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Share-Based Compensation - Additional Information (Detail) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period     307 511
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period. Weighted average fair value     $ 113.82 $ 74.21
Share-based compensation arrangement by share-based payment award, award vesting period     3 years 3 years
Share-based compensation arrangement by share-based payment award, award vesting percentage     100.00% 100.00%
Restricted Stock Units (RSUs) | Non-Employee Directors        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period     13 19
Performance Stock Units (PSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period     75 95
Share-based compensation arrangement by share-based payment award, award vesting percentage     100.00% 100.00%
Maximum adjustment factor     200.00% 200.00%
Minimum adjustment factor     50.00% 50.00%
Minimum shares issued     0 0
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock issued during period, shares, employee stock purchase plans 698 677 698 677
Fair value of the employee stock purchase rights granted     $ 28.55 $ 23.26