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Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ 12,661us-gaap_CurrentFederalTaxExpenseBenefit	$ 2,509us-gaap_CurrentFederalTaxExpenseBenefit	$ 12,035us-gaap_CurrentFederalTaxExpenseBenefit
State	157	68	72
Total current tax provision	12,818us-gaap_CurrentIncomeTaxExpenseBenefit	2,577us-gaap_CurrentIncomeTaxExpenseBenefit	12,107us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax provision (benefit)	4,862us-gaap_DeferredIncomeTaxExpenseBenefit	12,704us-gaap_DeferredIncomeTaxExpenseBenefit	2,551us-gaap_DeferredIncomeTaxExpenseBenefit
Total tax provision (benefit), Amount	$ 17,680us-gaap_IncomeTaxExpenseBenefit	$ 15,281us-gaap_IncomeTaxExpenseBenefit	$ 14,658us-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 income tax expense (benefit) pertaining to income (loss) from continuing operations.