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Schedule of Range of Exercise Prices per Share (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,463
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 140.83
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 7 years 10 months 24 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 25
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 118.55
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years 1 month 6 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 1,045
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 126.78
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 8 years
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 198
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 167.55
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 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 195
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 191.78
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 8 years 4 months 24 days