Annual report pursuant to Section 13 and 15(d)

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail)

v3.19.3.a.u2
Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Derivatives $ (68,131) $ 37,427 $ (17,819)
Derivative assets, current 4,131 34,932  
Derivative assets, noncurrent 2,750 10,100  
Derivative liabilities, noncurrent 3,385 0  
Derivative Asset 6,881 45,032  
Derivative liabilities, current 23,450 991  
Derivative liabilities 26,835 991  
Commodity contracts      
Derivatives, Fair Value [Line Items]      
Derivative Asset 20,000    
Commodity contracts | Derivative assets/liabilities - current      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 4,131 34,932  
Derivative liabilities, current 23,450 991  
Commodity contracts | Derivative assets/liabilities - noncurrent      
Derivatives, Fair Value [Line Items]      
Derivative assets, noncurrent 2,750 10,100  
Derivative liabilities, noncurrent 3,385 0  
Fair Value, Measurements, Recurring | Commodity contracts      
Derivatives, Fair Value [Line Items]      
Derivative assets, current 4,131 34,932  
Derivative assets, noncurrent 2,750 10,100  
Derivative liabilities, noncurrent 3,385 0  
Derivative liabilities, current $ (23,450) $ (991)