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Stock-Based Compensation - Stock Options Outstanding Additional Information (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Options, Shares | shares 12,668,467
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 4 years 6 months
Outstanding Options, Weighted-Average Exercise Price $ 32.15
Exercisable Options, Shares | shares 9,647,937
Exercisable Options, Weighted-Average Exercise Price $ 27.87
Exercise Price Range $11.02-$20.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 11.02
Upper range limit of Exercise Prices $ 20.00
Outstanding Options, Shares | shares 1,562,979
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 1 year 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price $ 11.95
Exercisable Options, Shares | shares 1,562,979
Exercisable Options, Weighted-Average Exercise Price $ 11.95
Exercise Price Range $20.01-$25.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 20.01
Upper range limit of Exercise Prices $ 25.00
Outstanding Options, Shares | shares 1,363,504
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 2 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price $ 23.85
Exercisable Options, Shares | shares 1,363,504
Exercisable Options, Weighted-Average Exercise Price $ 23.85
Exercise Price Range $25.01-$30.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 25.01
Upper range limit of Exercise Prices $ 30.00
Outstanding Options, Shares | shares 3,661,570
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 3 years 4 months 24 days
Outstanding Options, Weighted-Average Exercise Price $ 28.21
Exercisable Options, Shares | shares 3,661,570
Exercisable Options, Weighted-Average Exercise Price $ 28.21
Exercise Price Range $30.01-$35.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 30.01
Upper range limit of Exercise Prices $ 35.00
Outstanding Options, Shares | shares 1,519,505
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 2 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 33.37
Exercisable Options, Shares | shares 1,519,505
Exercisable Options, Weighted-Average Exercise Price $ 33.37
Exercise Price Range $35.01-$40.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 35.01
Upper range limit of Exercise Prices $ 40.00
Outstanding Options, Shares | shares 1,534,333
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 8 years 1 month 6 days
Outstanding Options, Weighted-Average Exercise Price $ 39.49
Exercisable Options, Shares | shares 355,492
Exercisable Options, Weighted-Average Exercise Price $ 39.49
Exercise Price Range $40.01-$45.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 40.01
Upper range limit of Exercise Prices $ 45.00
Outstanding Options, Shares | shares 1,971,691
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 6 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 42.33
Exercisable Options, Shares | shares 1,184,802
Exercisable Options, Weighted-Average Exercise Price $ 41.92
Exercise Price Range $50.01-$55.01 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 50.01
Upper range limit of Exercise Prices $ 55.01
Outstanding Options, Shares | shares 1,054,885
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 9 years 1 month 6 days
Outstanding Options, Weighted-Average Exercise Price $ 54.97
Exercisable Options, Shares | shares 85
Exercisable Options, Weighted-Average Exercise Price $ 55.01