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Share-Based Compensation Plans - Summary of Non-Vested Options (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Number of shares, granted 596,995
Non-Vested Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Number of shares, outstanding, beginning balance 3,154,384
Number of shares, granted 599,745
Number of shares, forfeited (2,200)
Number of shares, outstanding, ending balance 3,026,766
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average exercise price, outstanding (usd per share), beginning balance | $ / shares $ 12.59
Weighted-average exercise price, granted (usd per share) | $ / shares 23.36
Weighted-average exercise price, forfeited (usd per share) | $ / shares 17.65
Weighted-average exercise price, outstanding (usd per share), ending balance | $ / shares $ 15.53
Vested Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Number of shares, vested (725,163)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average exercise price, vested (usd per share) | $ / shares $ 12.50