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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail) (Employee Stock Option [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Employee Stock Option [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total Shares outstanding, Beginning balance 4,229  
Total Shares, Granted 25 0
Total Shares, Exercised (1,070)  
Total Shares, Forfeited, canceled or expired (33)  
Total Shares outstanding, Ending balance 3,151 4,229
Total Shares, Exercisable 1,673  
Total Shares, Available for issuance 2,251  
Weighted Average Exercise Price per Share Outstanding, Beginning balance $ 14.57  
Weighted Average Exercise Price per Share, Granted $ 24.97  
Weighted Average Exercise Price per Share, Exercised $ 13.85  
Weighted Average Exercise Price per Share, Forfeited, canceled or expired $ 16.37  
Weighted Average Exercise Price per Share Outstanding, Ending balance $ 14.88 $ 14.57
Weighted Average Exercise Price per Share, Exercisable $ 14.17  
Weighted Average Remaining Contractual Term (Years), Outstanding 6 years 1 month 6 days  
Weighted Average Remaining Contractual Term (Years), Exercisable 5 years 8 months 23 days  
Aggregate Intrinsic Value, Outstanding $ 79,918  
Aggregate Intrinsic Value, Exercisable $ 43,616