Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 304,350	$ 404,118
Gross Amounts Offset in the Balance Sheet	(15,588)	(755)
Net Amounts of Assets Presented in the Balance Sheet	288,762	403,363
Gross Amounts of Recognized (Liabilities)	(16,745)	(755)
Gross Amounts Offset in the Balance Sheet	15,588	755
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,157)	0
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	219,357	198,740
Gross Amounts Offset in the Balance Sheet	(10,245)	0
Net Amounts of Assets Presented in the Balance Sheet	209,112	198,740
Gross Amounts of Recognized (Liabilities)	(10,245)
Gross Amounts Offset in the Balance Sheet	10,245
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets		57,460
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		57,460
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,251	2,442
Gross Amounts Offset in the Balance Sheet	(2,765)	(755)
Net Amounts of Assets Presented in the Balance Sheet	5,486	1,687
Gross Amounts of Recognized (Liabilities)	(2,786)	(755)
Gross Amounts Offset in the Balance Sheet	2,765	755
Net Amounts of (Liabilities) Presented in the Balance Sheet	(21)	0
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	38,699	128,578
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	38,699	128,578
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,884	14,727
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	15,884	14,727
Commodity Contract NGLs (C3 - Propane) \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,497
Gross Amounts Offset in the Balance Sheet	(2,497)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	(3,633)
Gross Amounts Offset in the Balance Sheet	2,497
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,136)
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets		2,171
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		$ 2,171
Gross Amounts of Recognized (Liabilities)	(81)
Gross Amounts Offset in the Balance Sheet	81
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity Contract NGLs (C4 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,968
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	6,968
Commodity Contract NGLs (C5 - Natural Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,694
Gross Amounts Offset in the Balance Sheet	(81)
Net Amounts of Assets Presented in the Balance Sheet	$ 12,613

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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