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Range of Exercise Prices (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,323
Weighted Average Exercise Price $ 129.04
Weighted Average Remaining Contractual Term, Stock Options Outstanding 8 years 4 months 24 days
92.84 - 120.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price per Share, minimum $ 92.84
Range of Exercise Price per Share, maximum $ 120.00
Shares, Stock Options Outstanding | shares 432
Weighted Average Exercise Price $ 94.78
Weighted Average Remaining Contractual Term, Stock Options Outstanding 7 years 8 months 12 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 3 months 18 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 247
Weighted Average Exercise Price $ 166.91
Weighted Average Remaining Contractual Term, Stock Options Outstanding 9 years 1 month 6 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 8 months 12 days