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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Derivative assets	$ 1,838	$ 2,394
Liabilities
Derivative liabilities	(361)	(98)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	1,838	2,394
Liabilities
Derivative liabilities	(361)	(98)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	1,838	2,394
Liabilities
Derivative liabilities	(361)	(98)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	1,838	2,394
Liabilities
Derivative liabilities	(361)	(98)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	1,838	2,394
Liabilities
Derivative liabilities	$ (361)	$ (98)

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