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Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 124,647 | $ 77,079
Gross Amounts Offset in the Balance Sheet | (65,767) | (63,596)
Net Amounts of Assets Presented in the Balance Sheet | 58,880 | 13,483
Gross Amounts of Recognized (Liabilities) | (119,789) | (253,096)
Gross Amounts Offset in the Balance Sheet | 65,767 | 63,596
Net Amounts of (Liabilities) Presented in the Balance Sheet | (54,022) | (189,500)
Commodity | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 87,794 | 13,213
Gross Amounts Offset in the Balance Sheet | (4,106) | (11,425)
Net Amounts of Assets Presented in the Balance Sheet | 83,688 | 1,788
Gross Amounts of Recognized (Liabilities) | (216) | (158,359)
Gross Amounts Offset in the Balance Sheet | 4,106 | 11,425
Net Amounts of (Liabilities) Presented in the Balance Sheet | 3,890 | (146,934)
Commodity | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 2 | 9,356
Gross Amounts Offset in the Balance Sheet | (7,928) | (3,489)
Net Amounts of Assets Presented in the Balance Sheet | (7,926) | 5,867
Gross Amounts of Recognized (Liabilities) | (24,726) | (13,206)
Gross Amounts Offset in the Balance Sheet | 7,928 | 3,489
Net Amounts of (Liabilities) Presented in the Balance Sheet | (16,798) | (9,717)
Commodity | Swaps | NGLs (C2-Ethane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 57 | 53
Gross Amounts Offset in the Balance Sheet | 0 | (53)
Net Amounts of Assets Presented in the Balance Sheet | 57 | 0
Gross Amounts of Recognized (Liabilities) |  | (1,008)
Gross Amounts Offset in the Balance Sheet |  | 53
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | (955)
Commodity | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 0 |
Gross Amounts Offset in the Balance Sheet | (12,556) |
Net Amounts of Assets Presented in the Balance Sheet | (12,556) |
Gross Amounts of Recognized (Liabilities) | (34,325) | (32,437)
Gross Amounts Offset in the Balance Sheet | 12,556 | 0
Net Amounts of (Liabilities) Presented in the Balance Sheet | (21,769) | (32,437)
Commodity | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 0 | 4
Gross Amounts Offset in the Balance Sheet | (6,051) | (4)
Net Amounts of Assets Presented in the Balance Sheet | (6,051) | 0
Gross Amounts of Recognized (Liabilities) | (11,188) | (13,419)
Gross Amounts Offset in the Balance Sheet | 6,051 | 4
Net Amounts of (Liabilities) Presented in the Balance Sheet | (5,137) | (13,415)
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) | (13,488) | (12,176)
Gross Amounts Offset in the Balance Sheet | 6,727 | 0
Net Amounts of (Liabilities) Presented in the Balance Sheet | (6,761) | (12,176)
Commodity | Swaps | Freight |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 276 | 65
Gross Amounts Offset in the Balance Sheet | (276) | (65)
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 | 276 | 65
Net Amounts of (Liabilities) Presented in the Balance Sheet | 276 | 65
Commodity | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 18,817 |
Gross Amounts Offset in the Balance Sheet | (8,103) |
Net Amounts of Assets Presented in the Balance Sheet | 10,714 |
Gross Amounts of Recognized (Liabilities) | (12,283) |
Gross Amounts Offset in the Balance Sheet | 8,103 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (4,180) |
Commodity | Basis Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,815 | 12,535
Gross Amounts Offset in the Balance Sheet | (6,673) | (9,437)
Net Amounts of Assets Presented in the Balance Sheet | (4,858) | 3,098
Gross Amounts of Recognized (Liabilities) | (9,580) | (687)
Gross Amounts Offset in the Balance Sheet | 6,673 | 9,437
Net Amounts of (Liabilities) Presented in the Balance Sheet | (2,907) | 8,750
Commodity | Collars | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,039 | 6,298
Gross Amounts Offset in the Balance Sheet | (500) | (6,298)
Net Amounts of Assets Presented in the Balance Sheet | 2,539 | 0
Gross Amounts of Recognized (Liabilities) | 0 | (2,625)
Gross Amounts Offset in the Balance Sheet | 500 | 6,298
Net Amounts of (Liabilities) Presented in the Balance Sheet | 500 | 3,673
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) | 0 |
Gross Amounts Offset in the Balance Sheet | 85 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | 85 |
Commodity | Spread Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 12,762 | 17,396
Gross Amounts Offset in the Balance Sheet | (12,762) | (17,396)
Net Amounts of Assets Presented in the Balance Sheet | 0 | 0
Gross Amounts of Recognized (Liabilities) | (13,983) | (18,138)
Gross Amounts Offset in the Balance Sheet | 12,762 | 17,396
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ (1,221) | (742)
Commodity | Puts | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 18,159
Gross Amounts Offset in the Balance Sheet |  | (15,429)
Net Amounts of Assets Presented in the Balance Sheet |  | 2,730
Gross Amounts of Recognized (Liabilities) |  | 0
Gross Amounts Offset in the Balance Sheet |  | 15,429
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | 15,429
Commodity | Calls | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized (Liabilities) |  | (1,041)
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | $ (1,041)

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