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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax expense at the federal statutory rate, amount $ 24,616 $ 34,729 $ 37,485
State income tax expense, net of federal benefit, amount 4,550 3,577 4,346
Effect of state and foreign rate change on deferred taxes, amount 69 (30) (79)
Windfall tax benefits, net related to stock-based compensation, amount (1,535) (2,568) 0
Change in valuation allowance, amount 677 170 412
Effect of rate and other changes on federal deferred taxes, net due to enactment of the Act, amount 0 11,644 0
Permanent and other items , amount 1,586 180 281
Provision for income taxes $ 29,963 $ 47,702 $ 42,445
Income tax expense at the federal statutory rate, rate 21.00% 35.00% 35.00%
State income tax expense, net of federal benefit rate 3.90% 3.60% 4.10%
Effect of state and foreign rate change on deferred taxes,rate 0.10% 0.00% (0.10%)
Windfall tax benefits, net related to stock-based compensation,rate (1.30%) (2.60%) 0.00%
Change in valuation allowance, rate 0.60% 0.20% 0.40%
Effect of rate and other changes on federal deferred taxes, net due to enactment of the Act,rate 0.00% 11.70% 0.00%
Permanent and other items,rate 1.30% 0.20% 0.20%
Provision for income taxes, rate 25.60% 48.10% 39.60%