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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Vessels and equipment | $ 437 | $ 437 |  |
Tax losses carried forward | 36,219 | 115,564 |  |
Other | 6,150 | 7,166 |  |
Total deferred tax assets | 42,806 | 123,167 |  |
Deferred tax liabilities: |  |  |  |
Other | 47 | 76 |  |
Total deferred tax liabilities | 130 | 195 |  |
Net Deferred Tax Assets Before Deducting Valuation Allowance | 42,676 | 122,972 |  |
Valuation allowance | (38,572) | (120,810) |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Freight tax provisions (note 18) | 41,404 | 47,813 | $ 42,477 | $ 46,956
Net Deferred Tax Assets Before Deducting Valuation Allowance | 42,676 | 122,972 |  |
Net deferred tax assets | 4,104 | 2,162 |  |
Deferred Tax Liabilities, Property, Plant and Equipment | 83 | 32 |  |
deferred tax liability, Provisions | 0 | $ 87 |  |
Norway |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax losses and disallowed finance costs | $ 11,600 |  |  |

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