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Stock-Based Compensation - Options Outstanding and Exercisable (Detail)
 12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding | shares 4,023,822 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 6 months [1]
Options Outstanding, Weighted-Average Exercise Price $ 40.83 [1]
Options Exercisable | shares 2,932,022 [2]
Options Exercisable, Weighted-Average Exercise Price $ 33.67 [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 104,500 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years [1]
Options Outstanding, Weighted-Average Exercise Price $ 12.30 [1]
Options Exercisable | shares 104,500 [2]
Options Exercisable, Weighted-Average Exercise Price $ 12.30 [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 1,096,463 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years 6 months [1]
Options Outstanding, Weighted-Average Exercise Price $ 16.37 [1]
Options Exercisable | shares 1,096,463 [2]
Options Exercisable, Weighted-Average Exercise Price $ 16.37 [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 $ 65.41
Options Outstanding | shares 2,822,859 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 9 months 18 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 51.38 [1]
Options Exercisable | shares 1,731,059 [2]
Options Exercisable, Weighted-Average Exercise Price $ 45.91 [2]
[1] At December 31, 2018, the aggregate intrinsic value of options outstanding was $28.1 million.
[2] At December 31, 2018, the weighted-average remaining contractual life of options exercisable was 4.4 years and the aggregate intrinsic value of options exercisable was $28.1 million.