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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

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