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
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Income tax expense at the federal statutory rate, amount $ 4,472 $ 5,106
State income tax expense, net of federal benefit, amount 894 1,097
Windfall tax benefits, net related to stock-based compensation, amount (265) (217)
Change in valuation allowance, amount 259 40
Permanent and other items, amount 297 276
Provision for income taxes, amount $ 5,657 $ 6,302
Income tax expense at the federal statutory rate, rate 21.00% 21.00%
State income tax expense, net of federal benefit, rate 4.20% 4.50%
Windfall tax benefits, net related to stock-based compensation, rate (1.20%) (0.90%)
Change in valuation allowance, rate 1.20% 0.20%
Permanent and other items, rate 1.40% 1.10%
Provision for income taxes, rate 26.60% 25.90%