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Supplementary Quarterly Financial Data (Unaudited) - Schedule of Supplementary Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Total oil and gas sales	$ 112,616us-gaap_OilAndGasSalesRevenue	$ 144,983us-gaap_OilAndGasSalesRevenue	$ 155,723us-gaap_OilAndGasSalesRevenue	$ 141,909us-gaap_OilAndGasSalesRevenue	$ 105,860us-gaap_OilAndGasSalesRevenue	$ 111,590us-gaap_OilAndGasSalesRevenue	$ 107,820us-gaap_OilAndGasSalesRevenue	$ 95,020us-gaap_OilAndGasSalesRevenue	$ 555,231us-gaap_OilAndGasSalesRevenue	$ 420,290us-gaap_OilAndGasSalesRevenue	$ 384,814us-gaap_OilAndGasSalesRevenue
Operating income (loss)	(80,291)us-gaap_OperatingIncomeLoss	263us-gaap_OperatingIncomeLoss	27,729us-gaap_OperatingIncomeLoss	20,228us-gaap_OperatingIncomeLoss	(24,386)us-gaap_OperatingIncomeLoss	(9,086)us-gaap_OperatingIncomeLoss	(18,004)us-gaap_OperatingIncomeLoss	(20,856)us-gaap_OperatingIncomeLoss	(32,071)us-gaap_OperatingIncomeLoss	(72,332)us-gaap_OperatingIncomeLoss	(144,628)us-gaap_OperatingIncomeLoss
Loss from continuing operations					(36,641)us-gaap_IncomeLossFromContinuingOperations	(24,034)us-gaap_IncomeLossFromContinuingOperations	(21,531)us-gaap_IncomeLossFromContinuingOperations	(24,517)us-gaap_IncomeLossFromContinuingOperations	(57,111)us-gaap_IncomeLossFromContinuingOperations	(106,723)us-gaap_IncomeLossFromContinuingOperations	(103,079)us-gaap_IncomeLossFromContinuingOperations
Income (Loss) from discontinued operations					(857)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax		151,236us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(2,627)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax		147,752us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	3,019us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss)	$ (58,271)us-gaap_NetIncomeLoss	$ (1,903)us-gaap_NetIncomeLoss	$ 1,898us-gaap_NetIncomeLoss	$ 1,165us-gaap_NetIncomeLoss	$ (37,498)us-gaap_NetIncomeLoss	$ (24,034)us-gaap_NetIncomeLoss	$ 129,705us-gaap_NetIncomeLoss	$ (27,144)us-gaap_NetIncomeLoss	$ (57,111)us-gaap_NetIncomeLoss	$ 41,029us-gaap_NetIncomeLoss	$ (100,060)us-gaap_NetIncomeLoss
Basic net income (loss) per share:
Loss from continuing operations, Basic					$ (0.80)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.45)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (1.24)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (loss) from discontinued operations, Basic					$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare		$ 3.13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.06)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare		$ 3.07us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total, Basic	$ (1.26)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ (0.82)us-gaap_EarningsPerShareBasic	$ (0.52)us-gaap_EarningsPerShareBasic	$ 2.68us-gaap_EarningsPerShareBasic	$ (0.58)us-gaap_EarningsPerShareBasic	$ (1.24)us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic	$ (2.16)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share:
Loss from continuing operations, Diluted					$ (0.80)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.45)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (1.24)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (loss) from discontinued operations, Diluted					$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare		$ 3.13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.06)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare		$ 3.07us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total, Diluted	$ (1.26)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (0.82)us-gaap_EarningsPerShareDiluted	$ (0.52)us-gaap_EarningsPerShareDiluted	$ 2.68us-gaap_EarningsPerShareDiluted	$ (0.58)us-gaap_EarningsPerShareDiluted	$ (1.24)us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted	$ (2.16)us-gaap_EarningsPerShareDiluted
Income (loss) per share:
Basic	$ (1.26)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ (0.82)us-gaap_EarningsPerShareBasic	$ (0.52)us-gaap_EarningsPerShareBasic	$ 2.68us-gaap_EarningsPerShareBasic	$ (0.58)us-gaap_EarningsPerShareBasic	$ (1.24)us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic	$ (2.16)us-gaap_EarningsPerShareBasic
Diluted	$ (1.26)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (0.82)us-gaap_EarningsPerShareDiluted	$ (0.52)us-gaap_EarningsPerShareDiluted	$ 2.68us-gaap_EarningsPerShareDiluted	$ (0.58)us-gaap_EarningsPerShareDiluted	$ (1.24)us-gaap_EarningsPerShareDiluted	$ 0.85us-gaap_EarningsPerShareDiluted	$ (2.16)us-gaap_EarningsPerShareDiluted

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