Provisions (Benefits) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ (2)us-gaap_CurrentFederalTaxExpenseBenefit	$ 32us-gaap_CurrentFederalTaxExpenseBenefit	$ (82)us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	154us-gaap_CurrentForeignTaxExpenseBenefit	300us-gaap_CurrentForeignTaxExpenseBenefit
State	51	228	47
Total current	203us-gaap_CurrentIncomeTaxExpenseBenefit	560us-gaap_CurrentIncomeTaxExpenseBenefit	(35)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	4,043	12,953	(14,107)
Foreign		(87)
State	(717)	3,165	(1,349)
Total deferred	3,326	16,031	(15,456)
Total provision (benefit) for income taxes	$ 3,529us-gaap_IncomeTaxExpenseBenefit	$ 16,591us-gaap_IncomeTaxExpenseBenefit	$ (15,491)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred income tax expense (benefit) and income tax credits.

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