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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 |  |

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- Definition Amount of addition to capitalized exploratory well cost pending determination of proved reserve in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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- Definition Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B + Details
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