Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 404,118	$ 33,360
Gross Amounts Offset in the Balance Sheet	(755)	(19,706)
Net Amounts of Assets Presented in the Balance Sheet	403,363	13,654
Gross Amounts of Recognized (Liabilities)	(755)	(45,929)
Gross Amounts Offset in the Balance Sheet	755	19,706
Net Amounts of (Liabilities) Presented in the Balance Sheet		(26,223)
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	198,740	4,240
Gross Amounts Offset in the Balance Sheet		(1,218)
Net Amounts of Assets Presented in the Balance Sheet	198,740	3,022
Gross Amounts of Recognized (Liabilities)		(4,790)
Gross Amounts Offset in the Balance Sheet		1,218
Net Amounts of (Liabilities) Presented in the Balance Sheet		(3,572)
Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	57,460	16,057
Gross Amounts Offset in the Balance Sheet		(7,671)
Net Amounts of Assets Presented in the Balance Sheet	57,460	8,386
Gross Amounts of Recognized (Liabilities)		(13,345)
Gross Amounts Offset in the Balance Sheet		7,671
Net Amounts of (Liabilities) Presented in the Balance Sheet		(5,674)
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,442	7,686
Gross Amounts Offset in the Balance Sheet	(755)	(7,686)
Net Amounts of Assets Presented in the Balance Sheet	1,687
Gross Amounts of Recognized (Liabilities)	(755)	(3,756)
Gross Amounts Offset in the Balance Sheet	755	7,686
Net Amounts of (Liabilities) Presented in the Balance Sheet		3,930
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	128,578	3,567
Gross Amounts Offset in the Balance Sheet		(1,321)
Net Amounts of Assets Presented in the Balance Sheet	128,578	2,246
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 (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	14,727	826
Gross Amounts Offset in the Balance Sheet		(826)
Net Amounts of Assets Presented in the Balance Sheet	14,727
Gross Amounts of Recognized (Liabilities)		(18,172)
Gross Amounts Offset in the Balance Sheet		826
Net Amounts of (Liabilities) Presented in the Balance Sheet		(17,346)
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,171	121
Gross Amounts Offset in the Balance Sheet		(121)
Net Amounts of Assets Presented in the Balance Sheet	2,171
Gross Amounts Offset in the Balance Sheet		121
Net Amounts of (Liabilities) Presented in the Balance Sheet		121
Commodity Contract NGLs (C4 - Natural Gasoline) \| 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

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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