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Range of Exercise Prices (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 896
Weighted Average Exercise Price $ 144.13
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 years 6 months
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 32
Weighted Average Exercise Price $ 118.66
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 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 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 8 years 1 month 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 220
Weighted Average Exercise Price $ 167.17
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 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 Price per Share, minimum $ 180.01
Range of Exercise Price per Share, maximum $ 201.25
Shares, Stock Options Outstanding | shares 130
Weighted Average Exercise Price $ 201.25
Weighted Average Remaining Contractual Term, Stock Options Outstanding 9 years 4 months 24 days