Discontinued Operations - Summary of Activity for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Revenue from discontinued operations	$ 1	$ 3,151	$ 7,895
Operating (loss) income before taxes	(86)	(460)	22
Income tax benefit (expense) from discontinued operations	34	184	(7)
Gain on disposal, before taxes		803	1,168
Income tax expense on disposal		(321)	(358)
(Loss) income from discontinued operations	$ (52)	$ 206	$ 825

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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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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

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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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