Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current $ 50,414 $ 4,131
Derivative liabilities 22,861 23,450
Derivative Asset, Noncurrent 2,619 2,750
Derivative Liability, Noncurrent 5,542 3,385
Derivative Liability 28,403 26,835
Derivative Asset 53,033 6,881
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset 30,900  
Commodity contracts | Current Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current 50,414 4,131
Derivative liabilities 19,260 23,450
Commodity contracts | Noncurrent Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Noncurrent 2,619 2,750
Derivative Liability, Noncurrent 2,903 3,385
Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative Liability 6,200  
Interest Rate Swap | Current Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current 0 0
Derivative liabilities 3,601 0
Interest Rate Swap | Noncurrent Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Noncurrent 0 0
Derivative Liability, Noncurrent 2,639 0
Fair Value, Measurements, Recurring | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current 50,414 4,131
Derivative liabilities 19,260 (23,450)
Derivative Asset, Noncurrent 2,619 2,750
Derivative Liability, Noncurrent 2,903 $ 3,385
Fair Value, Measurements, Recurring | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current 0  
Derivative liabilities 3,601  
Derivative Asset, Noncurrent 0  
Derivative Liability, Noncurrent $ 2,639