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Costs Incurred for Property Acquisition, Exploration and Development - Costs Incurred for Property Acquisition, Exploration and Development (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Costs incurred to acquire gas gathering assets | $ 409,331 | [1],[2]
Gas Gathering Assets |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Costs incurred to acquire gas gathering assets | $ 134,800 |
[1] | Includes costs incurred whether capitalized or expensed.
[2] | See also Note 4 for additional information related to the Conger Exchange. Includes $134.8 million of gas gathering assets.

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