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Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ 15,782us-gaap_CurrentFederalTaxExpenseBenefit	$ 4,140us-gaap_CurrentFederalTaxExpenseBenefit	$ (4,371)us-gaap_CurrentFederalTaxExpenseBenefit
State	2,527	449	(1,716)
Deferred	250us-gaap_DeferredIncomeTaxExpenseBenefit	1,046us-gaap_DeferredIncomeTaxExpenseBenefit	(18,140)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit), continuing operations	$ 18,559us-gaap_IncomeTaxExpenseBenefit	$ 5,635us-gaap_IncomeTaxExpenseBenefit	$ (24,227)us-gaap_IncomeTaxExpenseBenefit

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

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

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