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Summary of Significant Accounting Policies - Vessels and equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Vessels and equipment |  |  |
Depreciation, Depletion and Amortization | $ 93,582 | $ 97,551 | $ 99,033
Oil Tanker |  |  |
Vessels and equipment |  |  |
Property, plant and equipment, useful life | 25 years |  |
Excluding amortization of Drydocking expenditure |  |  |
Vessels and equipment |  |  |
Depreciation, Depletion and Amortization | $ 70,000 | $ 71,900 | $ 71,900
Dry-docking activity |  |  |
Vessels and equipment |  |  |
Property, Plant and Equipment, Estimated Useful Lives | Useful Life, Lease Term [Member] |  |

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Indicates description of term of useful life for property, plant, and equipment when not stated as numeric value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482190/360-10-35-3 + Details
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