Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current $ 6,025 $ 75,506
Derivative Asset, Noncurrent 2,693 25,449
Liabilities:    
Commodity derivative liabilities – current (64,346) (85,106)
Derivative Liability, Noncurrent (21,425) (28,434)
Fair Value, Measurements, Recurring | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 6,025 75,506
Derivative Asset, Noncurrent 2,693 25,449
Liabilities:    
Commodity derivative liabilities – current (60,960) 81,451
Derivative Liability, Noncurrent (21,425) (26,789)
Fair Value, Measurements, Recurring | Commodity contracts | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0 0
Derivative Asset, Noncurrent 0 0
Liabilities:    
Commodity derivative liabilities – current 0 0
Derivative Liability, Noncurrent 0 0
Fair Value, Measurements, Recurring | Commodity contracts | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 6,025 75,506
Derivative Asset, Noncurrent 2,693 25,449
Liabilities:    
Commodity derivative liabilities – current (60,960) 81,451
Derivative Liability, Noncurrent (21,425) (26,789)
Fair Value, Measurements, Recurring | Commodity contracts | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0 0
Derivative Asset, Noncurrent 0 0
Liabilities:    
Commodity derivative liabilities – current 0 0
Derivative Liability, Noncurrent 0 0
Fair Value, Measurements, Recurring | Interest Rate Swap    
Liabilities:    
Commodity derivative liabilities – current (3,386)  
Derivative Liability, Noncurrent 0  
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1    
Liabilities:    
Commodity derivative liabilities – current 0 0
Derivative Liability, Noncurrent 0 0
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2    
Liabilities:    
Commodity derivative liabilities – current (3,386) (3,655)
Derivative Liability, Noncurrent 0 (1,645)
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3    
Liabilities:    
Commodity derivative liabilities – current 0 0
Derivative Liability, Noncurrent $ 0 $ 0
Crude Oil | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Third-party quoted forward prices NYMEX WTI  
MEH [Member] | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Third-party quoted forward prices MEH  
Natural Gas [Member] | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Third-party quoted forward prices NYMEX HH  
Natural Gas Liquids | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Third-party quoted forward prices OPIS Mt Belv Ethane