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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Vessels and equipment | $ 21,837 | $ 15,653 |  |
Tax losses carried forward | 98,558 | 96,008 |  |
Other | 5,094 | 4,084 |  |
Total deferred tax assets | 125,489 | 115,745 |  |
Deferred tax liabilities: |  |  |  |
Other | 407 | 6,054 |  |
Total deferred tax liabilities | 776 | 6,054 |  |
Net Deferred Tax Assets Before Deducting Valuation Allowance | 124,713 | 109,691 |  |
Valuation allowance | (123,461) | (106,949) |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Freight tax provisions (note 21) | 42,477 | 46,956 | $ 51,562 | $ 53,665
Net Deferred Tax Assets Before Deducting Valuation Allowance | 124,713 | 109,691 |  |
Net deferred tax assets | $ 1,252 | $ 2,742 |  |
Settlement with Taxing Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Freight tax provisions (note 21) |  |  | $ 8,800 |

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