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Summary of Company's Operating Results for Discontinued Operations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 22,509,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 32,832,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 38,135,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Loss before income taxes from discontinued operations	(13,150,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	(4,856,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	(3,898,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Income benefit provision	(5,302,000)us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal	(1,690,000)us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal	(1,332,000)us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal
Loss from discontinued operations, net of tax	$ (7,848,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (3,166,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (2,566,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

X

- Definition

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Tax benefit from provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include a tax on the (gain) for the recognition of a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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