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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 |  |  |  |  |  |  |

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