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Supplemental Oil and Gas Disclosures - Results of Operations for Oil and Natural Gas Producing 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] |  |  |
Revenues | $ 1,304,004 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | $ 1,084,412 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | $ 670,491 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities
Production costs | 326,381 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 221,095 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 127,146 us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Depreciation, depletion and amortization | 400,118 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | 298,999 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | 202,398 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
Exploration costs | 3,064 us-gaap_ResultsOfOperationsExplorationExpense | 2,260 us-gaap_ResultsOfOperationsExplorationExpense | 3,250 us-gaap_ResultsOfOperationsExplorationExpense
Impairment of oil and gas properties | 47,238 us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties | 1,168 us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties | 3,581 us-gaap_ResultsOfOperationsImpairmentOfOilAndGasProperties
Income tax expense | 197,701 us-gaap_ResultsOfOperationsIncomeTaxExpense | 196,312 us-gaap_ResultsOfOperationsIncomeTaxExpense | 116,941 us-gaap_ResultsOfOperationsIncomeTaxExpense
Results of operations for oil and natural gas producing activities | $ 329,502 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | $ 364,578 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | $ 217,175 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts

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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Exploration costs from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Costs related to the impairment of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(3)(ii)(A)(1)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 + Details
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- Definition Income tax expense for oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62259-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Total revenues from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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