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Summary of Range of Exercise Prices (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding | shares 7,337,266
Weighted average exercise price $ 64.90
Awards exercisable | shares 3,026,721
Weighted average exercise price $ 56.83
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 16,000
Weighted average exercise price $ 39.89
Awards exercisable | shares 16,000
Weighted average exercise price $ 39.89
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 267,621
Weighted average exercise price $ 44.44
Awards exercisable | shares 267,621
Weighted average exercise price $ 44.44
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 3,489,398
Weighted average exercise price $ 57.53
Awards exercisable | shares 2,420,035
Weighted average exercise price $ 56.84
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 1,306,049
Weighted average exercise price $ 67.46
Awards exercisable | shares 232,816
Weighted average exercise price $ 65.04
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 1,581,487
Weighted average exercise price $ 74.76
Awards exercisable | shares 50,806
Weighted average exercise price $ 70.44
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 676,711
Weighted average exercise price $ 83.60
Awards exercisable | shares 39,443
Weighted average exercise price $ 81.51