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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Derivative assets | $ 97 | $ 272
Liabilities |  |
Derivative liabilities | (768) | (753)
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 97 | 272
Liabilities |  |
Derivative liabilities | (768) | (753)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 97 | 272
Liabilities |  |
Derivative liabilities | (768) | (753)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 97 | 272
Liabilities |  |
Derivative liabilities | (768) | (753)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 97 | 272
Liabilities |  |
Derivative liabilities | $ (768) | $ (753)

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