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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current $ 50,414 $ 4,131
Derivative Asset, Noncurrent 2,619 2,750
Liabilities:    
Commodity derivative liabilities – current (22,861) (23,450)
Derivative Liability, Noncurrent $ (5,542) (3,385)
Fair Value Measurements
We apply the authoritative accounting provisions included in GAAP for measuring the fair value of both our financial and nonfinancial assets and liabilities. Fair value is an exit price representing the expected amount we would receive upon the sale of an asset or that we would expect to pay to transfer a liability in an orderly transaction with market participants at the measurement date.
Our financial instruments that are subject to fair value disclosure consist of cash and cash equivalents, accounts receivable, accounts payable, derivatives and our Credit Facility and Second Lien Facility borrowings. As of September 30, 2020, the carrying values of all of these financial instruments approximated fair value.
  
Fair Value, Measurements, Recurring | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current $ 50,414 4,131
Derivative Asset, Noncurrent 2,619 2,750
Liabilities:    
Commodity derivative liabilities – current (19,260) 23,450
Derivative Liability, Noncurrent (2,903) (3,385)
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 50,414 4,131
Derivative Asset, Noncurrent 2,619 2,750
Liabilities:    
Commodity derivative liabilities – current (19,260) 23,450
Derivative Liability, Noncurrent (2,903) (3,385)
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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0  
Derivative Asset, Noncurrent 0  
Liabilities:    
Commodity derivative liabilities – current (3,601)  
Derivative Liability, Noncurrent (2,639)  
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0  
Derivative Asset, Noncurrent 0  
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0  
Derivative Asset, Noncurrent 0  
Liabilities:    
Commodity derivative liabilities – current (3,601)  
Derivative Liability, Noncurrent (2,639)  
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0  
Derivative Asset, Noncurrent $ 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 [Domain] | 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