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Derivative Activities - Additional Information (Detail) | Sep. 30, 2018 USD ($) t_per_M MMBTU bbl
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Derivatives Excluding Basis Swaps and Freight Swaps |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (104,800,000)
Commodity | Basis Swaps | Natural Gas |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (1,300,000)
Volume Hedged | MMBTU | 73,660,000
Commodity | Basis Swaps | Propane |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (2,000,000)
Commodity | Swaps | Freight | Level 2 |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ 301,000
Volume Hedged | t_per_M | 5,000
2019 Commodity Contract | Basis Swaps | Propane |
Derivative [Line Items] |
Volume Hedged | bbl | 1,943,000

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