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Range of Exercise Prices (Detail)
shares in Thousands
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 915
Weighted Average Exercise Price $ 145.11
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 years
117.85 - 120.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price per Share, minimum $ 117.85
Range of Exercise Price per Share, maximum $ 120.00
Shares, Stock Options Outstanding | shares 30
Weighted Average Exercise Price $ 118.63
Weighted Average Remaining Contractual Term, Stock Options Outstanding 7 years 7 months 6 days
120.01 - 150.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price per Share, minimum $ 120.01
Range of Exercise Price per Share, maximum $ 150.00
Shares, Stock Options Outstanding | shares 514
Weighted Average Exercise Price $ 121.43
Weighted Average Remaining Contractual Term, Stock Options Outstanding 7 years 7 months 6 days
150.01 - 180.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price per Share, minimum $ 150.01
Range of Exercise Price per Share, maximum $ 180.00
Shares, Stock Options Outstanding | shares 216
Weighted Average Exercise Price $ 167.21
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 years 4 months 24 days
180.01 - 201.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price per Share, minimum $ 180.01
Range of Exercise Price per Share, maximum $ 201.25
Shares, Stock Options Outstanding | shares 155
Weighted Average Exercise Price $ 197.87
Weighted Average Remaining Contractual Term, Stock Options Outstanding 9 years 2 months 12 days