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Special Charges By Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Special Charges [Line Items]          
Special charges $ 10,419 $ 2,775 $ 10,846 $ 29,557 $ 29,600
Corporate Finance / Restructuring
         
Special Charges [Line Items]          
Special charges 6,331 771 6,399 11,332  
Forensic and Litigation Consulting
         
Special Charges [Line Items]          
Special charges 1,938 468 2,111 8,276  
Economic Consulting
         
Special Charges [Line Items]          
Special charges 15 173 11 991  
Technology
         
Special Charges [Line Items]          
Special charges 2 148 16 3,114  
Strategic Communications
         
Special Charges [Line Items]          
Special charges 2 201 66 4,712  
Total Reportable Segments
         
Special Charges [Line Items]          
Special charges 8,288 1,761 8,603 28,425  
Unallocated Corporate
         
Special Charges [Line Items]          
Special charges $ 2,131 $ 1,014 $ 2,243 $ 1,132