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Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 25,013 | $ 33,360
Gross Amounts Offset in the Balance Sheet | (9,016) | (19,706)
Net Amounts of Assets Presented in the Balance Sheet | 15,997 | 13,654
Gross Amounts of Recognized (Liabilities) | (82,012) | (45,929)
Gross Amounts Offset in the Balance Sheet | 9,016 | 19,706
Net Amounts of (Liabilities) Presented in the Balance Sheet | (72,996) | (26,223)
Natural gas | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 8,347 | 4,240
Gross Amounts Offset in the Balance Sheet |  | (1,218)
Net Amounts of Assets Presented in the Balance Sheet | 8,347 | 3,022
Gross Amounts of Recognized (Liabilities) | (27,720) | (4,790)
Gross Amounts Offset in the Balance Sheet |  | 1,218
Net Amounts of (Liabilities) Presented in the Balance Sheet | (27,720) | (3,572)
Natural gas | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 7,328 | 16,057
Gross Amounts Offset in the Balance Sheet | (584) | (7,671)
Net Amounts of Assets Presented in the Balance Sheet | 6,744 | 8,386
Gross Amounts of Recognized (Liabilities) | (26,738) | (13,345)
Gross Amounts Offset in the Balance Sheet | 584 | 7,671
Net Amounts of (Liabilities) Presented in the Balance Sheet | (26,154) | (5,674)
Natural gas | Basis Swap |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,123 | 7,686
Gross Amounts Offset in the Balance Sheet | (3,123) | (7,686)
Net Amounts of Assets Presented in the Balance Sheet |  |
Gross Amounts of Recognized (Liabilities) | (6,762) | (3,756)
Gross Amounts Offset in the Balance Sheet | 3,123 | 7,686
Net Amounts of (Liabilities) Presented in the Balance Sheet | (3,639) | 3,930
Crude oil | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,179 | 3,567
Gross Amounts Offset in the Balance Sheet | (273) | (1,321)
Net Amounts of Assets Presented in the Balance Sheet | 906 | 2,246
Gross Amounts of Recognized (Liabilities) | (10,027) | (4,711)
Gross Amounts Offset in the Balance Sheet | 273 | 1,321
Net Amounts of (Liabilities) Presented in the Balance Sheet | (9,754) | (3,390)
Crude oil | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized (Liabilities) | (972) | (398)
Gross Amounts Offset in the Balance Sheet |  |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (972) | (398)
Swap NGLs (Natural Gasoline) | C3 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,877 | 826
Gross Amounts Offset in the Balance Sheet | (1,877) | (826)
Net Amounts of Assets Presented in the Balance Sheet |  |
Gross Amounts of Recognized (Liabilities) | (9,692) | (18,172)
Gross Amounts Offset in the Balance Sheet | 1,877 | 826
Net Amounts of (Liabilities) Presented in the Balance Sheet | (7,815) | (17,346)
Swap NGLs (Natural Gasoline) | C4 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,159 | 863
Gross Amounts Offset in the Balance Sheet | (3,159) | (863)
Net Amounts of Assets Presented in the Balance Sheet |  |
Gross Amounts of Recognized (Liabilities) |  | (757)
Gross Amounts Offset in the Balance Sheet | 3,159 | 863
Net Amounts of (Liabilities) Presented in the Balance Sheet | 3,159 | 106
Swap NGLs (Natural Gasoline) | C5 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 121
Gross Amounts Offset in the Balance Sheet |  | (121)
Net Amounts of Assets Presented in the Balance Sheet |  |
Gross Amounts of Recognized (Liabilities) | (101) |
Gross Amounts Offset in the Balance Sheet |  | 121
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ (101) | $ 121

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