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, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax expense at the federal statutory rate, amount $ 22,578 $ 24,616 $ 34,729
State income tax expense, net of federal benefit, amount 5,698 4,550 3,577
Windfall tax benefits, net related to stock-based compensation, amount (196) (1,535) (2,568)
Change in valuation allowance, amount 1,351 677 170
Effect of rate and other changes on federal deferred taxes, net due to enactment of Tax Cuts and Jobs Act ("the Act"), amount 0 0 11,644
Permanent and other items, amount 1,151 1,655 150
Provision for income taxes, amount $ 30,582 $ 29,963 $ 47,702
Income tax expense at the federal statutory rate, rate 21.00% 21.00% 35.00%
State income tax expense, net of federal benefit, rate 5.30% 3.90% 3.60%
Windfall tax benefits, net related to stock-based compensation, rate (0.20%) (1.30%) (2.60%)
Change in valuation allowance, rate 1.30% 0.60% 0.20%
Effect of rate and other changes on federal deferred taxes, net due to enactment of Tax Cuts and Jobs Act ("the Act"), rate 0.00% 0.00% 11.70%
Permanent and other items, rate 1.00% 1.40% 0.20%
Provision for income taxes, rate 28.40% 25.60% 48.10%