Annual report pursuant to Section 13 and 15(d)

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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax expense at the federal statutory rate, amount $ 12,466 $ 22,578 $ 24,616
State income tax expense, net of federal benefit, amount 2,983 5,698 4,550
Windfall tax benefits, net related to stock-based compensation, amount 240 (196) (1,535)
Change in valuation allowance, amount 497 1,351 677
Permanent and other items, amount 340 1,151 1,655
Provision for income taxes, amount $ 16,526 $ 30,582 $ 29,963
Income tax expense at the federal statutory rate, rate 21.00% 21.00% 21.00%
State income tax expense, net of federal benefit, rate 5.00% 5.30% 3.90%
Windfall tax benefits, net related to stock-based compensation, rate 0.40% (0.20%) (1.30%)
Change in valuation allowance, rate 0.80% 1.30% 0.60%
Permanent and other items, rate 0.60% 1.00% 1.40%
Provision for income taxes, rate 27.80% 28.40% 25.60%