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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain/loss recognized in income $ (12,074) $ (10,058)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized (loss) on derivative instruments, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain/loss recognized in income (800) (2,418)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized (loss) on derivative instruments, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain/loss recognized in income (3,603) (1,009)
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 2,718 (4,744)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized (loss) gain on derivative instruments, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain/loss recognized in income $ (10,389) $ (1,887)