Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 432,790	$ 404,118
Gross Amounts Offset in the Balance Sheet	(2,935)	(755)
Net Amounts of Assets Presented in the Balance Sheet	429,855	403,363
Gross Amounts of Recognized (Liabilities)	(4,077)	(755)
Gross Amounts Offset in the Balance Sheet	2,935	755
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,142)	0
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	242,156	198,740
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	242,156	198,740
Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	51,439	57,460
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	51,439	57,460
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,211	2,442
Gross Amounts Offset in the Balance Sheet	(1,487)	(755)
Net Amounts of Assets Presented in the Balance Sheet	(276)	1,687
Gross Amounts of Recognized (Liabilities)	(2,629)	(755)
Gross Amounts Offset in the Balance Sheet	1,487	755
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,142)	0
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	113,693	128,578
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	113,693	128,578
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,883	14,727
Gross Amounts Offset in the Balance Sheet	(1,448)	0
Net Amounts of Assets Presented in the Balance Sheet	14,435	14,727
Gross Amounts of Recognized (Liabilities)	(1,448)
Gross Amounts Offset in the Balance Sheet	1,448
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,687
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	4,687
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,721	2,171
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	$ 3,721	$ 2,171

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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