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Stock-Based Compensation - Options Outstanding and Exercisable (Detail)
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding | shares 3,825,216 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 9 months 18 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 45.27 [1]
Options Exercisable | shares 2,668,237 [2]
Options Exercisable, Weighted-Average Exercise Price $ 41.39 [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 13.00
Range of Exercise Prices, upper limit $ 20.00
Options Outstanding | shares 623,901 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 1 year 8 months 12 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 16.74 [1]
Options Exercisable | shares 623,901 [2]
Options Exercisable, Weighted-Average Exercise Price $ 16.74 [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 20.01
Range of Exercise Prices, upper limit $ 65.41
Options Outstanding | shares 3,201,315 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 7 months 6 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 50.83 [1]
Options Exercisable | shares 2,044,336 [2]
Options Exercisable, Weighted-Average Exercise Price $ 48.91 [2]
[1] At December 31, 2019, the aggregate intrinsic value of options outstanding was $76.8 million.
[2] At December 31, 2019 the weighted-average remaining contractual life of options exercisable was 4.6 years and the aggregate intrinsic value of options exercisable was $63.9 million.