Supplemental Natural Gas Disclosures - Additional Information (Detail)	1 Months Ended	12 Months Ended
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
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	$ 22,500,000

The estimated fair value of natural gas properties as of the balance sheet date.

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- Definition

Number of locations.

+ References

No definition available.

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Number of productive gas wells net.

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- Definition

Proved undeveloped reserves development period.

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No definition available.

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- Definition

Proved undeveloped reserves transferred to proved developed.

+ References

No definition available.

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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)

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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)

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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

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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.

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No definition available.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

The total number of producing gas wells and gas wells capable of production, in which the entity owns an undivided working interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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- Definition

Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447

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- Definition

The number of wells in the process of being drilled in each geographic area as of the date listed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1206
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