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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Derivative assets | $ 388 | $ 57
Liabilities |  |
Derivative liabilities | (3,422) | (3,639)
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 388 | 57
Liabilities |  |
Derivative liabilities | (3,422) | (3,639)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 388 | 57
Liabilities |  |
Derivative liabilities | (3,422) | (3,639)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 388 | 57
Liabilities |  |
Derivative liabilities | (3,422) | (3,639)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 388 | 57
Liabilities |  |
Derivative liabilities | $ (3,422) | $ (3,639)

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