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Supplemental Natural Gas Disclosures - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Well Location $ / Mcf MMcf
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Exploratory wells or related costs |  | $ 0
Revisions of previous estimates for proved undeveloped reserves | MMcf |  | 25,812
Transfer of proved undeveloped reserves to proved developed | MMcf |  | 0
Proved undeveloped reserves development period |  | 5 years
Number of locations remain in PUD category | Location |  | 4
Average sales price of gas produced | $ / Mcf |  | 1.01
Average production costs | $ / Mcf |  | 0.23
Productive gas wells, Gross | Well |  | 34
Productive gas wells, Net | Well |  | 4.08
Wells in process of drilling | Well |  | 0
Chemical [Member] |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Impairment charge |  | $ 43,200,000
Fair value of natural gas properties |  | 22,500,000
Chemical [Member] | Marcellus Shale Region [Member] |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Impairment charge | $ 39,700,000 | $ 39,700,000
Fair value of natural gas properties | $ 22,500,000 |

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- Definition Production costs incurred in lifting the oil and gas to the surface during the reporting period divided by the number of barrels of oil equivalents (BOE) produced. Production (or lifting costs) are costs incurred in lifting the oil and gas to the surface and generally include gathering, treating, primary processing, field storage, property taxes and insurance on proved properties, but do not include depreciation, depletion, accretion, amortization, royalties, income taxes, interest, general and administrative and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (2) + Details
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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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