Discontinued Operations - Summary of Greenline's Operating Results (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
Oct. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operation Income Loss From Discontinued Operation Disclosures [Abstract]
Revenues		$ 6,137	$ 7,364
Expenses		6,384	10,048
Loss before income taxes and gain on the sale from discontinued operations		(247)	(2,684)
Benefit for income taxes		(58)	(969)
Gain on the sale of discontinued operations, net of tax benefit	7,600	7,642
Income (loss) from discontinued operations		$ 7,453	$ (1,715)

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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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 expenses 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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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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