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Stock Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation $ 3,000,000 $ 2,784,000 $ 9,713,000 $ 8,622,000
RSUs
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation     1,700,000  
Total stock-based compensation, period of recognition     1 year  
Unrecognized stock-based compensation expense 12,200,000   12,200,000  
Weighted-average period of recognition of unrecognized stock-based compensation expense (in years)     2 years 1 month 6 days  
RSUs | Corporate Incentive Compensation Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of units expected to vest     114,000  
Restricted stock units, fair value     $ 3,300,000  
Issued to employees     59,000  
Compensation percentage of target incentive compensation eligible to be elected and received by employees     50.00%  
Employees | Stock Compensation Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     344,000  
Non-employee directors | Stock Compensation Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     14,000