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Schedule of Range of Exercise Prices per Share (Detail) - Stock Option Awards
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,273
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 259.39
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years 8 months 12 days
121.43 - 200.00  
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 $ 200.00
Shares, Stock Options Outstanding | shares 994
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 137.74
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 5 years 9 months 18 days
600.01 - 700.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 600.01
Range of Exercise Prices per Share, maximum $ 700.00
Shares, Stock Options Outstanding | shares 276
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 691.23
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years 10 months 24 days
700.01 - 756.55  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 700.01
Range of Exercise Prices per Share, maximum $ 756.55
Shares, Stock Options Outstanding | shares 3
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 756.55
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years 10 months 24 days