Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 223,140	$ 304,350
Gross Amounts Offset in the Balance Sheet	(43,320)	(15,588)
Net Amounts of Assets Presented in the Balance Sheet	179,820	288,762
Gross Amounts of Recognized (Liabilities)	(54,531)	(16,745)
Gross Amounts Offset in the Balance Sheet	43,320	15,588
Net Amounts of (Liabilities) Presented in the Balance Sheet	(11,211)	(1,157)
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	68,069	219,357
Gross Amounts Offset in the Balance Sheet	(24,934)	(10,245)
Net Amounts of Assets Presented in the Balance Sheet	43,135	209,112
Gross Amounts of Recognized (Liabilities)	(31,557)	(10,245)
Gross Amounts Offset in the Balance Sheet	24,934	10,245
Net Amounts of (Liabilities) Presented in the Balance Sheet	(6,623)	0
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,066	8,251
Gross Amounts Offset in the Balance Sheet	(1,191)	(2,765)
Net Amounts of Assets Presented in the Balance Sheet	13,875	5,486
Gross Amounts of Recognized (Liabilities)	(1,278)	(2,786)
Gross Amounts Offset in the Balance Sheet	1,191	2,765
Net Amounts of (Liabilities) Presented in the Balance Sheet	(87)	(21)
Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,086
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	15,086
Natural Gas \| Puts
Derivative [Line Items]
Gross Amounts of Recognized Assets	50,792
Gross Amounts Offset in the Balance Sheet	(145)
Net Amounts of Assets Presented in the Balance Sheet	50,647
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	145
Net Amounts of (Liabilities) Presented in the Balance Sheet	145
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	29,696	38,699
Gross Amounts Offset in the Balance Sheet	(1,292)	0
Net Amounts of Assets Presented in the Balance Sheet	28,404	38,699
Gross Amounts of Recognized (Liabilities)	(2,456)
Gross Amounts Offset in the Balance Sheet	1,292
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,164)
Crude Oil \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,416
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	2,416
Commodity Contract NGLs (C2 - Ethane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,332
Gross Amounts Offset in the Balance Sheet	(185)
Net Amounts of Assets Presented in the Balance Sheet	6,147
Gross Amounts of Recognized (Liabilities)	(185)
Gross Amounts Offset in the Balance Sheet	185
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,535	15,884
Gross Amounts Offset in the Balance Sheet	(3,719)	0
Net Amounts of Assets Presented in the Balance Sheet	4,816	15,884
Gross Amounts of Recognized (Liabilities)	(3,538)
Gross Amounts Offset in the Balance Sheet	3,719
Net Amounts of (Liabilities) Presented in the Balance Sheet	181
Commodity Contract NGLs (C3 - Propane) \| Spread Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,585	2,497
Gross Amounts Offset in the Balance Sheet	(8,506)	(2,497)
Net Amounts of Assets Presented in the Balance Sheet	4,079	0
Gross Amounts of Recognized (Liabilities)	(8,506)	(3,633)
Gross Amounts Offset in the Balance Sheet	8,506	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	1,282	6,968
Gross Amounts Offset in the Balance Sheet	(371)	0
Net Amounts of Assets Presented in the Balance Sheet	911	6,968
Gross Amounts of Recognized (Liabilities)	(2,407)
Gross Amounts Offset in the Balance Sheet	371
Net Amounts of (Liabilities) Presented in the Balance Sheet	(2,036)
Commodity Contract NGLs (iC4-isobutane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,557
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	3,557
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,722	12,694
Gross Amounts Offset in the Balance Sheet	(2,820)	(81)
Net Amounts of Assets Presented in the Balance Sheet	6,902	12,613
Gross Amounts of Recognized (Liabilities)	(4,447)	(81)
Gross Amounts Offset in the Balance Sheet	2,820	81
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,627)	$ 0
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	2
Gross Amounts Offset in the Balance Sheet	(157)
Net Amounts of Assets Presented in the Balance Sheet	(155)
Gross Amounts of Recognized (Liabilities)	(157)
Gross Amounts Offset in the Balance Sheet	157
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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