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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) bbl / d Mcf / d | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rent expense under operating leases | $ | $ 19.1 | $ 14.0 | $ 15.9
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 20 years |  |
Minimum remaining terms of leases on undeveloped acreage, in years | 3 years |  |
Maximum remaining terms of leases on undeveloped acreage, in years | 5 years |  |
2018 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | bbl / d | 13,000 |  |
Natural Gas | 2038 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 400,000 |  |
Natural Gas | Late 2018 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 15,000 |  |
Natural Gas | Early 2019 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 65,000 |  |
Natural Gas | Late 2019 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 180,000 |  |
North Louisiana |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Remaining liability for expected volume deficiency payments | $ | $ 25.1 |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Period remaining on leases or concessions that will expire on undeveloped acreage, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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