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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |  |  |
Proved oil and gas properties | $ 37,048 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves | $ 752,454 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves | $ 3,159 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproved oil and gas properties | 30,891 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties | 837,419 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties | 34,098 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration costs | 3,064 us-gaap_CostsIncurredExplorationCosts | 2,260 us-gaap_CostsIncurredExplorationCosts | 3,250 us-gaap_CostsIncurredExplorationCosts
Development costs | 1,437,923 us-gaap_CostsIncurredDevelopmentCosts | 890,267 us-gaap_CostsIncurredDevelopmentCosts | 1,074,441 us-gaap_CostsIncurredDevelopmentCosts
Asset retirement costs | 6,278 us-gaap_CostsIncurredAssetRetirementObligationIncurred | 11,856 us-gaap_CostsIncurredAssetRetirementObligationIncurred | 9,359 us-gaap_CostsIncurredAssetRetirementObligationIncurred
Total costs incurred | $ 1,515,204 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties | $ 2,494,256 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties | $ 1,124,307 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties

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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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