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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) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |
Acquisition Costs, Period Cost | [1],[2] | $ 0 | $ 404,252 | $ 0
Asset retirement obligations | [1] | $ 22,184 | 56,822 | $ 76,373
Conger Exchange Transaction |  |  |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |
Asset retirement obligations |  |  | 11,900 |
Gas Gathering Assets |  |  |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |
Acquisition Costs, Period Cost |  |  | $ 134,800 |
[1] | Includes cost incurred whether capitalized or expensed.
[2] | See also Note 3 for additional information related to the 2014 Conger Exchange which includes $134.8 million of gas gathering assets received in the exchange and $11.9 million of asset retirement obligations added in the exchange.

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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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- Definition Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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