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Derivative Activities - Additional Information (Detail)
6 Months Ended
Jun. 30, 2021
USD ($)
MMBTU
Dec. 31, 2021
TPerM
Sep. 30, 2021
TPerM
Contingent Consideration      
Derivative [Line Items]      
Derivative assets liabilities at fair value net $ 21,400,000    
Contingent Consideration | North Louisiana | Maximum      
Derivative [Line Items]      
Potential contractual payout of contingent consideration 75,000,000.0    
Derivatives Excluding Basis Swaps and Freight Swaps      
Derivative [Line Items]      
Derivative assets liabilities at fair value net 287,700,000    
Commodity | Natural Gas Basis Swaps      
Derivative [Line Items]      
Derivative assets liabilities at fair value net $ 25,700,000    
Volume Hedged | MMBTU 229,880,000    
Commodity | Propane Spread Swaps      
Derivative [Line Items]      
Derivative assets liabilities at fair value net $ 376,000    
Freight | Propane Spread Swaps | Contracts Settle in 2021 | Fair Value, Inputs, Level 2      
Derivative [Line Items]      
Derivative assets liabilities at fair value net $ 37,000    
Freight | Swaps | Contracts Settle in 2021 | Fair Value, Inputs, Level 2 | Scenario Forecast      
Derivative [Line Items]      
Volume Hedged | TPerM   12,000 10,000