Summarized Activity in Consolidated Statements of Income for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
Apr. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013
Discontinued Operations And Disposal Groups [Abstract]
Revenue					$ 13,493
Operating loss			68		6,376
Loss before income taxes			68		6,875
Provision for income tax					227
Loss from discontinued operations			68		7,102
Loss (gain) on disposal of discontinued operations	$ (800)	$ 5,600	$ 11	$ 4,800	$ (783)

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

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income 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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After tax 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 operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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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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