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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) | Mar. 31, 2017 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
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Natural Gas | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 844,245 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.19 | [1]
Natural Gas | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 417,260 |
Weighted Average Hedge Price | $ / MMBTU | 3.25 |
Natural Gas | Collars | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 123,818 | [1]
Weighted Average Floor Price | $ / MMBTU | 3.46 | [1]
Weighted Average Cap Price | $ / MMBTU | 4.12 | [1]
Natural Gas | Collars | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 7,397 |
Weighted Average Floor Price | $ / MMBTU | 3.40 |
Weighted Average Cap Price | $ / MMBTU | 3.75 |
Natural Gas | Purchased Puts | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 178,909 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.49 | [1],[2]
Natural Gas | Sold Calls | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 9,041 |
Weighted Average Hedge Price | $ / MMBTU | 3.75 | [3]
Crude Oil | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 8,782 | [1]
Weighted Average Hedge Price | $ / bbl | 56.00 | [1]
Crude Oil | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 3,500 |
Weighted Average Hedge Price | $ / bbl | 53.81 |
Crude Oil | Swaps | 2019 |  |
Derivative [Line Items] |  |
Volume Hedged | 250 |
Weighted Average Hedge Price | $ / bbl | 51.00 |
Commodity Contract NGLs (C2 - Ethane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 3,000 |
Weighted Average Hedge Price | $ / gal | 0.27 |
Commodity Contract NGLs (C2 - Ethane) | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 124 |
Weighted Average Hedge Price | $ / gal | 0.29 |
Commodity Contract NGLs (C3 - Propane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 13,895 |
Weighted Average Hedge Price | $ / gal | 0.57 |
Commodity Contract NGLs (C3 - Propane) | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 7,199 |
Weighted Average Hedge Price | $ / gal | 0.65 |
Commodity Contract NGLs (NC4 - Normal Butane) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 7,750 |
Weighted Average Hedge Price | $ / gal | 0.74 |
Commodity Contract NGLs (NC4 - Normal Butane) | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 4,250 |
Weighted Average Hedge Price | $ / gal | 0.81 |
Commodity Contract NGLs (C5 - Natural Gasoline) | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | 5,250 |
Weighted Average Hedge Price | $ / gal | 1.06 |
Commodity Contract NGLs (C5 - Natural Gasoline) | Swaps | 2018 |  |
Derivative [Line Items] |  |
Volume Hedged | 1,500 |
Weighted Average Hedge Price | $ / gal | 1.19 |
[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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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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