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Share-Based Compensation Stock Options Outstanding (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 808,049
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 3 years 8 months 8 days
Outstanding Options, Weighted Average Exercise Price $ 105.68
Exercisable Options, Shares | shares 464,685
Exercisable Options, Weighted Average Exercise Price $ 84.86
$42.79 - 63.62  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 42.79
Range of Exercise Prices, maximum $ 63.62
Outstanding Options, Shares | shares 52,630
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 6 months 7 days
Outstanding Options, Weighted Average Exercise Price $ 59.22
Exercisable Options, Shares | shares 52,630
Exercisable Options, Weighted Average Exercise Price $ 59.22
63.63 - 67.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 63.63
Range of Exercise Prices, maximum $ 67.77
Outstanding Options, Shares | shares 84,961
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 1 year 3 months 29 days
Outstanding Options, Weighted Average Exercise Price $ 64.37
Exercisable Options, Shares | shares 84,961
Exercisable Options, Weighted Average Exercise Price $ 64.37
67.78 - 79.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 67.78
Range of Exercise Prices, maximum $ 79.77
Outstanding Options, Shares | shares 141,026
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 2 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price $ 71.11
Exercisable Options, Shares | shares 141,026
Exercisable Options, Weighted Average Exercise Price $ 71.11
79.78 - 105.14  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 79.78
Range of Exercise Prices, maximum $ 105.14
Outstanding Options, Shares | shares 11,686
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 3 years 8 months 1 day
Outstanding Options, Weighted Average Exercise Price $ 98.17
Exercisable Options, Shares | shares 7,336
Exercisable Options, Weighted Average Exercise Price $ 96.09
105.15 - 105.84  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 105.15
Range of Exercise Prices, maximum $ 105.84
Outstanding Options, Shares | shares 154,345
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 5 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price $ 105.18
Exercisable Options, Shares | shares 31,958
Exercisable Options, Weighted Average Exercise Price $ 105.18
105.85 - 108.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 105.85
Range of Exercise Prices, maximum $ 108.59
Outstanding Options, Shares | shares 148,456
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 3 years 3 months 27 days
Outstanding Options, Weighted Average Exercise Price $ 107.96
Exercisable Options, Shares | shares 101,824
Exercisable Options, Weighted Average Exercise Price $ 107.95
108.60 - 149.65  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 108.60
Range of Exercise Prices, maximum $ 149.65
Outstanding Options, Shares | shares 102,306
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 4 years 3 months 8 days
Outstanding Options, Weighted Average Exercise Price $ 128.65
Exercisable Options, Shares | shares 44,950
Exercisable Options, Weighted Average Exercise Price $ 128.13
149.66 - 180.62  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 149.66
Range of Exercise Prices, maximum $ 180.62
Outstanding Options, Shares | shares 108,266
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 6 years 4 months 3 days
Outstanding Options, Weighted Average Exercise Price $ 178.15
Exercisable Options, Shares | shares 0
Exercisable Options, Weighted Average Exercise Price $ 0.00
180.63 - 217.69  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 180.63
Range of Exercise Prices, maximum $ 217.69
Outstanding Options, Shares | shares 4,373
Outstanding Options ,Weighted Average Remaining Contractual Life in Years 6 years 9 months 17 days
Outstanding Options, Weighted Average Exercise Price $ 210.42
Exercisable Options, Shares | shares 0
Exercisable Options, Weighted Average Exercise Price $ 0.00