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 ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax expense at the federal statutory rate of 35%, amount $ 37,485,000 $ 39,679,000 $ 29,044,000
State income tax expense, net of federal benefit, amount 4,346,000 4,569,000 3,622,000
Effect of state tax rate change on deferred taxes, amount (79,000) 1,273,000 0
Permanent differences related to compensation charges, net of federal benefit, amount 39,000 81,000 163,000
Change in valuation allowance, amount 412,000 583,000 442,000
Other, amount 242,000 833,000 181,000
Provision for income taxes $ 42,445,000 $ 47,018,000 $ 33,452,000
Income tax expense at the federal statutory rate of 35%, rate 35.00% 35.00% 35.00%
State income tax expense, net of federal benefit, rate 4.10% 4.00% 4.40%
Effect of state tax rate change on deferred taxes, rate (0.10%) 1.10% 0.00%
Permanent differences related to compensation charges, net of federal benefit, rate 0.00% 0.10% 0.20%
Change in valuation allowance, rate 0.40% 0.50% 0.50%
Other, rate 0.20% 0.80% 0.20%
Provision for income taxes, rate 39.60% 41.50% 40.30%