Derivative Activities - Combined Fair Value of Derivatives, by Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 247,236	$ 126,464
Gross Amounts Offset in the Balance Sheet	(30,216)	(84,549)
Net Amounts of Assets Presented in the Balance Sheet	217,020	41,915
Gross Amounts of Recognized (Liabilities)	(30,633)	(251,461)
Gross Amounts Offset in the Balance Sheet	30,216	84,549
Net Amounts of (Liabilities) Presented in the Balance Sheet	(417)	(166,912)
Contingent Consideration
Derivative [Line Items]
Gross Amounts of Recognized Assets	7,350	13,080
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	7,350	13,080
Commodity \| Natural Gas \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	110,242	19,438
Gross Amounts Offset in the Balance Sheet	(2,726)	(6,236)
Net Amounts of Assets Presented in the Balance Sheet	107,516	13,202
Gross Amounts of Recognized (Liabilities)	(2,726)	(115,374)
Gross Amounts Offset in the Balance Sheet	2,726	6,236
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(109,138)
Commodity \| Natural Gas \| Swaptions
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(2,435)
Net Amounts of Assets Presented in the Balance Sheet	(2,435)
Gross Amounts of Recognized (Liabilities)	(2,435)
Gross Amounts Offset in the Balance Sheet	2,435
Net Amounts of (Liabilities) Presented in the Balance Sheet	0
Commodity \| Natural Gas \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	90,325	54,222
Gross Amounts Offset in the Balance Sheet	(2,536)	(45,452)
Net Amounts of Assets Presented in the Balance Sheet	87,789	8,770
Gross Amounts of Recognized (Liabilities)	(2,536)	(72,866)
Gross Amounts Offset in the Balance Sheet	2,536	45,452
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(27,414)
Commodity \| Natural Gas \| Three Way Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,430	12,424
Gross Amounts Offset in the Balance Sheet	(640)	(12,424)
Net Amounts of Assets Presented in the Balance Sheet	7,790	0
Gross Amounts of Recognized (Liabilities)	(640)	(24,341)
Gross Amounts Offset in the Balance Sheet	640	12,424
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(11,917)
Commodity \| Natural Gas \| Basis Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	30,020	25,493
Gross Amounts Offset in the Balance Sheet	(12,459)	(20,437)
Net Amounts of Assets Presented in the Balance Sheet	17,561	5,056
Gross Amounts of Recognized (Liabilities)	(12,876)	(24,972)
Gross Amounts Offset in the Balance Sheet	12,459	20,437
Net Amounts of (Liabilities) Presented in the Balance Sheet	(417)	(4,535)
Commodity \| Crude Oil \| Swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets	354
Gross Amounts Offset in the Balance Sheet	(9,420)
Net Amounts of Assets Presented in the Balance Sheet	(9,066)
Gross Amounts of Recognized (Liabilities)	(9,420)	(13,908)
Gross Amounts Offset in the Balance Sheet	9,420	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(13,908)
Commodity \| Crude Oil \| Collars
Derivative [Line Items]
Gross Amounts of Recognized Assets	515	1,807
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	$ 515	$ 1,807

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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