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Derivative Instruments - Fair Value Amounts of Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Accounts receivable	$ 4,567	$ 4,344
Current portion of derivative assets	17,212	15,608
Derivative assets	145,347	139,651
Accrued liabilities	(10,887)	(11,448)
Current portion of derivative liabilities	(48,046)	(43,973)
Derivative liabilities	(248,249)	(249,245)
Interest rate swap agreements [Member]
Derivatives, Fair Value [Line Items]
Accounts receivable	4,513	4,344
Current portion of derivative assets	16,927	15,608
Derivative assets	144,247	139,651
Accrued liabilities	(10,887)	(11,448)
Current portion of derivative liabilities	(48,046)	(43,973)
Derivative liabilities	(245,287)	(248,645)
Currency swap [Member]
Derivatives, Fair Value [Line Items]
Accounts receivable	54
Current portion of derivative assets	285
Derivative assets
Accrued liabilities
Current portion of derivative liabilities
Derivative liabilities	(2,962)
Toledo Spirit time-charter derivative [Member]
Derivatives, Fair Value [Line Items]
Accounts receivable
Current portion of derivative assets
Derivative assets	1,100
Accrued liabilities
Current portion of derivative liabilities
Derivative liabilities		$ (600)

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

+ References

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-Number 210

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- Definition

Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

+ References

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-Name Accounting Standards Codification

-Topic 210

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- Definition

Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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-Paragraph 10A, 10B

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Carrying amounts due as of the balance sheet date of the sum of amounts receivable other than from customers.

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