Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 277,171	$ 304,350
Gross Amounts Offset in the Balance Sheet	(10,662)	(15,588)
Net Amounts of Assets Presented in the Balance Sheet	266,509	288,762
Gross Amounts of Recognized (Liabilities)	(12,124)	(16,745)
Gross Amounts Offset in the Balance Sheet	10,662	15,588
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,462)	(1,157)
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	214,389	219,357
Gross Amounts Offset in the Balance Sheet	(1,943)	(10,245)
Net Amounts of Assets Presented in the Balance Sheet	212,446	209,112
Gross Amounts of Recognized (Liabilities)	(3,399)	(10,245)
Gross Amounts Offset in the Balance Sheet	1,943	10,245
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,456)	0
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,327	8,251
Gross Amounts Offset in the Balance Sheet	(2,648)	(2,765)
Net Amounts of Assets Presented in the Balance Sheet	679	5,486
Gross Amounts of Recognized (Liabilities)	(2,686)	(2,786)
Gross Amounts Offset in the Balance Sheet	2,648	2,765
Net Amounts of (Liabilities) Presented in the Balance Sheet	(38)	(21)
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	29,273	38,699
Gross Amounts Offset in the Balance Sheet	(183)	0
Net Amounts of Assets Presented in the Balance Sheet	29,090	38,699
Gross Amounts of Recognized (Liabilities)	(81)
Gross Amounts Offset in the Balance Sheet	183
Net Amounts of (Liabilities) Presented in the Balance Sheet	102
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,380	15,884
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	8,380	15,884
Commodity Contract NGLs (C3 - Propane) \| Spread Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	7,373	2,497
Gross Amounts Offset in the Balance Sheet	(4,916)	(2,497)
Net Amounts of Assets Presented in the Balance Sheet	2,457	0
Gross Amounts of Recognized (Liabilities)	(4,916)	(3,633)
Gross Amounts Offset in the Balance Sheet	4,916	2,497
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(1,136)
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,972	6,968
Gross Amounts Offset in the Balance Sheet	(199)	0
Net Amounts of Assets Presented in the Balance Sheet	4,773	6,968
Gross Amounts of Recognized (Liabilities)	(199)
Gross Amounts Offset in the Balance Sheet	199
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,457	12,694
Gross Amounts Offset in the Balance Sheet	(762)	(81)
Net Amounts of Assets Presented in the Balance Sheet	8,695	12,613
Gross Amounts of Recognized (Liabilities)	(832)	(81)
Gross Amounts Offset in the Balance Sheet	762	81
Net Amounts of (Liabilities) Presented in the Balance Sheet	(70)	$ 0
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(11)
Net Amounts of Assets Presented in the Balance Sheet	(11)
Gross Amounts of Recognized (Liabilities)	(11)
Gross Amounts Offset in the Balance Sheet	11
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ 0

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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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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