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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Derivative assets		$ 97
Liabilities
Derivative liabilities	$ (7,834)	(768)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		97
Liabilities
Derivative liabilities	(7,834)	(768)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		97
Liabilities
Derivative liabilities	(7,834)	(768)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		97
Liabilities
Derivative liabilities	(7,834)	(768)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		97
Liabilities
Derivative liabilities	$ (7,834)	$ (768)

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