XML 71 R60.htm IDEA: XBRL DOCUMENT v3.20.2
Derivative Activities - Additional Information (Detail)
1 Months Ended 9 Months Ended
Aug. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
MMBTU
bbl
North Louisiana | Maximum | Contingent Consideration    
Derivative [Line Items]    
Potential contractual payout of contingent consideration $ 90,000,000.0 $ 90,000,000.0
Derivatives Excluding Basis Swaps and Freight Swaps    
Derivative [Line Items]    
Derivative assets liabilities at fair value net   (83,500,000)
Commodity | Natural Gas Basis Swaps    
Derivative [Line Items]    
Derivative assets liabilities at fair value net   $ 5,400,000
Volume Hedged | MMBTU   81,745,000
Commodity | Propane Spread Swaps    
Derivative [Line Items]    
Derivative assets liabilities at fair value net   $ (529,000)
Volume Hedged | bbl   312,500
Freight | Swaps | Level 2    
Derivative [Line Items]    
Derivative assets liabilities at fair value net   $ (1,400,000)