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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Natural Gas | Sep. 30, 2017 MMBTU / d $ / MMBTU
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2017 Commodity Contract | Puts | Purchased |  |
Derivative [Line Items] |  |
Weighted average deferred premium - purchases | (0.32) |
Fixed price swaps | MMBTU / d | 185,870 | [1]
Weighted average price of hedge | 3.50 | [1],[2]
2017 Commodity Contract | Calls | Sold |  |
Derivative [Line Items] |  |
Weighted average deferred premium - sales | 0.31 |
Fixed price swaps | MMBTU / d | 17,935 |
Weighted average price of hedge | 3.75 | [3]
2017 Commodity Contract | Swaps |  |
Derivative [Line Items] |  |
Fixed price swaps | MMBTU / d | 878,370 | [1]
Weighted average price of hedge | 3.21 | [1]
April-December 2018 Commodity Contract | Swaps | Counterparty Can Elect to Double The Volume |  |
Derivative [Line Items] |  |
Fixed price swaps | MMBTU / d | 160,000 |
Weighted average price of hedge | 3.02 |
April-December 2018 Commodity Contract | Swaps | Counterparty Can Elect to Extend Contract |  |
Derivative [Line Items] |  |
Fixed price swaps | MMBTU / d | 160,000 |
Weighted average price of hedge | 3.07 |
2019 Commodity Contract | Swaps | Counterparty Can Elect to Double The Volume |  |
Derivative [Line Items] |  |
Fixed price swaps | MMBTU / d | 60,000 |
Weighted average price of hedge | 3.00 |
[1] | Includes derivative instruments assumed in connection with the MRD Merger.
[2] | Weighted average deferred premium is ($0.32).
[3] | Weighted average deferred premium is $0.31.

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