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Schedule of Range of Exercise Prices per Share (Detail) - Share-based Payment Arrangement, Option
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,157
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 139.48
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years
121.43 - 140.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 121.43
Range of Exercise Prices per Share, maximum $ 140.00
Shares, Stock Options Outstanding | shares 710
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 124.45
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 4 years 9 months 18 days
140.01 - 160.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 140.01
Range of Exercise Prices per Share, maximum $ 160.00
Shares, Stock Options Outstanding | shares 268
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 151.33
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years
160.01 - 180.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 160.01
Range of Exercise Prices per Share, maximum $ 180.00
Shares, Stock Options Outstanding | shares 69
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 169.37
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years 9 months 18 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 110
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 188.97
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years