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Special Charges - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Location
Jun. 30, 2012
Employee
Location
Jun. 30, 2011
Sep. 30, 2012
Employee
Sep. 30, 2011
Special Charges [Line Items]          
Special charges $ 2,775,000   $ 15,200,000 $ 29,557,000 $ 15,212,000
Non cash special charges 400,000        
Number of employees terminated   116      
Number of office locations 3 6      
Number of employees included in the reduction in workforce related to the special charges recorded in the period       116  
Total expected cash outflow associated with special charges       24,600,000  
Cash outflow associated with special charges, amount paid       7,500,000  
Cash outflow associated with special charges, amount expected to be paid in remainder of fiscal year       3,500,000  
Cash outflow associated with special charges, amount expected to be paid in 2013       5,900,000  
Cash outflow associated with special charges, amount expected to be paid in 2014       2,600,000  
Cash outflow associated with special charges, amount expected to be paid from 2015 to 2025       5,100,000  
Cash outflow associated with special charges, amount expected to be paid in remainder of fiscal year 2012       300,000  
Salary Continuance And Other Contractual Employee Related Costs
          
Special Charges [Line Items]          
Special charges       18,400,000  
Lease Termination
          
Special Charges [Line Items]          
Special charges       8,400,000  
Number of office locations       6  
Business Realignments
          
Special Charges [Line Items]          
Special charges   26,800,000      
Non cash special charges   4,600,000