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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Derivative assets	$ 94	$ 97
Liabilities
Derivative liabilities	(1,676)	(768)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	94	97
Liabilities
Derivative liabilities	(1,676)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	94	97
Liabilities
Derivative liabilities	(1,676)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	94	97
Liabilities
Derivative liabilities	(1,676)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	94	$ 97
Liabilities
Derivative liabilities	$ (1,676)

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