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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
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