Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 122,624	$ 124,647
Gross Amounts Offset in the Balance Sheet	(29,829)	(65,767)
Net Amounts of Assets Presented in the Balance Sheet	92,795	58,880
Gross Amounts of Recognized (Liabilities)	(37,435)	(119,789)
Gross Amounts Offset in the Balance Sheet	29,829	65,767
Net Amounts of (Liabilities) Presented in the Balance Sheet	(7,606)	(54,022)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	20,834	87,794
Gross Amounts Offset in the Balance Sheet	(11,748)	(4,106)
Net Amounts of Assets Presented in the Balance Sheet	9,086	83,688
Gross Amounts of Recognized (Liabilities)	(18,332)	(216)
Gross Amounts Offset in the Balance Sheet	11,748	4,106
Net Amounts of (Liabilities) Presented in the Balance Sheet	(6,584)	3,890
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	26,481	2
Gross Amounts Offset in the Balance Sheet	(651)	(7,928)
Net Amounts of Assets Presented in the Balance Sheet	25,830	(7,926)
Gross Amounts of Recognized (Liabilities)	0	(24,726)
Gross Amounts Offset in the Balance Sheet	651	7,928
Net Amounts of (Liabilities) Presented in the Balance Sheet	651	(16,798)
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	18,719	0
Gross Amounts Offset in the Balance Sheet	(589)	(12,556)
Net Amounts of Assets Presented in the Balance Sheet	18,130	(12,556)
Gross Amounts of Recognized (Liabilities)	0	(34,325)
Gross Amounts Offset in the Balance Sheet	589	12,556
Net Amounts of (Liabilities) Presented in the Balance Sheet	589	(21,769)
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,084	0
Gross Amounts Offset in the Balance Sheet	0	(6,051)
Net Amounts of Assets Presented in the Balance Sheet	4,084	(6,051)
Gross Amounts of Recognized (Liabilities)		(11,188)
Gross Amounts Offset in the Balance Sheet		6,051
Net Amounts of (Liabilities) Presented in the Balance Sheet		(5,137)
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	17,371	0
Gross Amounts Offset in the Balance Sheet	0	(6,727)
Net Amounts of Assets Presented in the Balance Sheet	17,371	(6,727)
Gross Amounts of Recognized (Liabilities)		(13,488)
Gross Amounts Offset in the Balance Sheet		6,727
Net Amounts of (Liabilities) Presented in the Balance Sheet		(6,761)
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets	0	276
Gross Amounts Offset in the Balance Sheet	(561)	(276)
Net Amounts of Assets Presented in the Balance Sheet	(561)	0
Gross Amounts of Recognized (Liabilities)	(561)	0
Gross Amounts Offset in the Balance Sheet	561	276
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	276
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 \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,200	18,817
Gross Amounts Offset in the Balance Sheet	(3,883)	(8,103)
Net Amounts of Assets Presented in the Balance Sheet	1,317	10,714
Gross Amounts of Recognized (Liabilities)	(7,972)	(12,283)
Gross Amounts Offset in the Balance Sheet	3,883	8,103
Net Amounts of (Liabilities) Presented in the Balance Sheet	(4,089)	(4,180)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,468	1,815
Gross Amounts Offset in the Balance Sheet	(2,822)	(6,673)
Net Amounts of Assets Presented in the Balance Sheet	3,646	(4,858)
Gross Amounts of Recognized (Liabilities)	(1,702)	(9,580)
Gross Amounts Offset in the Balance Sheet	2,822	6,673
Net Amounts of (Liabilities) Presented in the Balance Sheet	1,120	(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	5,945
Gross Amounts Offset in the Balance Sheet	(707)
Net Amounts of Assets Presented in the Balance Sheet	5,238
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	707
Net Amounts of (Liabilities) Presented in the Balance Sheet	707
Commodity \| Collars \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,538	85
Gross Amounts Offset in the Balance Sheet	0	(85)
Net Amounts of Assets Presented in the Balance Sheet	8,538	0
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		85
Net Amounts of (Liabilities) Presented in the Balance Sheet		85
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,984	12,762
Gross Amounts Offset in the Balance Sheet	(8,868)	(12,762)
Net Amounts of Assets Presented in the Balance Sheet	116	0
Gross Amounts of Recognized (Liabilities)	(8,868)	(13,983)
Gross Amounts Offset in the Balance Sheet	8,868	12,762
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ 0	$ (1,221)

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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