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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) MMcf / d MBbls / d | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rent expense under operating leases | $ | $ 15.9 | $ 13.3 | $ 13.1
Minimum remaining terms of leases on undeveloped acreage, in years | 3 years |  |
Maximum remaining terms of leases on undeveloped acreage, in years | 5 years |  |
2016 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | MBbls / d | 20 |  |
Minimum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 6 years |  |
Maximum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 20 years |  |
Maximum | 2018 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | MBbls / d | 30 |  |
Maximum | 2020 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | MBbls / d | 45 |  |
Natural Gas | 2026 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 2,000 |  |
Natural Gas | 2032 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 1,300 |  |
Natural Gas | 2037 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | 400 |  |
Natural Gas | 2017 through 2032 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Gathering commitments contingent upon pipeline construction or modification | 400 |  |
Natural Gas | 2017 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 50 |  |
Natural Gas | Minimum | 2019 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 200 |  |
Natural Gas | Maximum | 2019 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Delivery commitments contingent upon pipeline construction or modification per day | 300 |  |
Ethane | 2031 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | MBbls / d | 20 |  |
Propane | 2031 |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Transportation commitments contingent upon pipeline construction or modification | MBbls / d | 20 |  |

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