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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Costs Incurred for Property Acquisition, Exploration and Development (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($)
Gas Gathering Assets |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |
Acquisition Costs, Period Cost | $ 134.8

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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties associated with business combination. + References No definition available. + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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