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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Vessels and equipment $ 5,377 $ 40,928
Tax losses carried forward 193,501 276,291
Other 29,355 17,075
Total deferred tax assets 228,233 334,294
Deferred tax liabilities:    
Vessels and equipment 9,053 5,974
Provisions 5,153 0
Other 8,417 13,317
Total deferred tax liabilities 22,623 19,291
Net deferred tax assets 205,610 315,003
Valuation allowance (202,513) (290,015)
Net deferred tax assets $ 3,097 $ 24,988