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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Impairment of natural gas properties	$ 39,670	$ 39,670
Balance in excess of FDIC-insured limits		14,800
Chemical [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of natural gas properties	39,700
Fair value of natural gas properties	$ 22,500	$ 22,500
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest in equity method investment	20.00%	20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest in equity method investment	50.00%	50.00%
Noncurrent Restricted Investments [Member] | CD [Member]
Summary Of Significant Accounting Policies [Line Items]
Original maturity period		No longer than approximately 26 weeks
Short-Term Investments [Member]
Summary Of Significant Accounting Policies [Line Items]
Original maturity period		No more than 26 weeks

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The balance of an asset deposited or invested that are in excess of the FDIC-insured limit.

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

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Summary Of Significant Accounting Policies [Line Items]

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



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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



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-Name Accounting Standards Codification



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-Section 45



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