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Income Taxes - Consolidated Provisions for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Federal
Current									$ 4us-gaap_CurrentFederalTaxExpenseBenefit	$ 971us-gaap_CurrentFederalTaxExpenseBenefit
Deferred									1,213	245
Total									1,217	1,216
State
Current									13	230
Deferred									599	63
Total									612	293
Total	$ 532us-gaap_IncomeTaxExpenseBenefit	$ 413us-gaap_IncomeTaxExpenseBenefit	$ 608us-gaap_IncomeTaxExpenseBenefit	$ 276us-gaap_IncomeTaxExpenseBenefit	$ 303us-gaap_IncomeTaxExpenseBenefit	$ 350us-gaap_IncomeTaxExpenseBenefit	$ 512us-gaap_IncomeTaxExpenseBenefit	$ 344us-gaap_IncomeTaxExpenseBenefit	$ 1,829us-gaap_IncomeTaxExpenseBenefit	$ 1,509us-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 federal 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.