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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Derivative assets	$ 131	$ 57
Liabilities
Derivative liabilities	(621)	(3,639)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	131	57
Liabilities
Derivative liabilities	(621)	(3,639)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	131	57
Liabilities
Derivative liabilities	(621)	(3,639)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	131	57
Liabilities
Derivative liabilities	(621)	(3,639)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	131	57
Liabilities
Derivative liabilities	$ (621)	$ (3,639)

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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