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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 | Sep. 30, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 76,058 | $ 33,360
Gross Amounts Offset in the Balance Sheet | (14,250) | (19,706)
Net Amounts of Assets Presented in the Balance Sheet | 61,808 | 13,654
Gross Amounts of Recognized (Liabilities) | (14,250) | (45,929)
Gross Amounts Offset in the Balance Sheet | 14,250 | 19,706
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | (26,223)
Natural gas | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 29,609 | 4,240
Gross Amounts Offset in the Balance Sheet | (339) | (1,218)
Net Amounts of Assets Presented in the Balance Sheet | 29,270 | 3,022
Gross Amounts of Recognized (Liabilities) | (339) | (4,790)
Gross Amounts Offset in the Balance Sheet | 339 | 1,218
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | (3,572)
Natural gas | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 15,295 | 16,057
Gross Amounts Offset in the Balance Sheet | (1,447) | (7,671)
Net Amounts of Assets Presented in the Balance Sheet | 13,848 | 8,386
Gross Amounts of Recognized (Liabilities) | (1,447) | (13,345)
Gross Amounts Offset in the Balance Sheet | 1,447 | 7,671
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | (5,674)
Natural gas | Basis Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 8,720 | 7,686
Gross Amounts Offset in the Balance Sheet | (10,189) | (7,686)
Net Amounts of Assets Presented in the Balance Sheet | (1,469) |
Gross Amounts of Recognized (Liabilities) | (10,189) | (3,756)
Gross Amounts Offset in the Balance Sheet | 10,189 | 7,686
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | 3,930
Crude oil | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 15,504 | 3,567
Gross Amounts Offset in the Balance Sheet | (7) | (1,321)
Net Amounts of Assets Presented in the Balance Sheet | 15,497 | 2,246
Gross Amounts of Recognized (Liabilities) | (7) | (4,711)
Gross Amounts Offset in the Balance Sheet | 7 | 1,321
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | (3,390)
Crude oil | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 123 |
Net Amounts of Assets Presented in the Balance Sheet | 123 |
Gross Amounts of Recognized (Liabilities) |  | (398)
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | (398)
Commodity Contract NGLs (C3 - Propane) | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,499 | 826
Gross Amounts Offset in the Balance Sheet | (2,268) | (826)
Net Amounts of Assets Presented in the Balance Sheet | (769) |
Gross Amounts of Recognized (Liabilities) | (2,268) | (18,172)
Gross Amounts Offset in the Balance Sheet | 2,268 | 826
Net Amounts of (Liabilities) Presented in the Balance Sheet | 0 | (17,346)
Commodity Contract NGLs (NC4 - Normal Butane) | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,942 | 863
Gross Amounts Offset in the Balance Sheet |  | (863)
Net Amounts of Assets Presented in the Balance Sheet | 1,942 |
Gross Amounts of Recognized (Liabilities) |  | (757)
Gross Amounts Offset in the Balance Sheet |  | 863
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | 106
Commodity Contract NGLs (C5 - Natural Gasoline) | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,366 | 121
Gross Amounts Offset in the Balance Sheet |  | (121)
Net Amounts of Assets Presented in the Balance Sheet | 3,366 |
Gross Amounts Offset in the Balance Sheet |  | 121
Net Amounts of (Liabilities) Presented in the Balance Sheet |  | $ 121

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