Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax expense at the federal statutory rate, amount $ 9,627 $ 1,671 $ 23,052 $ 5,689
State income tax expense, net of federal benefit, amount 2,111 453 5,157 1,403
(Windfall) shortfall tax benefits, net related to stock-based compensation, amount (443) 130 (522) 203
Change in valuation allowance, amount 55 134 243 594
Permanent and other items, amount 571 (472) 1,374 (14)
Provision for income taxes, amount $ 11,921 $ 1,916 $ 29,304 $ 7,875
Income tax expense at the federal statutory rate, rate 21.00% 21.00% 21.00% 21.00%
State income tax expense, net of federal benefit, rate 4.60% 5.70% 4.70% 5.20%
(Windfall) shortfall tax benefits, net related to stock-based compensation, rate (1.00%) 1.60% (0.50%) 0.70%
Change in valuation allowance, rate 0.10% 1.70% 0.20% 2.20%
Permanent and other items, rate 1.30% (5.90%) 1.30% 0.00%
Provision for income taxes, rate 26.00% 24.10% 26.70% 29.10%