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Income Taxes - Components of Provision for Income Taxes and Income before Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |
Income tax expense at the federal statutory rate, amount | $ 3,987 | $ 4,472
State income tax expense, net of federal benefit, amount | 1,018 | 894
Windfall tax benefits, net related to stock-based compensation, amount | (17) | (265)
Change in valuation allowance, amount | 367 | 259
Permanent and other items, amount | 562 | 297
Provision for income taxes, amount | $ 5,917 | $ 5,657
Income tax expense at the federal statutory rate, rate | 21.00% | 21.00%
State income tax expense, net of federal benefit, rate | 5.40% | 4.20%
Windfall tax benefits, net related to stock-based compensation, rate | (0.10%) | (1.20%)
Change in valuation allowance, rate | 1.90% | 1.20%
Permanent and other items, rate | 3.00% | 1.40%
Provision for income taxes, rate | 31.20% | 26.60%

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