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Stock-Based Compensation Expense - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) group $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of groups within the employee population | group | 2 |  |
Estimated forfeiture rate for unvested options for senior management | 7.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management | 12.00% |  |
Increase in compensation expense due to revised estimated forfeiture rates | $ 1,787,000 | $ 499,000 | $ 1,283,000
Weighted-average grant-date fair values of stock options granted | $ / shares | $ 19.62 | $ 18.62 | $ 20.84
Total intrinsic values of stock options exercised | $ 166,796,000 | $ 90,762,000 | $ 52,629,000
Total fair values of stock options vested | 45,998,000 | 38,974,000 | 31,106,000
Total unrecognized compensation expense related to non-vested stock options | $ 51,825,000 |  |
Recognition period for unrecognized compensation expense | 1 year 8 months 12 days |  |
Stock-based compensation expense | $ 42,661,000 | 45,589,000 | 41,090,000
Income tax benefit recognized related to stock-based compensation expense | 6,569,000 | 7,756,000 | 7,317,000
Compensation expense capitalized | 0 | $ 0 | $ 0
Stock-based compensation expense and the related income tax benefit recognized, credits | $ 1,401,000 |  |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant under stock option plans | shares | 16,260,393 |  |
Vesting period for stock option plans |  |  |
Expiration period of stock option plan | 10 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, weighted-average exercise price | $ / shares |  | $ 48.61 | $ 0
Vested (in shares) | shares | 0 | 0 | 0
Minimum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 4 years |  |
Minimum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 3 years |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 5 years |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 3 years |  |

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