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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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