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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax at statutory rate (35%)									$ 14,499	$ 12,888	$ 10,949
State taxes (net of federal benefit)									2,066	1,176	1,343
Business meals and entertainment - non-deductible									624	674	610
Reserves for uncertain tax positions									(531)	(432)	(844)
Other, net									(220)	(235)	86
Total income tax expense from continuing operations	$ (2,897)	$ 2,663	$ 4,287	$ 12,385	$ (1,715)	$ 1,032	$ 2,267	$ 12,487	$ 16,438	$ 14,071	$ 12,144
Effective income tax rate									39.70%	38.20%	38.80%

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

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