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Special Charges - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Employee
Location
Jun. 30, 2011
Jun. 30, 2012
Employee
Jun. 30, 2011
Special Charges [Line Items]        
Special charges $ 26,782,000 $ 15,212,000 $ 26,782,000 $ 15,212,000
Number of employees terminated 116      
Number of office locations 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     22,200,000  
Cash outflow associated with special charges, amount paid     1,100,000  
Cash outflow associated with special charges, amount expected to be paid in remainder of fiscal year     9,400,000  
Cash outflow associated with special charges, amount expected to be paid in 2013     5,100,000  
Cash outflow associated with special charges, amount expected to be paid in 2014     2,400,000  
Cash outflow associated with special charges, amount expected to be paid from 2015 to 2025     4,200,000  
Cash outflow associated with special charges, amount expected to be paid in remainder of fiscal year 2012     900,000  
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