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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance | $ 2,800 |  | $ 2,800 |
Income tax expense (benefit) | $ 24,311 | $ 14,435 | $ 61,235 | $ 43,938
Effective tax rate |  |  | 25.00% | 24.90%
Excess tax benefits from stock based awards |  |  | $ 2,100 | $ 1,400
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  |  | 2017 |
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax years subject to examination |  |  | 2020 |

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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