Property, Plant and Equipment - Narrative (Details)		3 Months Ended			9 Months Ended
	Jul. 01, 2025 USD ($)	Sep. 30, 2025 USD ($) foot	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) foot	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Well costs		$ 115,146,000		$ 51,099,000	$ 115,146,000	$ 51,099,000	$ 72,055,000	$ 49,118,000
Additions pending the determination of proved reserves					43,091,000	28,452,000
Capitalized exploratory well costs charged to expense					0	26,471,000
Well costs incurred and expensed						43,000,000.0
Exploratory well costs capitalized more than one year		97,600,000			97,600,000
Impairment of assets		115,002,000		$ 0	115,002,000	34,528,000
Impairment of assets excluding NCI		$ 92,000,000			$ 92,000,000
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
Fair Value, Nonrecurring
Property, Plant and Equipment [Line Items]
Impairment of assets						$ 34,500,000
BW Pioneer Floating Production Storage And Offloading Vessel (FPSO)
Property, Plant and Equipment [Line Items]
Consideration transferred			$ 125,000,000
Initial payments to acquire productive assets			$ 100,000,000
Operations and maintenance services, term of contract			5 years
Vietnam
Property, Plant and Equipment [Line Items]
Net oil pay, feet | foot		106			106
Exploratory well costs capitalized more than one year		$ 68,200,000			$ 68,200,000
Gulf Of America
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year		22,100,000			22,100,000
CANADA
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year		4,600,000			4,600,000
Brunei
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year		$ 2,700,000			$ 2,700,000
Eagle Ford Shale
Property, Plant and Equipment [Line Items]
Payments to acquire additional working interests	$ 23,000,000