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Stock-Based Compensation - Options Outstanding and Exercisable (Detail)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding | shares 6,199,526 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 4 months 24 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 20.74 [1]
Options Exercisable | shares 5,091,374 [2]
Options Exercisable, Weighted-Average Exercise Price $ 15.57 [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 2,391,073 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 4 months 24 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 11.02 [1]
Options Exercisable | shares 2,391,073 [2]
Options Exercisable, Weighted-Average Exercise Price $ 11.02 [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 2,191,678 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 6 months [1]
Options Outstanding, Weighted-Average Exercise Price $ 15.64 [1]
Options Exercisable | shares 2,191,678 [2]
Options Exercisable, Weighted-Average Exercise Price $ 15.64 [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 $ 47.87
Options Outstanding | shares 1,616,775 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 8 years 2 months 12 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 42.02 [1]
Options Exercisable | shares 508,623 [2]
Options Exercisable, Weighted-Average Exercise Price $ 36.66 [2]
[1] At December 31, 2015, the aggregate intrinsic value of options outstanding was $215.5 million.
[2] At December 31, 2015, the weighted-average remaining contractual life of options exercisable was 4.7 years and the aggregate intrinsic value of options exercisable was $203.3 million.