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Stock-Based Compensation - Options Outstanding and Exercisable (Detail)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding | shares 4,815,291 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 7 months 6 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 27.34 [1]
Options Exercisable | shares 3,675,904 [2]
Options Exercisable, Weighted-Average Exercise Price $ 20.78 [2]
Exercise Price Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit 9.00
Range of Exercise Prices, upper limit $ 12.99
Options Outstanding | shares 900,898 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years 9 months 18 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 11.25 [1]
Options Exercisable | shares 900,898 [2]
Options Exercisable, Weighted-Average Exercise Price $ 11.25 [2]
Exercise Price Range Two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit 13.00
Range of Exercise Prices, upper limit $ 20.00
Options Outstanding | shares 1,824,173 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 6 months [1]
Options Outstanding, Weighted-Average Exercise Price $ 15.78 [1]
Options Exercisable | shares 1,824,173 [2]
Options Exercisable, Weighted-Average Exercise Price $ 15.78 [2]
Exercise Price Range Three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit 20.01
Range of Exercise Prices, upper limit $ 50.22
Options Outstanding | shares 2,090,220 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 9 months 18 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 44.37 [1]
Options Exercisable | shares 950,833 [2]
Options Exercisable, Weighted-Average Exercise Price $ 39.40 [2]
[1] At December 31, 2016, the aggregate intrinsic value of options outstanding was $125.8 million.
[2] At December 31, 2016, the weighted-average remaining contractual life of options exercisable was 4.7 years and the aggregate intrinsic value of options exercisable was $120.1 million.