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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Derivative assets | $ 272 | $ 2,394
Liabilities |  |
Derivative liabilities | (753) | (98)
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 272 | 2,394
Liabilities |  |
Derivative liabilities | (753) | (98)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 272 | 2,394
Liabilities |  |
Derivative liabilities | (753) | (98)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 272 | 2,394
Liabilities |  |
Derivative liabilities | (753) | (98)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 272 | 2,394
Liabilities |  |
Derivative liabilities | $ (753) | $ (98)

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