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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ 1,235 | $ 392
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized gain (loss) on derivative instruments, net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (394) | 2,267
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized (Loss) Gain on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (278) | (9)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized gain (loss) on derivative instruments, net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | 5,600 | (1,720)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized (Loss) Gain on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (3,642) | $ (146)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Realized (Loss) Gain on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (175) |
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Unrealized Gain on Derivative Instruments, Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ 124 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition 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. + References No definition available. + Details
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