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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Derivative assets | $ 57 |
Liabilities |  |
Derivative liabilities | 3,639 | $ 7
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 57 |
Liabilities |  |
Derivative liabilities | (3,639) | (7)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 57 |
Liabilities |  |
Derivative liabilities | (3,639) |
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Derivative liabilities |  | (7)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 57 |
Liabilities |  |
Derivative liabilities | (3,639) | (7)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 57 |
Liabilities |  |
Derivative liabilities | $ (3,639) |
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Derivative liabilities |  | $ (7)

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