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v3.20.4

Derivative Activities - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) MMBTU | Dec. 31, 2021 t_per_M | Jun. 30, 2021 t_per_M
Contingent Consideration |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets liabilities at fair value net |  |  | $ 16,000,000.0 |  |
North Louisiana | Maximum | Contingent Consideration |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Potential Contractual Payout Of Contingent Consideration | $ 90,000,000 | $ 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 |  |  | 18,000,000.0 |  |
Commodity | Natural Gas Basis Swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets liabilities at fair value net |  |  | $ 3,700,000 |  |
Volume Hedged | MMBTU |  |  | 180,510,000 |  |
Commodity | Propane Spread Swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets liabilities at fair value net |  |  | $ 794,000,000 |  |
Freight | Swap | Fair Value, Inputs, Level 2 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets liabilities at fair value net |  |  | $ 1,100,000 |  |
Freight | Swap | Contracts Settle in 2021 | Fair Value, Inputs, Level 2 | Forecast |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume Hedged | t_per_M |  |  |  | 10,000 | 5,000

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