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Income Tax - Components of Partnership's Deferred Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Components Of Deferred Tax Assets And Liabilities [Line Items] |  |
Derivative instruments | $ 50,669 | $ 59,724
Taxation loss carryforwards | 40,762 | 35,554
Vessels and equipment | 3,150 | 2,178
Capitalized interest | (2,784) | (3,123)
Gross deferred tax assets | 91,797 | 94,333
Valuation allowance | (85,884) | (89,236)
Net deferred tax assets | $ 5,913 | $ 5,097

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