Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 76,861	$ 124,647
Gross Amounts Offset in the Balance Sheet	(53,729)	(65,767)
Net Amounts of Assets Presented in the Balance Sheet	23,132	58,880
Gross Amounts of Recognized (Liabilities)	(95,967)	(119,789)
Gross Amounts Offset in the Balance Sheet	53,729	65,767
Net Amounts of (Liabilities) Presented in the Balance Sheet	(42,238)	(54,022)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	43,074	87,794
Gross Amounts Offset in the Balance Sheet	(13,076)	(4,106)
Net Amounts of Assets Presented in the Balance Sheet	29,998	83,688
Gross Amounts of Recognized (Liabilities)	(7,255)	(216)
Gross Amounts Offset in the Balance Sheet	13,076	4,106
Net Amounts of (Liabilities) Presented in the Balance Sheet	5,821	3,890
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	31	2
Gross Amounts Offset in the Balance Sheet	(9,497)	(7,928)
Net Amounts of Assets Presented in the Balance Sheet	(9,466)	(7,926)
Gross Amounts of Recognized (Liabilities)	(34,097)	(24,726)
Gross Amounts Offset in the Balance Sheet	9,497	7,928
Net Amounts of (Liabilities) Presented in the Balance Sheet	(24,600)	(16,798)
Commodity \| Swaps \| NGLs (C2-Ethane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	24	57
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	24	57
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	500	0
Gross Amounts Offset in the Balance Sheet	(3,671)	(12,556)
Net Amounts of Assets Presented in the Balance Sheet	(3,171)	(12,556)
Gross Amounts of Recognized (Liabilities)	(15,573)	(34,325)
Gross Amounts Offset in the Balance Sheet	3,671	12,556
Net Amounts of (Liabilities) Presented in the Balance Sheet	(11,902)	(21,769)
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	10	0
Gross Amounts Offset in the Balance Sheet	(1,489)	(6,051)
Net Amounts of Assets Presented in the Balance Sheet	(1,479)	(6,051)
Gross Amounts of Recognized (Liabilities)	(4,093)	(11,188)
Gross Amounts Offset in the Balance Sheet	1,488	6,051
Net Amounts of (Liabilities) Presented in the Balance Sheet	(2,605)	(5,137)
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	0	0
Gross Amounts Offset in the Balance Sheet	(1,342)	(6,727)
Net Amounts of Assets Presented in the Balance Sheet	(1,342)	(6,727)
Gross Amounts of Recognized (Liabilities)	(11,760)	(13,488)
Gross Amounts Offset in the Balance Sheet	1,342	6,727
Net Amounts of (Liabilities) Presented in the Balance Sheet	(10,418)	(6,761)
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets		276
Gross Amounts Offset in the Balance Sheet		(276)
Net Amounts of Assets Presented in the Balance Sheet		0
Gross Amounts of Recognized (Liabilities)	(34)
Gross Amounts Offset in the Balance Sheet	0	276
Net Amounts of (Liabilities) Presented in the Balance Sheet	(34)	276
Commodity \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	20,159	18,817
Gross Amounts Offset in the Balance Sheet	(13,927)	(8,103)
Net Amounts of Assets Presented in the Balance Sheet	6,232	10,714
Gross Amounts of Recognized (Liabilities)	(10,026)	(12,283)
Gross Amounts Offset in the Balance Sheet	13,927	8,103
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,901	(4,180)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,150	1,815
Gross Amounts Offset in the Balance Sheet	(449)	(6,673)
Net Amounts of Assets Presented in the Balance Sheet	2,701	(4,858)
Gross Amounts of Recognized (Liabilities)	(990)	(9,580)
Gross Amounts Offset in the Balance Sheet	449	6,673
Net Amounts of (Liabilities) Presented in the Balance Sheet	(541)	(2,907)
Commodity \| Calls \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(365)
Net Amounts of Assets Presented in the Balance Sheet	(365)
Gross Amounts of Recognized (Liabilities)	(853)
Gross Amounts Offset in the Balance Sheet	365
Net Amounts of (Liabilities) Presented in the Balance Sheet	(488)
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,913	12,762
Gross Amounts Offset in the Balance Sheet	(9,913)	(12,762)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized (Liabilities)	(11,286)	(13,983)
Gross Amounts Offset in the Balance Sheet	9,914	12,762
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (1,372)	(1,221)
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 Offset in the Balance Sheet		500
Net Amounts of (Liabilities) Presented in the Balance Sheet		500
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 Offset in the Balance Sheet		85
Net Amounts of (Liabilities) Presented in the Balance Sheet		$ 85

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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