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Income Taxes - Schedule of Components of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 4,336us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,097us-gaap_CurrentFederalTaxExpenseBenefit	$ 8,409us-gaap_CurrentFederalTaxExpenseBenefit
State	334	690	278
Total current tax expense	4,670us-gaap_CurrentIncomeTaxExpenseBenefit	9,787us-gaap_CurrentIncomeTaxExpenseBenefit	8,687us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	305	2,631	(416)
State	(324)	(60)	117
Total deferred tax expense (benefit)	(19)	2,571	(299)
Total	$ 4,651us-gaap_IncomeTaxExpenseBenefit	$ 12,358us-gaap_IncomeTaxExpenseBenefit	$ 8,388us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.