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Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Abstract] |  |
Provision for income taxes | $ 76,327 | $ 51,182
Increase in income taxes due to decrease of pre-tax book income | $ 25,100 |
Effective tax rate | 22.10% | 22.80%
Federal statutory tax rate | 21.00% |
Unrecognized tax benefits | $ 166,800 |
Decrease in unrecognized tax benefits | 1,700 |
Change in unrecognized tax benefits | 3,100 |
Unrecognized tax benefits expiration of statute of limitations in various tax jurisdictions | $ 4,800 |

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