Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 46,693	$ 124,647
Gross Amounts Offset in the Balance Sheet	(45,476)	(65,767)
Net Amounts of Assets Presented in the Balance Sheet	1,217	58,880
Gross Amounts of Recognized (Liabilities)	(154,483)	(119,789)
Gross Amounts Offset in the Balance Sheet	45,476	65,767
Net Amounts of (Liabilities) Presented in the Balance Sheet	(109,007)	(54,022)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,503	87,794
Gross Amounts Offset in the Balance Sheet	(4,745)	(4,106)
Net Amounts of Assets Presented in the Balance Sheet	1,758	83,688
Gross Amounts of Recognized (Liabilities)	(10,030)	(216)
Gross Amounts Offset in the Balance Sheet	4,745	4,106
Net Amounts of (Liabilities) Presented in the Balance Sheet	(5,285)	3,890
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	0	2
Gross Amounts Offset in the Balance Sheet	(799)	(7,928)
Net Amounts of Assets Presented in the Balance Sheet	(799)	(7,926)
Gross Amounts of Recognized (Liabilities)	(57,424)	(24,726)
Gross Amounts Offset in the Balance Sheet	799	7,928
Net Amounts of (Liabilities) Presented in the Balance Sheet	(56,625)	(16,798)
Commodity \| Swaps \| NGLs (C2-Ethane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		57
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		57
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	3	0
Gross Amounts Offset in the Balance Sheet	(3)	(12,556)
Net Amounts of Assets Presented in the Balance Sheet	0	(12,556)
Gross Amounts of Recognized (Liabilities)	(20,363)	(34,325)
Gross Amounts Offset in the Balance Sheet	3	12,556
Net Amounts of (Liabilities) Presented in the Balance Sheet	(20,360)	(21,769)
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets	301	276
Gross Amounts Offset in the Balance Sheet	(301)	(276)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized (Liabilities)	0	0
Gross Amounts Offset in the Balance Sheet	301	276
Net Amounts of (Liabilities) Presented in the Balance Sheet	301	276
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		0
Gross Amounts Offset in the Balance Sheet		(6,051)
Net Amounts of Assets Presented in the Balance Sheet		(6,051)
Gross Amounts of Recognized (Liabilities)	(8,223)	(11,188)
Gross Amounts Offset in the Balance Sheet	0	6,051
Net Amounts of (Liabilities) Presented in the Balance Sheet	(8,223)	(5,137)
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets		0
Gross Amounts Offset in the Balance Sheet		(6,727)
Net Amounts of Assets Presented in the Balance Sheet		(6,727)
Gross Amounts of Recognized (Liabilities)	(14,937)	(13,488)
Gross Amounts Offset in the Balance Sheet	0	6,727
Net Amounts of (Liabilities) Presented in the Balance Sheet	(14,937)	(6,761)
Commodity \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,893	18,817
Gross Amounts Offset in the Balance Sheet	(12,700)	(8,103)
Net Amounts of Assets Presented in the Balance Sheet	193	10,714
Gross Amounts of Recognized (Liabilities)	(8,759)	(12,283)
Gross Amounts Offset in the Balance Sheet	12,700	8,103
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,941	(4,180)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,246	1,815
Gross Amounts Offset in the Balance Sheet	(1,112)	(6,673)
Net Amounts of Assets Presented in the Balance Sheet	134	(4,858)
Gross Amounts of Recognized (Liabilities)	(2,548)	(9,580)
Gross Amounts Offset in the Balance Sheet	1,112	6,673
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,436)	(2,907)
Commodity \| Collars \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets		3,039
Gross Amounts Offset in the Balance Sheet		(500)
Net Amounts of Assets Presented in the Balance Sheet		2,539
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		500
Net Amounts of (Liabilities) Presented in the Balance Sheet		500
Commodity \| Collars \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(69)
Net Amounts of Assets Presented in the Balance Sheet	(69)
Gross Amounts of Recognized (Liabilities)	(717)
Gross Amounts Offset in the Balance Sheet	69
Net Amounts of (Liabilities) Presented in the Balance Sheet	(648)
Commodity \| Collars \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		85
Gross Amounts Offset in the Balance Sheet		(85)
Net Amounts of Assets Presented in the Balance Sheet		0
Gross Amounts of Recognized (Liabilities)	(3,237)	0
Gross Amounts Offset in the Balance Sheet	0	85
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,237)	85
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	25,747	12,762
Gross Amounts Offset in the Balance Sheet	(25,747)	(12,762)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized (Liabilities)	(27,741)	(13,983)
Gross Amounts Offset in the Balance Sheet	25,747	12,762
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,994)	$ (1,221)
Commodity \| Calls \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(504)
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (504)

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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