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Discontinued Operations - Summary Of Financial Information For Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Revenues		$ 493,233us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Income (loss) from discontinued operations before taxes	(1,014)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	46,576us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
Gain on disposal of discontinued operations before taxes		17,962us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
(Provision) benefit for income taxes	387us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	(47,603)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income (loss) from discontinued operations, net of taxes	$ (627)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ 16,935us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

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- Definition

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

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Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: 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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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 before extraordinary items 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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