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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, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ (4,148) | $ 1,235
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized gain (loss) on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | 123 | (394)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized gain (loss) on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | 90 | (278)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized (loss) gain on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (2,776) | 5,600
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized (loss) on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (1,814) | (3,642)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Unrealized (loss) gain on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | (124) | 124
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Realized gain (loss) on derivative instruments, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain/loss recognized in income | $ 353 | $ (175)

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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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