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Share-Based Compensation Plans - 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
 3 Months Ended
Mar. 31, 2014
Employee Stock Option [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares outstanding, Beginning balance 3,023
Total Shares, Granted   
Total Shares, Exercised (396)
Total Shares, Forfeited, canceled or expired (4)
Total Shares outstanding, Ending balance 2,623
Total Shares, Exercisable 1,997
Total Shares, Available for issuance 2,102
Weighted Average Exercise Price per Share Outstanding, Beginning balance $ 14.80
Weighted Average Exercise Price per Share, Granted   
Weighted Average Exercise Price per Share, Exercised $ 13.59
Weighted Average Exercise Price per Share, Forfeited, canceled or expired $ 17.33
Weighted Average Exercise Price per Share Outstanding, Ending balance $ 14.98
Weighted Average Exercise Price per Share, Exercisable $ 14.29
Weighted Average Remaining Contractual Term (Years), Outstanding 5 years 7 months 28 days
Weighted Average Remaining Contractual Term (Years), Exercisable 5 years 3 months 29 days
Aggregate Intrinsic Value, Outstanding $ 83,192
Aggregate Intrinsic Value, Exercisable $ 64,731