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Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal		$ (690)us-gaap_CurrentFederalTaxExpenseBenefit	$ (1,848)us-gaap_CurrentFederalTaxExpenseBenefit	$ 920us-gaap_CurrentFederalTaxExpenseBenefit
State		147	284	425
Foreign		124us-gaap_CurrentForeignTaxExpenseBenefit	112us-gaap_CurrentForeignTaxExpenseBenefit	231us-gaap_CurrentForeignTaxExpenseBenefit
Current, Total		(419)us-gaap_CurrentIncomeTaxExpenseBenefit	(1,452)us-gaap_CurrentIncomeTaxExpenseBenefit	1,576us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal		(6)	4,491	(369)
Provision (benefit) for income taxes	$ 552us-gaap_IncomeTaxExpenseBenefit	$ (425)us-gaap_IncomeTaxExpenseBenefit	$ 3,039us-gaap_IncomeTaxExpenseBenefit	$ 1,207us-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.