Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Commodity derivative assets – current $ 4,131 $ 34,932
Derivative assets 2,750 10,100
Liabilities:    
Derivative liabilities, current 23,450 991
Derivative liabilities, noncurrent (3,385) 0
Fair Value, Measurements, Recurring | Commodity contracts    
Assets:    
Commodity derivative assets – current 4,131 34,932
Derivative assets 2,750 10,100
Liabilities:    
Derivative liabilities, current (23,450) (991)
Derivative liabilities, noncurrent (3,385) 0
Fair Value, Measurements, Recurring | Commodity contracts | Level 1    
Assets:    
Commodity derivative assets – current 0 0
Derivative assets 0 0
Liabilities:    
Derivative liabilities, current 0 0
Derivative liabilities, noncurrent 0 0
Fair Value, Measurements, Recurring | Commodity contracts | Level 2    
Assets:    
Commodity derivative assets – current 4,131 34,932
Derivative assets 2,750 10,100
Liabilities:    
Derivative liabilities, current (23,450) (991)
Derivative liabilities, noncurrent (3,385) 0
Fair Value, Measurements, Recurring | Commodity contracts | Level 3    
Assets:    
Commodity derivative assets – current 0 0
Derivative assets 0 0
Liabilities:    
Derivative liabilities, current 0 0
Derivative liabilities, noncurrent $ 0 $ 0
Crude Oil | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Underlying Basis WTI  
Louisiana Light Sweet [Member] | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Underlying Basis LLS  
MEH [Domain] | Commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Underlying Basis MEH