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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 ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Shares outstanding, Beginning balance 2,452,000 3,023,000 4,229,000
Total Shares, Granted 0 0 25,000
Total Shares, Exercised (218,000) (539,000) (1,160,000)
Total Shares, Forfeited, canceled or expired (14,000) (32,000) (71,000)
Total Shares outstanding, Ending balance 2,220,000 2,452,000 3,023,000
Weighted Average Exercise Price per Share Outstanding, Beginning balance $ 14.83 $ 14.80 $ 14.57
Total Shares, Exercisable 2,013,000    
Weighted Average Exercise Price per Share, Granted     24.97
Total Shares, Available for issuance 1,893,000    
Weighted Average Exercise Price per Share, Exercised $ 15.97 14.51 14.03
Weighted Average Exercise Price per Share, Forfeited, canceled or expired 16.08 16.93 17.22
Weighted Average Exercise Price per Share Outstanding, Ending balance 14.71 $ 14.83 $ 14.80
Weighted Average Exercise Price per Share, Exercisable $ 14.59    
Weighted Average Remaining Contractual Term (Years), Outstanding 3 years 9 months 29 days    
Weighted Average Remaining Contractual Term (Years), Exercisable 3 years 8 months 5 days    
Aggregate Intrinsic Value, Outstanding $ 56,398    
Aggregate Intrinsic Value, Exercisable $ 51,392