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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Vessels and equipment | $ 58,825 | $ 76,582
Tax losses carried forward | 427,443 | 380,299
Other | 64,194 | 95,312
Total deferred tax assets | 550,462 | 552,193
Deferred tax liabilities: |  |
Vessels and equipment | 26,503 | 60,776
Long-term debt | 33,764 | 24,918
Other | 40,117 | 45,624
Total deferred tax liabilities | 100,384 | 131,318
Net deferred tax assets | 450,078 | 420,875
Valuation allowance | (421,343) | (398,559)
Net deferred tax assets | $ 28,735 | $ 22,316

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