Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 83,612	$ 304,350
Gross Amounts Offset in the Balance Sheet	(39,549)	(15,588)
Net Amounts of Assets Presented in the Balance Sheet	44,063	288,762
Gross Amounts of Recognized (Liabilities)	(79,441)	(16,745)
Gross Amounts Offset in the Balance Sheet	39,549	15,588
Net Amounts of (Liabilities) Presented in the Balance Sheet	(39,892)	(1,157)
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	48,702	219,357
Gross Amounts Offset in the Balance Sheet	(14,875)	(10,245)
Net Amounts of Assets Presented in the Balance Sheet	33,827	209,112
Gross Amounts of Recognized (Liabilities)	(50,780)	(10,245)
Gross Amounts Offset in the Balance Sheet	14,875	10,245
Net Amounts of (Liabilities) Presented in the Balance Sheet	(35,905)	0
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,621	8,251
Gross Amounts Offset in the Balance Sheet	(6,942)	(2,765)
Net Amounts of Assets Presented in the Balance Sheet	(3,321)	5,486
Gross Amounts of Recognized (Liabilities)	(7,446)	(2,786)
Gross Amounts Offset in the Balance Sheet	6,942	2,765
Net Amounts of (Liabilities) Presented in the Balance Sheet	(504)	(21)
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,472	38,699
Gross Amounts Offset in the Balance Sheet	(5,312)	0
Net Amounts of Assets Presented in the Balance Sheet	7,160	38,699
Gross Amounts of Recognized (Liabilities)	(4,108)
Gross Amounts Offset in the Balance Sheet	5,312
Net Amounts of (Liabilities) Presented in the Balance Sheet	1,204
Commodity Contract NGLs (C2 - Ethane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	51
Gross Amounts Offset in the Balance Sheet	(201)
Net Amounts of Assets Presented in the Balance Sheet	(150)
Gross Amounts of Recognized (Liabilities)	(1,252)
Gross Amounts Offset in the Balance Sheet	201
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,051)
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,999	15,884
Gross Amounts Offset in the Balance Sheet	(1,391)	0
Net Amounts of Assets Presented in the Balance Sheet	608	15,884
Gross Amounts of Recognized (Liabilities)	(2,101)
Gross Amounts Offset in the Balance Sheet	1,391
Net Amounts of (Liabilities) Presented in the Balance Sheet	(710)
Commodity Contract NGLs (C3 - Propane) \| Spread Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	11,964	2,497
Gross Amounts Offset in the Balance Sheet	(8,394)	(2,497)
Net Amounts of Assets Presented in the Balance Sheet	3,570	0
Gross Amounts of Recognized (Liabilities)	(7,988)	(3,633)
Gross Amounts Offset in the Balance Sheet	8,394	2,497
Net Amounts of (Liabilities) Presented in the Balance Sheet	406	(1,136)
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	522	6,968
Gross Amounts Offset in the Balance Sheet	(86)	0
Net Amounts of Assets Presented in the Balance Sheet	436	6,968
Gross Amounts of Recognized (Liabilities)	(2,567)
Gross Amounts Offset in the Balance Sheet	86
Net Amounts of (Liabilities) Presented in the Balance Sheet	(2,481)
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,281	12,694
Gross Amounts Offset in the Balance Sheet	(2,314)	(81)
Net Amounts of Assets Presented in the Balance Sheet	1,967	12,613
Gross Amounts of Recognized (Liabilities)	(3,165)	(81)
Gross Amounts Offset in the Balance Sheet	2,314	81
Net Amounts of (Liabilities) Presented in the Balance Sheet	(851)	$ 0
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(34)
Net Amounts of Assets Presented in the Balance Sheet	(34)
Gross Amounts of Recognized (Liabilities)	(34)
Gross Amounts Offset in the Balance Sheet	34
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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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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