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Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 46,693 | $ 124,647
Gross Amounts Offset in the Balance Sheet | (45,476) | (65,767)
Net Amounts of Assets Presented in the Balance Sheet | 1,217 | 58,880
Gross Amounts of Recognized (Liabilities) | (154,483) | (119,789)
Gross Amounts Offset in the Balance Sheet | 45,476 | 65,767
Net Amounts of (Liabilities) Presented in the Balance Sheet | (109,007) | (54,022)
Commodity | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 6,503 | 87,794
Gross Amounts Offset in the Balance Sheet | (4,745) | (4,106)
Net Amounts of Assets Presented in the Balance Sheet | 1,758 | 83,688
Gross Amounts of Recognized (Liabilities) | (10,030) | (216)
Gross Amounts Offset in the Balance Sheet | 4,745 | 4,106
Net Amounts of (Liabilities) Presented in the Balance Sheet | (5,285) | 3,890
Commodity | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 0 | 2
Gross Amounts Offset in the Balance Sheet | (799) | (7,928)
Net Amounts of Assets Presented in the Balance Sheet | (799) | (7,926)
Gross Amounts of Recognized (Liabilities) | (57,424) | (24,726)
Gross Amounts Offset in the Balance Sheet | 799 | 7,928
Net Amounts of (Liabilities) Presented in the Balance Sheet | (56,625) | (16,798)
Commodity | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 57
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Assets Presented in the Balance Sheet |  | 57
Commodity | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3 | 0
Gross Amounts Offset in the Balance Sheet | (3) | (12,556)
Net Amounts of Assets Presented in the Balance Sheet | 0 | (12,556)
Gross Amounts of Recognized (Liabilities) | (20,363) | (34,325)
Gross Amounts Offset in the Balance Sheet | 3 | 12,556
Net Amounts of (Liabilities) Presented in the Balance Sheet | (20,360) | (21,769)
Commodity | Swaps | Freight |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 301 | 276
Gross Amounts Offset in the Balance Sheet | (301) | (276)
Net Amounts of Assets Presented in the Balance Sheet | 0 | 0
Gross Amounts of Recognized (Liabilities) | 0 | 0
Gross Amounts Offset in the Balance Sheet | 301 | 276
Net Amounts of (Liabilities) Presented in the Balance Sheet | 301 | 276
Commodity | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 0
Gross Amounts Offset in the Balance Sheet |  | (6,051)
Net Amounts of Assets Presented in the Balance Sheet |  | (6,051)
Gross Amounts of Recognized (Liabilities) | (8,223) | (11,188)
Gross Amounts Offset in the Balance Sheet | 0 | 6,051
Net Amounts of (Liabilities) Presented in the Balance Sheet | (8,223) | (5,137)
Commodity | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 0
Gross Amounts Offset in the Balance Sheet |  | (6,727)
Net Amounts of Assets Presented in the Balance Sheet |  | (6,727)
Gross Amounts of Recognized (Liabilities) | (14,937) | (13,488)
Gross Amounts Offset in the Balance Sheet | 0 | 6,727
Net Amounts of (Liabilities) Presented in the Balance Sheet | (14,937) | (6,761)
Commodity | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 12,893 | 18,817
Gross Amounts Offset in the Balance Sheet | (12,700) | (8,103)
Net Amounts of Assets Presented in the Balance Sheet | 193 | 10,714
Gross Amounts of Recognized (Liabilities) | (8,759) | (12,283)
Gross Amounts Offset in the Balance Sheet | 12,700 | 8,103
Net Amounts of (Liabilities) Presented in the Balance Sheet | 3,941 | (4,180)
Commodity | Basis Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,246 | 1,815
Gross Amounts Offset in the Balance Sheet | (1,112) | (6,673)
Net Amounts of Assets Presented in the Balance Sheet | 134 | (4,858)
Gross Amounts of Recognized (Liabilities) | (2,548) | (9,580)
Gross Amounts Offset in the Balance Sheet | 1,112 | 6,673
Net Amounts of (Liabilities) Presented in the Balance Sheet | (1,436) | (2,907)
Commodity | Collars | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 3,039
Gross Amounts Offset in the Balance Sheet |  | (500)
Net Amounts of Assets Presented in the Balance Sheet |  | 2,539
Gross Amounts of Recognized (Liabilities) |  | 0
Gross Amounts Offset in the Balance Sheet |  | 500
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | 500
Commodity | Collars | Crude Oil |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 0 |
Gross Amounts Offset in the Balance Sheet | (69) |
Net Amounts of Assets Presented in the Balance Sheet | (69) |
Gross Amounts of Recognized (Liabilities) | (717) |
Gross Amounts Offset in the Balance Sheet | 69 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (648) |
Commodity | Collars | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 85
Gross Amounts Offset in the Balance Sheet |  | (85)
Net Amounts of Assets Presented in the Balance Sheet |  | 0
Gross Amounts of Recognized (Liabilities) | (3,237) | 0
Gross Amounts Offset in the Balance Sheet | 0 | 85
Net Amounts of (Liabilities) Presented in the Balance Sheet | (3,237) | 85
Commodity | Spread Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 25,747 | 12,762
Gross Amounts Offset in the Balance Sheet | (25,747) | (12,762)
Net Amounts of Assets Presented in the Balance Sheet | 0 | 0
Gross Amounts of Recognized (Liabilities) | (27,741) | (13,983)
Gross Amounts Offset in the Balance Sheet | 25,747 | 12,762
Net Amounts of (Liabilities) Presented in the Balance Sheet | (1,994) | $ (1,221)
Commodity | Calls | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized (Liabilities) | (504) |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ (504) |

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