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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 | Jun. 30, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | $ 31,102 | $ 33,360
Gross Amounts Offset in the Balance Sheet | (20,879) | (19,706)
Net Amounts of Assets Presented in the Balance Sheet | 10,223 | 13,654
Gross Amounts of Recognized (Liabilities) | (90,945) | (45,929)
Gross Amounts Offset in the Balance Sheet | 20,879 | 19,706
Net Amounts of (Liabilities) Presented in the Balance Sheet | (70,066) | (26,223)
Natural gas | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 4,967 | 4,240
Gross Amounts Offset in the Balance Sheet | (1,606) | (1,218)
Net Amounts of Assets Presented in the Balance Sheet | 3,361 | 3,022
Gross Amounts of Recognized (Liabilities) | (19,095) | (4,790)
Gross Amounts Offset in the Balance Sheet | 1,606 | 1,218
Net Amounts of (Liabilities) Presented in the Balance Sheet | (17,489) | (3,572)
Natural gas | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 3,594 | 16,057
Gross Amounts Offset in the Balance Sheet | (3,826) | (7,671)
Net Amounts of Assets Presented in the Balance Sheet | (232) | 8,386
Gross Amounts of Recognized (Liabilities) | (15,750) | (13,345)
Gross Amounts Offset in the Balance Sheet | 3,826 | 7,671
Net Amounts of (Liabilities) Presented in the Balance Sheet | (11,924) | (5,674)
Natural gas | Basis Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 19,606 | 7,686
Gross Amounts Offset in the Balance Sheet | (9,559) | (7,686)
Net Amounts of Assets Presented in the Balance Sheet | 10,047 |
Gross Amounts of Recognized (Liabilities) | (10,934) | (3,756)
Gross Amounts Offset in the Balance Sheet | 9,559 | 7,686
Net Amounts of (Liabilities) Presented in the Balance Sheet | (1,375) | 3,930
Crude oil | Swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 84 | 3,567
Gross Amounts Offset in the Balance Sheet | (2,305) | (1,321)
Net Amounts of Assets Presented in the Balance Sheet | (2,221) | 2,246
Gross Amounts of Recognized (Liabilities) | (36,628) | (4,711)
Gross Amounts Offset in the Balance Sheet | 2,305 | 1,321
Net Amounts of (Liabilities) Presented in the Balance Sheet | (34,323) | (3,390)
Crude oil | Collars |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized (Liabilities) | (1,693) | (398)
Net Amounts of (Liabilities) Presented in the Balance Sheet | (1,693) | (398)
Swap NGLs (Natural Gasoline) | C3 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,538 | 826
Gross Amounts Offset in the Balance Sheet | (2,160) | (826)
Net Amounts of Assets Presented in the Balance Sheet | (622) |
Gross Amounts of Recognized (Liabilities) | (6,246) | (18,172)
Gross Amounts Offset in the Balance Sheet | 2,160 | 826
Net Amounts of (Liabilities) Presented in the Balance Sheet | (4,086) | (17,346)
Swap NGLs (Natural Gasoline) | NC4 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 1,227 | 863
Gross Amounts Offset in the Balance Sheet | (1,227) | (863)
Gross Amounts of Recognized (Liabilities) | (120) | (757)
Gross Amounts Offset in the Balance Sheet | 1,227 | 863
Net Amounts of (Liabilities) Presented in the Balance Sheet | 1,107 | 106
Swap NGLs (Natural Gasoline) | C5 swaps |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized Assets | 86 | 121
Gross Amounts Offset in the Balance Sheet | (196) | (121)
Net Amounts of Assets Presented in the Balance Sheet | (110) |
Gross Amounts of Recognized (Liabilities) | (479) |
Gross Amounts Offset in the Balance Sheet | 196 | 121
Net Amounts of (Liabilities) Presented in the Balance Sheet | $ (283) | $ 121

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