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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Commitments And Contingencies Disclosure [Line Items] |
Transportation commitments future minimum transportation fees due three months change | $ 628.4
Period of transportation commitments future minimum transportation fees due three months change | 25 years
Minimum |
Commitments And Contingencies Disclosure [Line Items] |
Terms of Contingent Transportation and Gathering Contracts | 5 years
Transportation and gathering commitments contingent upon construction and modification | 25,000
Maximum |
Commitments And Contingencies Disclosure [Line Items] |
Terms of Contingent Transportation and Gathering Contracts | 15 years
Transportation and gathering commitments contingent upon construction and modification | 300,000

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