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Stock-Based Compensation - Stock Options Outstanding Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Options, Shares | shares 17,059,241
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 4 years 1 month 6 days
Outstanding Options, Weighted-Average Exercise Price $ 29.95
Exercisable Options, Shares | shares 13,856,142
Exercisable Options, Weighted-Average Exercise Price $ 27.53
Exercise Prices Range $11.02-$15.00 [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 $ 15.00
Outstanding Options, Shares | shares 1,997,288
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 2 years 1 month 6 days
Outstanding Options, Weighted-Average Exercise Price $ 11.14
Exercisable Options, Shares | shares 1,997,288
Exercisable Options, Weighted-Average Exercise Price $ 11.14
Exercise Prices Range $15.01-$20.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit of Exercise Prices 15.01
Upper range limit of Exercise Prices $ 20.00
Outstanding Options, Shares | shares 156,573
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 10 months 24 days
Outstanding Options, Weighted-Average Exercise Price $ 19.63
Exercisable Options, Shares | shares 156,573
Exercisable Options, Weighted-Average Exercise Price $ 19.63
Exercise Prices 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 1,611,033
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 3 years 1 month 6 days
Outstanding Options, Weighted-Average Exercise Price $ 23.85
Exercisable Options, Shares | shares 1,611,033
Exercisable Options, Weighted-Average Exercise Price $ 23.85
Exercise Prices 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 4,282,283
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 4 years 4 months 24 days
Outstanding Options, Weighted-Average Exercise Price $ 28.28
Exercisable Options, Shares | shares 4,282,283
Exercisable Options, Weighted-Average Exercise Price $ 28.28
Exercise Prices 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 4,929,704
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 2 years
Outstanding Options, Weighted-Average Exercise Price $ 32.45
Exercisable Options, Shares | shares 4,688,105
Exercisable Options, Weighted-Average Exercise Price $ 32.37
Exercise Prices 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 1,956,643
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 7 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 38.93
Exercisable Options, Shares | shares 340,870
Exercisable Options, Weighted-Average Exercise Price $ 36.25
Exercise Prices Range $40.01 - $44.32 [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 $ 44.32
Outstanding Options, Shares | shares 2,125,717
Outstanding Options, Weighted-Average Remaining Contractual Life (Years) 7 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 42.32
Exercisable Options, Shares | shares 779,990
Exercisable Options, Weighted-Average Exercise Price $ 41.67