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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2015 USD ($) MMBTU / d
Commitments And Contingencies Disclosure [Line Items] |
Transportation commitments future minimum transportation fees due three months change | $ | $ 476.3
Period of transportation commitments future minimum transportation fees due three months change | 14 years
Natural Gas | Minimum |
Commitments And Contingencies Disclosure [Line Items] |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 2 years
Oil and Gas Delivery Commitments and Contracts, Daily Production | 1,000
Natural Gas | Maximum |
Commitments And Contingencies Disclosure [Line Items] |
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract | 5 years
Oil and Gas Delivery Commitments and Contracts, Daily Production | 40,000

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