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

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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