Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 80,043	$ 74,602
Gross Amounts Offset in the Balance Sheet	(26,380)	(34,590)
Net Amounts of Assets Presented in the Balance Sheet	53,663	40,012
Gross Amounts of Recognized (Liabilities)	(797,101)	(71,043)
Gross Amounts Offset in the Balance Sheet	26,380	34,590
Net Amounts of (Liabilities) Presented in the Balance Sheet	(770,721)	(36,453)
Contingent Consideration
Derivative [Line Items]
Gross Amounts of Recognized Assets	50,220	15,960
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	50,220	15,960
Commodity \| Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,574	33,559
Gross Amounts Offset in the Balance Sheet	(5,574)	(16,821)
Net Amounts of Assets Presented in the Balance Sheet	(0)	16,738
Gross Amounts of Recognized (Liabilities)	(359,243)	(10,120)
Gross Amounts Offset in the Balance Sheet	5,574	16,821
Net Amounts of (Liabilities) Presented in the Balance Sheet	(353,669)	6,701
Commodity \| Natural Gas \| Swaptions
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(60,132)	(9,803)
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(60,132)	(9,803)
Commodity \| Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	193	7,016
Gross Amounts Offset in the Balance Sheet	(193)	(2,329)
Net Amounts of Assets Presented in the Balance Sheet	0	4,687
Gross Amounts of Recognized (Liabilities)	(93,418)	0
Gross Amounts Offset in the Balance Sheet	193	2,329
Net Amounts of (Liabilities) Presented in the Balance Sheet	(93,225)	2,329
Commodity \| Natural Gas \| Three Way Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	2	535
Gross Amounts Offset in the Balance Sheet	(2)	(6,139)
Net Amounts of Assets Presented in the Balance Sheet	0	(5,604)
Gross Amounts of Recognized (Liabilities)	(200,479)	(18,353)
Gross Amounts Offset in the Balance Sheet	2	6,139
Net Amounts of (Liabilities) Presented in the Balance Sheet	(200,477)	(12,214)
Commodity \| Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,633	7,894
Gross Amounts Offset in the Balance Sheet	(12,187)	(3,502)
Net Amounts of Assets Presented in the Balance Sheet	3,446	4,392
Gross Amounts of Recognized (Liabilities)	7,160	(4,197)
Gross Amounts Offset in the Balance Sheet	12,187	3,502
Net Amounts of (Liabilities) Presented in the Balance Sheet	(5,027)	(695)
Commodity \| Natural Gas \| Calls
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	10,018
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	10,018
Commodity \| Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	10	2,465
Gross Amounts Offset in the Balance Sheet	(10)	(829)
Net Amounts of Assets Presented in the Balance Sheet	(0)	1,636
Gross Amounts of Recognized (Liabilities)	34,274	(5,471)
Gross Amounts Offset in the Balance Sheet	10	829
Net Amounts of (Liabilities) Presented in the Balance Sheet	34,264	(4,642)
Commodity \| NGLs (C3-Propane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(6,140)	(8,243)
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(6,140)	(8,243)
Commodity \| NGLs (C3-Propane) \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets		0
Gross Amounts Offset in the Balance Sheet		(107)
Net Amounts of Assets Presented in the Balance Sheet		(107)
Gross Amounts of Recognized (Liabilities)	(3,787)	(3,086)
Gross Amounts Offset in the Balance Sheet	0	107
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,787)	(2,979)
Commodity \| NGLs (C3-Propane) \| Spread Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,367	4,863
Gross Amounts Offset in the Balance Sheet	(8,367)	(4,863)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized (Liabilities)	(7,973)	(4,069)
Gross Amounts Offset in the Balance Sheet	8,367	4,863
Net Amounts of (Liabilities) Presented in the Balance Sheet	394	794
Commodity \| NGLs (NC4-Normal Butane) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(3,991)	(651)
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,991)	(651)
Commodity \| NGLs (NC4-Normal Butane) \| Collars
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(2,797)	(401)
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(2,797)	(401)
Commodity \| NGLs (C5-Natural Gasoline) \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	17
Gross Amounts Offset in the Balance Sheet	17
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	(3,908)	(4,897)
Gross Amounts Offset in the Balance Sheet	17	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,891)	(4,897)
Commodity \| NGLs (C5-Natural Gasoline) \| Collars
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(3,728)
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,728)
Commodity \| NGLs (C5-Natural Gasoline) \| Calls
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)		(546)
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of (Liabilities) Presented in the Balance Sheet		(546)
Freight \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	27	2,310
Gross Amounts Offset in the Balance Sheet	30	0
Net Amounts of Assets Presented in the Balance Sheet	(3)	2,310
Gross Amounts of Recognized (Liabilities)	(53)	(1,206)
Gross Amounts Offset in the Balance Sheet	30	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (23)	$ (1,206)

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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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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