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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Derivative assets	$ 68	$ 388
Liabilities
Derivative liabilities	(11,254)	(3,422)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	68	388
Liabilities
Derivative liabilities	(11,254)	(3,422)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	68	388
Liabilities
Derivative liabilities	(11,254)	(3,422)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	68	388
Liabilities
Derivative liabilities	(11,254)	(3,422)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	68	388
Liabilities
Derivative liabilities	$ (11,254)	$ (3,422)

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