreign currency translation adjustment 1,405,000 4,122,000  
Intersegment transfers in/(out) 23,086,000    
Goodwill end of period 540,991,000 516,500,000  
Accumulated impairment loss 0 0 $ 0
FLC      
Goodwill [Roll Forward]      
Goodwill beginning of period 234,872,000 237,929,000  
Acquisitions   0  
Foreign currency translation adjustment 1,629,000 (3,057,000)  
Intersegment transfers in/(out) (23,086,000)    
Goodwill end of period 213,415,000 234,872,000  
Accumulated impairment loss 0 0 0
Economic Consulting      
Goodwill [Roll Forward]      
Goodwill beginning of period 268,055,000 268,858,000  
Acquisitions   0  
Foreign currency translation adjustment 427,000 (803,000)  
Intersegment transfers in/(out) 0    
Goodwill end of period 268,482,000 268,055,000  
Accumulated impairment loss 0 0 0
Technology      
Goodwill [Roll Forward]      
Goodwill beginning of period 96,727,000 96,811,000  
Acquisitions   0  
Foreign currency translation adjustment 75,000 (84,000)  
Intersegment transfers in/(out) 0    
Goodwill end of period 96,802,000 96,727,000  
Accumulated impairment loss 0 0 0
Strategic Communications      
Goodwill [Roll Forward]      
Goodwill beginning of period 111,439,000 128,147,000  
Acquisitions   0  
Foreign currency translation adjustment 3,440,000 (16,708,000)  
Intersegment transfers in/(out) 0    
Goodwill end of period 114,879,000 111,439,000  
Accumulated impairment loss 194,100,000 194,100,000 194,100,000
Goodwill $ 309,000,000 $ 305,600,000 $ 322,300,000