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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets |  |
Derivative assets |  | $ 16,927
Liabilities |  |
Derivative liabilities | $ (7) | (170)
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 16,927
Liabilities |  |
Derivative liabilities | (7) | (170)
Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 16,901
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 26
Liabilities |  |
Derivative liabilities | (7) | (170)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 16,927
Liabilities |  |
Derivative liabilities | (7) | (170)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 16,901
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  | 26
Liabilities |  |
Derivative liabilities | $ (7) | $ (170)

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