Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 77,079	$ 304,350
Gross Amounts Offset in the Balance Sheet	(63,596)	(15,588)
Net Amounts of Assets Presented in the Balance Sheet	13,483	288,762
Gross Amounts of Recognized (Liabilities)	(253,096)	(16,745)
Gross Amounts Offset in the Balance Sheet	63,596	15,588
Net Amounts of (Liabilities) Presented in the Balance Sheet	(189,500)	(1,157)
Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	13,213	219,357
Gross Amounts Offset in the Balance Sheet	(11,425)	(10,245)
Net Amounts of Assets Presented in the Balance Sheet	1,788	209,112
Gross Amounts of Recognized (Liabilities)	(158,359)	(10,245)
Gross Amounts Offset in the Balance Sheet	11,425	10,245
Net Amounts of (Liabilities) Presented in the Balance Sheet	(146,934)	0
Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,535	8,251
Gross Amounts Offset in the Balance Sheet	(9,437)	(2,765)
Net Amounts of Assets Presented in the Balance Sheet	3,098	5,486
Gross Amounts of Recognized (Liabilities)	(687)	(2,786)
Gross Amounts Offset in the Balance Sheet	9,437	2,765
Net Amounts of (Liabilities) Presented in the Balance Sheet	8,750	(21)
Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,298
Gross Amounts Offset in the Balance Sheet	(6,298)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	(2,625)
Gross Amounts Offset in the Balance Sheet	6,298
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,673
Natural Gas \| Puts
Derivative [Line Items]
Gross Amounts of Recognized Assets	18,159
Gross Amounts Offset in the Balance Sheet	(15,429)
Net Amounts of Assets Presented in the Balance Sheet	2,730
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	15,429
Net Amounts of (Liabilities) Presented in the Balance Sheet	15,429
Natural Gas \| Calls
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(1,041)
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,041)
Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,356	38,699
Gross Amounts Offset in the Balance Sheet	(3,489)	0
Net Amounts of Assets Presented in the Balance Sheet	5,867	38,699
Gross Amounts of Recognized (Liabilities)	(13,206)
Gross Amounts Offset in the Balance Sheet	3,489
Net Amounts of (Liabilities) Presented in the Balance Sheet	(9,717)
Commodity Contract NGLs (C2 - Ethane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	53
Gross Amounts Offset in the Balance Sheet	(53)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	(1,008)
Gross Amounts Offset in the Balance Sheet	53
Net Amounts of (Liabilities) Presented in the Balance Sheet	(955)
Commodity Contract NGLs (C3 - Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets		15,884
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		15,884
Gross Amounts of Recognized (Liabilities)	(32,437)
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(32,437)
Commodity Contract NGLs (C3 - Propane) \| Spread Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	17,396	2,497
Gross Amounts Offset in the Balance Sheet	(17,396)	(2,497)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized (Liabilities)	(18,138)	(3,633)
Gross Amounts Offset in the Balance Sheet	17,396	2,497
Net Amounts of (Liabilities) Presented in the Balance Sheet	(742)	(1,136)
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	4
Gross Amounts Offset in the Balance Sheet	(4)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	(13,419)
Gross Amounts Offset in the Balance Sheet	4
Net Amounts of (Liabilities) Presented in the Balance Sheet	(13,415)
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	65
Gross Amounts Offset in the Balance Sheet	(65)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	65
Net Amounts of (Liabilities) Presented in the Balance Sheet	65
Commodity Contract NGLs (C5 - Natural Gasoline) \| 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
Gross Amounts of Recognized (Liabilities)	(12,176)	(81)
Gross Amounts Offset in the Balance Sheet	0	81
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (12,176)	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

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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