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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) | Sep. 30, 2017 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
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2017 Commodity Contract | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 878,370 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.21 | [1]
2017 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 9,511 | [1]
Weighted Average Hedge Price | $ / bbl | 56.03 | [1]
2017 Commodity Contract | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 3,000 |
Weighted Average Hedge Price | $ / gal | 0.27 |
2017 Commodity Contract | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 17,576 |
Weighted Average Hedge Price | $ / gal | 0.61 |
2017 Commodity Contract | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 9,000 |
Weighted Average Hedge Price | $ / gal | 0.76 |
2017 Commodity Contract | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 6,416 |
Weighted Average Hedge Price | $ / gal | 1.08 |
2017 Commodity Contract | Collars | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 122,609 | [1]
Weighted Average Floor Price | $ / MMBTU | 3.45 | [1]
Weighted Average Cap Price | $ / MMBTU | 4.11 | [1]
2017 Commodity Contract | Puts | Purchased | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 185,870 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.50 | [1],[2]
2017 Commodity Contract | Calls | Sold | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 17,935 |
Weighted Average Hedge Price | $ / MMBTU | 3.75 | [3]
2018 Commodity Contract | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 477,534 |
Weighted Average Hedge Price | $ / MMBTU | 3.22 |
2018 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 6,000 |
Weighted Average Hedge Price | $ / bbl | 52.96 |
2018 Commodity Contract | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 250 |
Weighted Average Hedge Price | $ / gal | 0.29 |
2018 Commodity Contract | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 8,935 |
Weighted Average Hedge Price | $ / gal | 0.66 |
2018 Commodity Contract | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 4,558 |
Weighted Average Hedge Price | $ / gal | 0.81 |
2018 Commodity Contract | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 4,027 |
Weighted Average Hedge Price | $ / gal | 1.17 |
2018 Commodity Contract | Collars | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 60,000 |
Weighted Average Floor Price | $ / MMBTU | 3.40 |
Weighted Average Cap Price | $ / MMBTU | 3.76 |
January-March 2019 Commodity Contract | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 50,000 |
Weighted Average Hedge Price | $ / MMBTU | 3.01 |
April-December 2018 Commodity Contract | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 320,000 | [4]
Weighted Average Hedge Price | $ / MMBTU | 3.04 | [4]
2019 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | bbl / d | 1,000 |
Weighted Average Hedge Price | $ / bbl | 51.50 |
2019 Commodity Contract | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 60,000 | [4]
Weighted Average Hedge Price | $ / MMBTU | 3.00 | [4]
[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.
[4] | Contains a combined derivative instrument consisting of a fixed price swap and a sold option to extend or double the volume. For April through December of 2018, we have swaps in place for 160,000 Mmbtu per day on which the counterparty can elect to double the volume at a weighted average price of $3.02. We also have swaps in place for 160,000 Mmbtu per day on which the counterparty can elect to extend the contract through December 2019 at a weighted average price of $3.07. In 2019, if the counterparty elects to double the volume, we would have additional swaps covering 60,000 Mmbtu per day at a weighted average price of $3.00.

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