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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$ 5,983	$ (4,148)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized gain on derivative instruments, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	(351)	123
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	476	90
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized gain (loss) on derivative instruments, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	161	(2,776)
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	$ 5,697	(1,814)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Unrealized gain (loss) on derivative instruments, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income		$ (124)

X

- 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

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