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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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