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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Vessels and equipment $ 17,707 $ 1,646
Tax losses carried forward 167,179 164,009
Other 17,697 19,674
Total deferred tax assets 202,583 185,329
Deferred tax liabilities:    
Vessels and equipment 1,256 22,913
Provisions 0 6,512
Other 21,232 0
Total deferred tax liabilities 22,488 29,425
Net deferred tax assets 180,095 155,904
Valuation allowance (172,867) (153,302)
Net deferred tax assets $ 7,228 $ 2,602