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Special Charges - Schedule Of Special Charges By Segment (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Special charges $ 0 $ 0 $ 0 $ 30,074,000
Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 26,830,000
Unallocated Corporate        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 3,244,000
Corporate Finance & Restructuring | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 3,049,000
Forensic and Litigation Consulting | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 10,445,000
Economic Consulting | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 5,910,000
Technology | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     0 3,827,000
Strategic Communications | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Special charges     $ 0 $ 3,599,000