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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