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Schedule of Range of Exercise Prices per Share (Detail) - Stock Option Awards
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,460
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 137.38
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 2 months 12 days
119.02 - 140.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 119.02
Range of Exercise Prices per Share, maximum $ 140.00
Shares, Stock Options Outstanding | shares 1,154
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 126.44
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 3 months 18 days
140.01 - 160.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 140.01
Range of Exercise Prices per Share, maximum $ 160.00
Shares, Stock Options Outstanding | shares 30
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 145.41
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years 10 months 24 days
160.01 - 180.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 160.01
Range of Exercise Prices per Share, maximum $ 180.00
Shares, Stock Options Outstanding | shares 113
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 167.75
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 5 years 10 months 24 days
180.01 - 201.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 180.01
Range of Exercise Prices per Share, maximum $ 201.25
Shares, Stock Options Outstanding | shares 163
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 192.40
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 1 month 6 days