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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Derivative assets	$ 223	$ 272
Liabilities
Derivative liabilities	(766)	(753)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	223	272
Liabilities
Derivative liabilities	(766)	(753)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	223	272
Liabilities
Derivative liabilities	(766)	(753)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	223	272
Liabilities
Derivative liabilities	(766)	(753)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	223	272
Liabilities
Derivative liabilities	$ (766)	$ (753)

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