Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Additional Information (Detail)

v3.20.4
Derivative Instruments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Customer
Entity
Dec. 31, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative Asset $ 104,242 $ 6,881
Commodity contracts    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative Asset $ 4,300  
Number Of Derivative Counterparty | Entity 8  
Commodity contracts | Crude Oil    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Underlying Basis WTI  
Commodity contracts | MEH [Member]    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Underlying Basis MEH  
Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Number Of Derivative Counterparty | Customer 4  
Derivative, Notional Amount $ 300,000  
Derivative, Average Fixed Interest Rate 136.00%