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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal tax expense at statutory rate									$ 13,632	$ 13,349	$ 8,379
Increase (reduction) in income taxes resulting from:
State tax, net of federal benefit									1,275	1,098	603
Non-deductible compensation										378
Other									10	(51)	155
Total	$ 4,014	$ 4,020	$ 3,668	$ 3,215	$ 4,969	$ 3,987	$ 3,316	$ 2,502	$ 14,917	$ 14,774	$ 9,137

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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