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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax at statutory rate (35%)									$ 20,241	$ 17,699	$ 14,684
State taxes (net of federal benefit)									2,899	3,361	2,020
Business meals and entertainment - non-deductible									779	667	624
Reserves for uncertain tax positions									(324)	(1,724)	(531)
Net change in tax rate									(1,046)	(214)	(414)
Other, net									280	365	194
Provision for income taxes from continuing operations	$ (2,226)	$ 6,787	$ 4,696	$ 13,572	$ (2,137)	$ 4,353	$ 4,824	$ 13,114	$ 22,829	$ 20,154	$ 16,577
Effective income tax rate									39.50%	39.90%	39.50%

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Income tax reconciliation reserves for uncertain tax positions.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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 increase (decrease) in the income tax rates.

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