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Summary of Range of Exercise Prices (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding | shares 8,533,561
Weighted average exercise price $ 59.05
Awards exercisable | shares 2,856,959
Weighted average exercise price $ 47.88
Range 1  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 30.01
Range of exercise prices, upper range $ 40.00
Awards outstanding | shares 369,301
Weighted average exercise price $ 36.56
Awards exercisable | shares 358,969
Weighted average exercise price $ 36.54
Range 2  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 40.01
Range of exercise prices, upper range $ 50.00
Awards outstanding | shares 1,437,708
Weighted average exercise price $ 43.02
Awards exercisable | shares 1,390,300
Weighted average exercise price $ 42.86
Range 3  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 50.01
Range of exercise prices, upper range $ 60.00
Awards outstanding | shares 4,143,205
Weighted average exercise price $ 57.54
Awards exercisable | shares 843,384
Weighted average exercise price $ 55.30
Range 4  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 60.01
Range of exercise prices, upper range $ 70.00
Awards outstanding | shares 1,293,564
Weighted average exercise price $ 68.12
Awards exercisable | shares 216,000
Weighted average exercise price $ 65.08
Range 5  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 70.01
Range of exercise prices, upper range $ 80.00
Awards outstanding | shares 588,733
Weighted average exercise price $ 73.80
Awards exercisable | shares 48,306
Weighted average exercise price $ 70.31
Range 6  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range 80.01
Range of exercise prices, upper range $ 90.00
Awards outstanding | shares 701,050
Weighted average exercise price $ 83.60