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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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- 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 + Details
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