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Supplemental Oil and Gas Disclosures - Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Proved oil and gas properties	$ 37,048us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	$ 752,454us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	$ 3,159us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproved oil and gas properties	30,891us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	837,419us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	34,098us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration costs	3,064us-gaap_CostsIncurredExplorationCosts	2,260us-gaap_CostsIncurredExplorationCosts	3,250us-gaap_CostsIncurredExplorationCosts
Development costs	1,437,923us-gaap_CostsIncurredDevelopmentCosts	890,267us-gaap_CostsIncurredDevelopmentCosts	1,074,441us-gaap_CostsIncurredDevelopmentCosts
Asset retirement costs	6,278us-gaap_CostsIncurredAssetRetirementObligationIncurred	11,856us-gaap_CostsIncurredAssetRetirementObligationIncurred	9,359us-gaap_CostsIncurredAssetRetirementObligationIncurred
Total costs incurred	$ 1,515,204us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties	$ 2,494,256us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties	$ 1,124,307us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties

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- Definition

Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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