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Stock Awards - Additional Information (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Time-Based Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share - based compensation ,shares issued 240,425 275,464
Stock awards vesting period in years 3 years  
Performance-Based Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share - based compensation ,shares issued 204,255 252,566
Stock awards vesting period in years 3 years  
Multi-Year Performance-Based Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share - based compensation ,shares issued 550,000 649,793
Stock awards vesting period in years 3 years  
Equity Incentive Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved shares of common stock for awards under the Equity Incentive Plan 7,395,132  
Common stock remaining for future stock awards 495,132  
Common stock remaining for future stock awards transferred to the equity incentive plan 7,395,132