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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Derivative assets   $ 97
Liabilities    
Derivative liabilities $ (6,640) (768)
Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets   97
Liabilities    
Derivative liabilities (6,640) (768)
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets   97
Liabilities    
Derivative liabilities (6,640) (768)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets   97
Liabilities    
Derivative liabilities (6,640) (768)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Derivative assets   97
Liabilities    
Derivative liabilities $ (6,640) $ (768)