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Special Charges By Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Special Charges [Line Items]        
Special charges $ 5,347 $ 10,419 $ 14,711 $ 10,846
Operating Segments
       
Special Charges [Line Items]        
Special charges 426 8,288 426 8,603
Operating Segments | Corporate Finance / Restructuring
       
Special Charges [Line Items]        
Special charges 84 6,331 84 6,399
Operating Segments | Forensic and Litigation Consulting
       
Special Charges [Line Items]        
Special charges 308 1,938 308 2,111
Operating Segments | Economic Consulting
       
Special Charges [Line Items]        
Special charges 12 15 12 11
Operating Segments | Technology
       
Special Charges [Line Items]        
Special charges 19 2 19 16
Operating Segments | Strategic Communications
       
Special Charges [Line Items]        
Special charges 3 2 3 66
Unallocated Corporate
       
Special Charges [Line Items]        
Special charges $ 4,921 $ 2,131 $ 14,285 $ 2,243