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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