Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 152,692	$ 122,624
Gross Amounts Offset in the Balance Sheet	(15,138)	(29,829)
Net Amounts of Assets Presented in the Balance Sheet	137,554	92,795
Gross Amounts of Recognized (Liabilities)	(29,206)	(37,435)
Gross Amounts Offset in the Balance Sheet	15,138	29,829
Net Amounts of (Liabilities) Presented in the Balance Sheet	(14,068)	(7,606)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	134,364	20,834
Gross Amounts Offset in the Balance Sheet	(2,913)	(11,748)
Net Amounts of Assets Presented in the Balance Sheet	131,451	9,086
Gross Amounts of Recognized (Liabilities)	(1,657)	(18,332)
Gross Amounts Offset in the Balance Sheet	2,913	11,748
Net Amounts of (Liabilities) Presented in the Balance Sheet	1,256	(6,584)
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,893	26,481
Gross Amounts Offset in the Balance Sheet	(4,794)	(651)
Net Amounts of Assets Presented in the Balance Sheet	(901)	25,830
Gross Amounts of Recognized (Liabilities)	(4,814)	0
Gross Amounts Offset in the Balance Sheet	4,794	651
Net Amounts of (Liabilities) Presented in the Balance Sheet	(20)	651
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		18,719
Gross Amounts Offset in the Balance Sheet		(589)
Net Amounts of Assets Presented in the Balance Sheet		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 (C4- Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	167	4,084
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	167	4,084
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	60	17,371
Gross Amounts Offset in the Balance Sheet	(127)	0
Net Amounts of Assets Presented in the Balance Sheet	(67)	17,371
Gross Amounts of Recognized (Liabilities)	(127)
Gross Amounts Offset in the Balance Sheet	127
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	0	5,200
Gross Amounts Offset in the Balance Sheet	(1,325)	(3,883)
Net Amounts of Assets Presented in the Balance Sheet	(1,325)	1,317
Gross Amounts of Recognized (Liabilities)	(2,594)	(7,972)
Gross Amounts Offset in the Balance Sheet	1,325	3,883
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,269)	(4,089)
Commodity \| Swaptions \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(1,597)
Net Amounts of Assets Presented in the Balance Sheet	(1,597)
Gross Amounts of Recognized (Liabilities)	(2,254)
Gross Amounts Offset in the Balance Sheet	1,597
Net Amounts of (Liabilities) Presented in the Balance Sheet	(657)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	10,766	6,468
Gross Amounts Offset in the Balance Sheet	(1,092)	(2,822)
Net Amounts of Assets Presented in the Balance Sheet	9,674	3,646
Gross Amounts of Recognized (Liabilities)	(1,371)	(1,702)
Gross Amounts Offset in the Balance Sheet	1,092	2,822
Net Amounts of (Liabilities) Presented in the Balance Sheet	(279)	1,120
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,913	8,984
Gross Amounts Offset in the Balance Sheet	(1,913)	(8,868)
Net Amounts of Assets Presented in the Balance Sheet	0	116
Gross Amounts of Recognized (Liabilities)	(16,040)	(8,868)
Gross Amounts Offset in the Balance Sheet	1,913	8,868
Net Amounts of (Liabilities) Presented in the Balance Sheet	(14,127)	0
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
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		8,538
Commodity \| Calls \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(349)
Net Amounts of Assets Presented in the Balance Sheet	(349)
Gross Amounts of Recognized (Liabilities)	(349)
Gross Amounts Offset in the Balance Sheet	349
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,529	0
Gross Amounts Offset in the Balance Sheet	(1,028)	(561)
Net Amounts of Assets Presented in the Balance Sheet	501	(561)
Gross Amounts of Recognized (Liabilities)	0	(561)
Gross Amounts Offset in the Balance Sheet	1,028	561
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ 1,028	$ 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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