XML 43 R32.htm IDEA: XBRL DOCUMENT v3.21.1
Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets $ 94 $ 97
Derivative liabilities (1,676) (768)
Total derivative instruments (1,582) (671)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative asset short-term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 17 0
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative liability short-term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (346) (296)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative liability Long Term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (7) (44)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative liability short-term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (938) (428)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative liability Long Term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (385)  
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Derivative asset short-term [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets $ 77 $ 97