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Sale of Piceance and Arkoma Properties - Discontinued Operations (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Discontinued Operations:
Gain on sale of discontinued operations	$ (3,564)

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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