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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax expense at the federal statutory rate, amount $ 8,994 $ 31 $ 13,425 $ 4,018
State income tax expense, net of federal benefit, amount 1,999 (69) 3,046 950
(Windfall) shortfall tax benefits, net related to stock-based compensation, amount (52) 90 (79) 73
Change in valuation allowance, amount 17 96 188 460
Permanent and other items, amount 339 (106) 803 458
Provision for income taxes, amount $ 11,297 $ 42 $ 17,383 $ 5,959
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 4.70% (46.80%) 4.80% 5.00%
(Windfall) shortfall tax benefits, net related to stock-based compensation, rate (0.10%) 61.20% (0.10%) 0.40%
Change in valuation allowance, rate 0.00% 65.40% 0.30% 2.40%
Permanent and other items, rate 0.80% (72.40%) 1.20% 2.30%
Provision for income taxes, rate 26.40% 28.40% 27.20% 31.10%