Property, Plant and Equipment - Narrative (Details) $ in Millions			3 Months Ended		9 Months Ended
	Sep. 15, 2023 USD ($)	Sep. 15, 2023 CAD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Well costs			$ 51,099,000	$ 185,477,000	$ 51,099,000	$ 185,477,000	$ 49,118,000	$ 171,860,000
Additions pending the determination of proved reserves					28,452,000	40,825,000
Capitalized exploratory well costs charged to expense					26,471,000	26,143,000
Well costs incurred and expensed					43,000,000.0	81,700,000
Exploratory well costs capitalized more than one year			22,500,000		22,500,000
Impairment of oil and gas properties			0	$ 0	34,528,000	0
Vietnam
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			15,100,000		15,100,000
Canada
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			4,700,000		4,700,000
Proceeds from sales of property, plant and equipment		$ 139.0
Gain (loss) on sale of property plant equipment	$ 0
Brunei
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			$ 2,700,000		2,700,000
Mississippi Canyon 216
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed					25,800,000
Mississippi Canyon 387
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed					$ 11,800,000
Walker Ridge 425
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed						$ 80,300,000