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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 | Dec. 31, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 33,360 | $ 165,076
Gross Amounts Offset in the Balance Sheet | (19,706) | (11,809)
Net Amounts of Assets Presented in the Balance Sheet | 13,654 | 153,267
Gross Amounts of Recognized (Liabilities) | (45,929) | (19,743)
Gross Amounts Offset in the Balance Sheet | 19,706 | 11,809
Net Amounts of (Liabilities) Presented in the Balance Sheet | (26,223) | (7,934)
Natural gas | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 4,240 | 10,746
Gross Amounts Offset in the Balance Sheet | (1,218) | (3,242)
Net Amounts of Assets Presented in the Balance Sheet | 3,022 | 7,504
Gross Amounts of Recognized (Liabilities) | (4,790) | (3,242)
Gross Amounts Offset in the Balance Sheet | 1,218 | 3,242
Net Amounts of (Liabilities) Presented in the Balance Sheet | (3,572) |
Natural gas | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 16,057 | 128,410
Gross Amounts Offset in the Balance Sheet | (7,671) | (6,155)
Net Amounts of Assets Presented in the Balance Sheet | 8,386 | 122,255
Gross Amounts of Recognized (Liabilities) | (13,345) | (9,618)
Gross Amounts Offset in the Balance Sheet | 7,671 | 6,155
Net Amounts of (Liabilities) Presented in the Balance Sheet | (5,674) | (3,463)
Natural gas | Basis Swap |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 7,686 | 993
Gross Amounts Offset in the Balance Sheet | (7,686) |
Net Amounts of Assets Presented in the Balance Sheet |  | 993
Gross Amounts of Recognized (Liabilities) | (3,756) |
Gross Amounts Offset in the Balance Sheet | 7,686 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | 3,930 |
Crude oil | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,567 | 9,650
Gross Amounts Offset in the Balance Sheet | (1,321) |
Net Amounts of Assets Presented in the Balance Sheet | 2,246 | 9,650
Gross Amounts of Recognized (Liabilities) | (4,711) |
Gross Amounts Offset in the Balance Sheet | 1,321 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (3,390) |
Crude oil | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets |  | 2,222
Net Amounts of Assets Presented in the Balance Sheet |  | 2,222
Gross Amounts of Recognized (Liabilities) | (398) |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (398) |
Swap NGLs (Natural Gasoline) | C3 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 826 |
Gross Amounts Offset in the Balance Sheet | (826) |
Gross Amounts of Recognized (Liabilities) | (18,172) | (6,746)
Gross Amounts Offset in the Balance Sheet | 826 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | (17,346) | (6,746)
Swap NGLs (Natural Gasoline) | C4 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 863 |
Gross Amounts Offset in the Balance Sheet | (863) |
Gross Amounts of Recognized (Liabilities) | (757) |
Gross Amounts Offset in the Balance Sheet | 863 |
Net Amounts of (Liabilities) Presented in the Balance Sheet | 106 |
Swap NGLs (Natural Gasoline) | C5 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 121 | 13,055
Gross Amounts Offset in the Balance Sheet | (121) | (2,412)
Net Amounts of Assets Presented in the Balance Sheet |  | 10,643
Gross Amounts of Recognized (Liabilities) |  | (137)
Gross Amounts Offset in the Balance Sheet | 121 | 2,412
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ 121 | $ 2,275

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