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Schedule of Range of Exercise Prices per Share (Detail) - Stock Option Awards
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,490
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 138.87
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 3 months 18 days
117.85 - 120.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 117.85
Range of Exercise Prices per Share, maximum $ 120.00
Shares, Stock Options Outstanding | shares 23
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 118.50
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 3 years 3 months 18 days
120.01 - 150.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 120.01
Range of Exercise Prices per Share, maximum $ 150.00
Shares, Stock Options Outstanding | shares 1,124
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 126.78
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 8 months 12 days
150.01 - 180.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 150.01
Range of Exercise Prices per Share, maximum $ 180.00
Shares, Stock Options Outstanding | shares 173
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 167.40
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 4 years 2 months 12 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 170
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 192.44
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 7 months 6 days