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Change in Accounting Estimate - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Change in Accounting Estimate [Line Items] |
Increase in depreciation and amortization expenses | $ 14.9
Decrease in net income attributable to partners | $ 4.4
Decrease in net income attributable to partners, per share amount | $ 0.06
Older shuttle tankers [Member] |
Change in Accounting Estimate [Line Items] |
Number of shuttle tankers impacted by reduced useful lives | 6
Original useful life [Member] | Older shuttle tankers [Member] |
Change in Accounting Estimate [Line Items] |
Estimated useful life | 25 years
Reduced useful life [Member] | Older shuttle tankers [Member] |
Change in Accounting Estimate [Line Items] |
Estimated useful life | 20 years

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- Definition Change In Accounting Estimate Effect On Basic Earnings Per Share + References No definition available. + Details
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- Definition Change In Accounting Estimate Effect On Net Income + References No definition available. + Details
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- Definition Number Of Tangible Asset Estimated Useful Life Reduced + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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