Income Taxes - Schedule of (Benefits from) Provision for Income Taxes from 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	$ (10,168)us-gaap_CurrentFederalTaxExpenseBenefit	$ 31,010us-gaap_CurrentFederalTaxExpenseBenefit	$ 18,849us-gaap_CurrentFederalTaxExpenseBenefit
State and local	(346)	677	4,011
Total current (benefit) provision	(10,514)us-gaap_CurrentIncomeTaxExpenseBenefit	31,687us-gaap_CurrentIncomeTaxExpenseBenefit	22,860us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	13,445	1,023	(25,982)
State and local	805	(2,566)	(826)
Total deferred provision (benefit)	14,250us-gaap_DeferredIncomeTaxExpenseBenefit	(1,543)us-gaap_DeferredIncomeTaxExpenseBenefit	(26,808)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for (benefit from) income taxes	$ 3,736us-gaap_IncomeTaxExpenseBenefit	$ 30,144us-gaap_IncomeTaxExpenseBenefit	$ (3,948)us-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 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.