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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) | Sep. 30, 2016 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
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Natural Gas | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 901,739 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.32 | [1]
Natural Gas | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 478,192 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.14 | [1]
Natural Gas | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 70,000 |
Weighted Average Hedge Price | $ / MMBTU | 2.92 |
Natural Gas | Collar | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 32,609 | [1]
Weighted Average Floor Price | $ / MMBTU | 4.00 | [1]
Weighted Average Cap Price | $ / MMBTU | 4.71 | [1]
Natural Gas | Collar | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 34,521 | [1]
Weighted Average Floor Price | $ / MMBTU | 4.00 | [1]
Weighted Average Cap Price | $ / MMBTU | 5.06 | [1]
Natural Gas | Purchased Put | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 218,478 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.54 | [1],[2]
Natural Gas | Purchased Put | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 175,890 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.48 | [1],[3]
Crude Oil | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 8,640 | [1]
Weighted Average Hedge Price | $ / bbl | 69.49 | [1]
Crude Oil | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 5,416 | [1]
Weighted Average Hedge Price | $ / bbl | 57.18 | [1]
Crude Oil | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 500 |
Weighted Average Hedge Price | $ / bbl | 54.25 |
Crude Oil | Collar | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 848 | [1]
Weighted Average Floor Price | $ / bbl | 80.00 | [1]
Weighted Average Cap Price | $ / bbl | 99.70 | [1]
Commodity Contract NGLs (C2 - Ethane) | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 5,839 | [1]
Weighted Average Hedge Price | $ / gal | 0.46 | [1]
Commodity Contract NGLs (C2 - Ethane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 3,000 |
Weighted Average Hedge Price | $ / gal | 0.27 |
Commodity Contract NGLs (C3 - Propane) | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 11,142 | [1]
Weighted Average Hedge Price | $ / gal | 0.75 | [1]
Commodity Contract NGLs (C3 - Propane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 6,966 |
Weighted Average Hedge Price | $ / gal | 0.52 |
Commodity Contract NGLs (iC4-isobutane) | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 1,969 | [1]
Weighted Average Hedge Price | $ / gal | 1.21 | [1]
Commodity Contract NGLs (NC4 - Normal Butane) | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 6,071 | [1]
Weighted Average Hedge Price | $ / gal | 0.72 | [1]
Commodity Contract NGLs (NC4 - Normal Butane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 1,500 |
Weighted Average Hedge Price | $ / gal | 0.65 |
Commodity Contract NGLs (C5 - Natural Gasoline) | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | 8,142 | [1]
Weighted Average Hedge Price | $ / gal | 1.36 | [1]
Commodity Contract NGLs (C5 - Natural Gasoline) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 2,000 |
Weighted Average Hedge Price | $ / gal | 0.98 |
[1] | Includes derivative instruments assumed in connection with the Memorial Merger.
[2] | Weighted average deferred premium is ($0.34).
[3] | Weighted average deferred premium is ($0.32).

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