Property, Plant and Equipment - Narrative (Details)		1 Months Ended	3 Months Ended					12 Months Ended
	Jul. 01, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) foot	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) foot well	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 25, 2026 foot	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Amount			$ 191,821,000			$ 72,055,000		$ 191,821,000	$ 72,055,000	$ 49,118,000		$ 171,860,000
Additions pending the determination of proved reserves								119,766,000	49,408,000	48,000
Reclassifications to proved properties based on the determination of proved reserves								0	0	(82,185,000)
Capitalized exploration well costs charged to expense								0	(26,471,000)	(40,605,000)
Well costs incurred and expensed								30,100,000	46,700,000	129,200,000
Exploratory well costs capitalized more than one year			163,400,000					163,400,000
Impairment of assets						$ 28,400,000	$ 34,500,000	115,002,000	62,909,000	0
Discontinued Operations, Disposed of by Sale | Brunei CA-2
Property, Plant and Equipment [Line Items]
Cash received from divestiture			$ 12,500,000					$ 12,500,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]			Gain on sale of assets and other operating income
Gain (loss) on sale of assets			$ 4,000,000.0
Gain on write-down			$ 6,000,000.0
Discontinued Operations, Disposed of by Sale | Ralph And Saylee Area Of Tilden West
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets		$ 0
Consideration adjustment sale price		$ 8,200,000		$ 8,200,000
BW Pioneer Floating Production Storage And Offloading Vessel (FPSO)
Property, Plant and Equipment [Line Items]
Consideration transferred					$ 125,000,000.0
Block CI-502
Property, Plant and Equipment [Line Items]
Number of exploration wells | well								2
Well costs incurred and expensed								$ 30,000,000.0
Mississippi Canyon 216
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed									27,600,000
Mississippi Canyon 387
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed									13,400,000
Walker Ridge 425
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed										82,000,000.0
Atwater Valley 138
Property, Plant and Equipment [Line Items]
Well costs incurred and expensed										$ 47,200,000
Subsequent Event | Banjo
Property, Plant and Equipment [Line Items]
Net payable area | foot											50
Subsequent Event | Cello
Property, Plant and Equipment [Line Items]
Net payable area | foot											30
Vietnam
Property, Plant and Equipment [Line Items]
Net oil pay, feet | foot			106					106
Exploratory well costs capitalized more than one year			$ 91,500,000					$ 91,500,000
Gulf of America
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			64,600,000					64,600,000
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	$ 23,000,000.0
United States Offshore
Property, Plant and Equipment [Line Items]
Impairment of assets								$ 115,002,000	$ 62,909,000
Impairment of assets excluding NCI				$ 92,000,000.0