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Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 122,624 | $ 124,647
Gross Amounts Offset in the Balance Sheet | (29,829) | (65,767)
Net Amounts of Assets Presented in the Balance Sheet | 92,795 | 58,880
Gross Amounts of Recognized (Liabilities) | (37,435) | (119,789)
Gross Amounts Offset in the Balance Sheet | 29,829 | 65,767
Net Amounts of (Liabilities) Presented in the Balance Sheet | (7,606) | (54,022)
Commodity | Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 20,834 | 87,794
Gross Amounts Offset in the Balance Sheet | (11,748) | (4,106)
Net Amounts of Assets Presented in the Balance Sheet | 9,086 | 83,688
Gross Amounts of Recognized (Liabilities) | (18,332) | (216)
Gross Amounts Offset in the Balance Sheet | 11,748 | 4,106
Net Amounts of (Liabilities) Presented in the Balance Sheet | (6,584) | 3,890
Commodity | Swaps | Crude Oil |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 26,481 | 2
Gross Amounts Offset in the Balance Sheet | (651) | (7,928)
Net Amounts of Assets Presented in the Balance Sheet | 25,830 | (7,926)
Gross Amounts of Recognized (Liabilities) | 0 | (24,726)
Gross Amounts Offset in the Balance Sheet | 651 | 7,928
Net Amounts of (Liabilities) Presented in the Balance Sheet | 651 | (16,798)
Commodity | Swaps | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 18,719 | 0
Gross Amounts Offset in the Balance Sheet | (589) | (12,556)
Net Amounts of Assets Presented in the Balance Sheet | 18,130 | (12,556)
Gross Amounts of Recognized (Liabilities) | 0 | (34,325)
Gross Amounts Offset in the Balance Sheet | 589 | 12,556
Net Amounts of (Liabilities) Presented in the Balance Sheet | 589 | (21,769)
Commodity | Swaps | NGLs (NC4-Normal Butane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 4,084 | 0
Gross Amounts Offset in the Balance Sheet | 0 | (6,051)
Net Amounts of Assets Presented in the Balance Sheet | 4,084 | (6,051)
Gross Amounts of Recognized (Liabilities) |  | (11,188)
Gross Amounts Offset in the Balance Sheet |  | 6,051
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | (5,137)
Commodity | Swaps | NGLs (C5-Natural Gasoline) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 17,371 | 0
Gross Amounts Offset in the Balance Sheet | 0 | (6,727)
Net Amounts of Assets Presented in the Balance Sheet | 17,371 | (6,727)
Gross Amounts of Recognized (Liabilities) |  | (13,488)
Gross Amounts Offset in the Balance Sheet |  | 6,727
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | (6,761)
Commodity | Swaps | Freight |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 0 | 276
Gross Amounts Offset in the Balance Sheet | (561) | (276)
Net Amounts of Assets Presented in the Balance Sheet | (561) | 0
Gross Amounts of Recognized (Liabilities) | (561) | 0
Gross Amounts Offset in the Balance Sheet | 561 | 276
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | 276
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 | Swaptions | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 5,200 | 18,817
Gross Amounts Offset in the Balance Sheet | (3,883) | (8,103)
Net Amounts of Assets Presented in the Balance Sheet | 1,317 | 10,714
Gross Amounts of Recognized (Liabilities) | (7,972) | (12,283)
Gross Amounts Offset in the Balance Sheet | 3,883 | 8,103
Net Amounts of (Liabilities) Presented in the Balance Sheet | (4,089) | (4,180)
Commodity | Basis Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 6,468 | 1,815
Gross Amounts Offset in the Balance Sheet | (2,822) | (6,673)
Net Amounts of Assets Presented in the Balance Sheet | 3,646 | (4,858)
Gross Amounts of Recognized (Liabilities) | (1,702) | (9,580)
Gross Amounts Offset in the Balance Sheet | 2,822 | 6,673
Net Amounts of (Liabilities) Presented in the Balance Sheet | 1,120 | (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 | 5,945 |
Gross Amounts Offset in the Balance Sheet | (707) |
Net Amounts of Assets Presented in the Balance Sheet | 5,238 |
Gross Amounts of Recognized (Liabilities) | 0 |
Gross Amounts Offset in the Balance Sheet | 707 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | 707 |
Commodity | Collars | NGLs (C3-Propane) |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 8,538 | 85
Gross Amounts Offset in the Balance Sheet | 0 | (85)
Net Amounts of Assets Presented in the Balance Sheet | 8,538 | 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 | 8,984 | 12,762
Gross Amounts Offset in the Balance Sheet | (8,868) | (12,762)
Net Amounts of Assets Presented in the Balance Sheet | 116 | 0
Gross Amounts of Recognized (Liabilities) | (8,868) | (13,983)
Gross Amounts Offset in the Balance Sheet | 8,868 | 12,762
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ 0 | $ (1,221)

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