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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) | Jun. 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 | 865,000 | [1]
Weighted Average Hedge Price | $ / MMBTU | 3.21 | [1]
2017 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | 8,761 | [1]
Weighted Average Hedge Price | $ / bbl | 56.38 | [1]
2017 Commodity Contract | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Volume Hedged | 3,000 |
Weighted Average Hedge Price | $ / gal | 0.27 |
2017 Commodity Contract | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | 13,826 |
Weighted Average Hedge Price | $ / gal | 0.57 |
2017 Commodity Contract | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Volume Hedged | 7,875 |
Weighted Average Hedge Price | $ / gal | 0.75 |
2017 Commodity Contract | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Volume Hedged | 5,500 |
Weighted Average Hedge Price | $ / gal | 1.07 |
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 | 23,370 |
Weighted Average Hedge Price | $ / MMBTU | 3.70 | [3]
2018 Commodity Contract | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 417,260 |
Weighted Average Hedge Price | $ / MMBTU | 3.25 |
2018 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | 5,250 |
Weighted Average Hedge Price | $ / bbl | 53.20 |
2018 Commodity Contract | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Volume Hedged | 250 |
Weighted Average Hedge Price | $ / gal | 0.29 |
2018 Commodity Contract | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Volume Hedged | 7,199 |
Weighted Average Hedge Price | $ / gal | 0.65 |
2018 Commodity Contract | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Volume Hedged | 4,250 |
Weighted Average Hedge Price | $ / gal | 0.81 |
2018 Commodity Contract | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Volume Hedged | 1,500 |
Weighted Average Hedge Price | $ / gal | 1.19 |
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 |
2019 Commodity Contract | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Volume Hedged | 500 |
Weighted Average Hedge Price | $ / bbl | 51.75 |
[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 $0.27.

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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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