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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax expense at the federal statutory rate of 35%, amount $ 8,920 $ 8,835 $ 24,713 $ 27,652
State income tax expense, net of federal benefit, amount 993 993 2,734 3,132
Foreign rate differential, amount 16 55 63 162
Windfall tax benefits, net related to stock-based compensation, amount 32 0 (124) 0
Change in valuation allowance, amount 38 138 154 404
Other, amount 11 79 24 174
Provision for income taxes, amount $ 10,010 $ 10,100 $ 27,564 $ 31,524
Income tax expense at the federal statutory rate of 35%, rate 35.00% 35.00% 35.00% 35.00%
State income tax expense, net of federal benefit, rate 3.90% 3.90% 3.90% 4.00%
Foreign rate differential, rate 0.10% 0.20% 0.10% 0.20%
Windfall tax benefits, net related to stock-based compensation, rate 0.10% 0.00% (0.20%) 0.00%
Change in valuation allowance, rate 0.20% 0.50% 0.20% 0.50%
Other, rate 0.00% 0.40% 0.00% 0.20%
Provision for income taxes, rate 39.30% 40.00% 39.00% 39.90%