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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

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