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Income Taxes - Components of Provision for Income Taxes and Income before Provision for Income Taxes (Detail)

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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
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Income tax expense at the federal statutory rate, amount $ 4,431 $ 3,987
State income tax expense, net of federal benefit, amount 1,048 1,018
Windfall tax benefits, net related to stock-based compensation, amount (27) (17)
Change in valuation allowance, amount 180 367
Permanent and other items, amount 454 562
Provision for income taxes, amount $ 6,086 $ 5,917
Income tax expense at the federal statutory rate, rate 21.00% 21.00%
State income tax expense, net of federal benefit, rate 5.00% 5.40%
Windfall tax benefits, net related to stock-based compensation, rate (0.10%) (0.10%)
Change in valuation allowance, rate 0.90% 1.90%
Permanent and other items, rate 2.00% 3.00%
Provision for income taxes, rate 28.80% 31.20%