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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Net operating loss carryforward $ 35,650us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 17,215us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Bonus and stock-based compensation 11,025us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 8,060us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Derivative instruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments 1,664us-gaap_DeferredTaxAssetsDerivativeInstruments
Other tax attribute carryovers 1,349us-gaap_DeferredTaxAssetsOtherTaxCarryforwards 0us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
Total deferred tax assets 48,024us-gaap_DeferredTaxAssetsGross 26,939us-gaap_DeferredTaxAssetsGross
Oil and natural gas properties 566,382us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 343,751us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Derivative instruments 105,911us-gaap_DeferredTaxLiabilitiesDerivatives 0us-gaap_DeferredTaxLiabilitiesDerivatives
Total deferred tax liabilities 672,293us-gaap_DeferredTaxLiabilities 343,751us-gaap_DeferredTaxLiabilities
Total net deferred tax liability $ 624,269us-gaap_DeferredTaxAssetsLiabilitiesNet $ 316,812us-gaap_DeferredTaxAssetsLiabilitiesNet