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Summary of Significant Accounting Policies - Schedule of Gains and Losses from Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (1,638) | $ 5,295 | $ 964 | $ 13,155
Gain (Loss) from Derivative Financial Instruments | Natural Gas Price Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) from derivative financial instruments | $ (1,638) | $ 5,295 | $ 964 | $ 13,155

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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