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Schedule of Range of Exercise Prices per Share (Detail) - Stock Option Awards
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares, Stock Options Outstanding | shares 1,230
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 265.00
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 6 years 3 months 18 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 938
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 137.41
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 5 years 3 months 18 days
400.01 - 500.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices per Share, minimum $ 400.01
Range of Exercise Prices per Share, maximum $ 500.00
Shares, Stock Options Outstanding | shares 20
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 470.00
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years 8 months 12 days
600.01 - 691.23  
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 $ 691.23
Shares, Stock Options Outstanding | shares 272
Weighted Average Exercise Price Per Share, Stock Options Outstanding $ 689.84
Weighted Average Remaining Contractual Term (Years), Stock Options Outstanding 9 years 4 months 24 days