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Provision for (Benefit from) Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision for income taxes
Federal	$ 24us-gaap_CurrentFederalTaxExpenseBenefit	$ 3,490us-gaap_CurrentFederalTaxExpenseBenefit	$ 944us-gaap_CurrentFederalTaxExpenseBenefit
State	17	142	347
Total current provision for income taxes	41us-gaap_CurrentIncomeTaxExpenseBenefit	3,632us-gaap_CurrentIncomeTaxExpenseBenefit	1,291us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision for income taxes
Federal	703	7,316
Total Provision for Income Taxes	$ 744us-gaap_IncomeTaxExpenseBenefit	$ 10,948us-gaap_IncomeTaxExpenseBenefit	$ 1,291us-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.