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Income Taxes - Components of Current and Deferred Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State and local	94us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	0us-gaap_CurrentForeignTaxExpenseBenefit	0us-gaap_CurrentForeignTaxExpenseBenefit	0us-gaap_CurrentForeignTaxExpenseBenefit
Total current	94us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	10,739us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local	1,664us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit	0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred	12,403us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense from operations	$ 12,497us-gaap_IncomeTaxExpenseBenefit

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