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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Commitments And Contingencies Disclosure [Line Items] |
Transportation commitments future minimum transportation fees due six months change | $ 992.0
Period of transportation commitments future minimum transportation fees due six 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
Delivery of natural gas per day | 50,000
Period for delivery of natural gas | 5 years
Delivery of ethane per day | 5,000
Period of delivery of ethane | 3 years
Maximum |
Commitments And Contingencies Disclosure [Line Items] |
Terms of contingent transportation and gathering contracts | 20 years
Transportation and gathering commitments contingent upon construction and modification | 400,000
Delivery of natural gas per day | 80,000
Period for delivery of natural gas | 10 years
Delivery of ethane per day | 10,000
Period of delivery of ethane | 15 years

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