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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) bbl / d Mcf / d | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rent expense under operating leases | $ | $ 14.0 | $ 15.9 | $ 13.3
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 | 10,000 |  |
Minimum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 15 years |  |
Maximum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 20 years |  |
Natural Gas | 2032 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 1,300,000 |  |
Natural Gas | 2037 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 400,000 |  |
Natural Gas | 2017 through 2032 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Gathering commitments contingent upon pipeline construction or modification | 400,000 |  |
Natural Gas | 2018 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 65,000 |  |
Natural Gas | 2017 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 50,000 |  |
Natural Gas | 2019 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 215,000 |  |
North Louisiana |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Liability for expected volume deficiency payments | $ | $ 59.2 |  |

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