Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 183,633	$ 122,624
Gross Amounts Offset in the Balance Sheet	(26,786)	(29,829)
Net Amounts of Assets Presented in the Balance Sheet	156,847	92,795
Gross Amounts of Recognized (Liabilities)	(28,603)	(37,435)
Gross Amounts Offset in the Balance Sheet	26,786	29,829
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,817)	(7,606)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	102,076	20,834
Gross Amounts Offset in the Balance Sheet	(1,106)	(11,748)
Net Amounts of Assets Presented in the Balance Sheet	100,970	9,086
Gross Amounts of Recognized (Liabilities)	(1,106)	(18,332)
Gross Amounts Offset in the Balance Sheet	1,106	11,748
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(6,584)
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	19,012	26,481
Gross Amounts Offset in the Balance Sheet	(602)	(651)
Net Amounts of Assets Presented in the Balance Sheet	18,410	25,830
Gross Amounts of Recognized (Liabilities)	(602)	0
Gross Amounts Offset in the Balance Sheet	602	651
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	651
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	132	18,719
Gross Amounts Offset in the Balance Sheet	0	(589)
Net Amounts of Assets Presented in the Balance Sheet	132	18,130
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		589
Net Amounts of (Liabilities) Presented in the Balance Sheet		589
Commodity \| Swaps \| NGLs (iC4-Iso Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(2)
Net Amounts of Assets Presented in the Balance Sheet	(2)
Gross Amounts of Recognized (Liabilities)	(2)
Gross Amounts Offset in the Balance Sheet	2
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	160	4,084
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	160	4,084
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,229	17,371
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	5,229	17,371
Commodity \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	27,309	5,200
Gross Amounts Offset in the Balance Sheet	(2,107)	(3,883)
Net Amounts of Assets Presented in the Balance Sheet	25,202	1,317
Gross Amounts of Recognized (Liabilities)	(2,107)	(7,972)
Gross Amounts Offset in the Balance Sheet	2,107	3,883
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(4,089)
Commodity \| Swaptions \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,896
Gross Amounts Offset in the Balance Sheet	(1,382)
Net Amounts of Assets Presented in the Balance Sheet	1,514
Gross Amounts of Recognized (Liabilities)	(1,382)
Gross Amounts Offset in the Balance Sheet	1,382
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,695	6,468
Gross Amounts Offset in the Balance Sheet	(2,108)	(2,822)
Net Amounts of Assets Presented in the Balance Sheet	4,587	3,646
Gross Amounts of Recognized (Liabilities)	(2,075)	(1,702)
Gross Amounts Offset in the Balance Sheet	2,108	2,822
Net Amounts of (Liabilities) Presented in the Balance Sheet	33	1,120
Commodity \| Calls \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(224)
Net Amounts of Assets Presented in the Balance Sheet	(224)
Gross Amounts of Recognized (Liabilities)	(224)
Gross Amounts Offset in the Balance Sheet	224
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	17,816	8,984
Gross Amounts Offset in the Balance Sheet	(17,816)	(8,868)
Net Amounts of Assets Presented in the Balance Sheet	0	116
Gross Amounts of Recognized (Liabilities)	(21,105)	(8,868)
Gross Amounts Offset in the Balance Sheet	17,816	8,868
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,289)	0
Commodity \| Collars \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	869	5,945
Gross Amounts Offset in the Balance Sheet	0	(707)
Net Amounts of Assets Presented in the Balance Sheet	869	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
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		8,538
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,439	0
Gross Amounts Offset in the Balance Sheet	(1,439)	(561)
Net Amounts of Assets Presented in the Balance Sheet	0	(561)
Gross Amounts of Recognized (Liabilities)	0	(561)
Gross Amounts Offset in the Balance Sheet	1,439	561
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ 1,439	$ 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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