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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 | Dec. 31, 2013 Shuttle tankers [Member] Vessel | Dec. 31, 2013 Service Life [Member] Shuttle tankers [Member] Vessel | Dec. 31, 2013 Original useful life [Member] Older shuttle tankers [Member] | Dec. 31, 2013 Reduced useful life [Member] Older shuttle tankers [Member]
Change in Accounting Estimate [Line Items] |  |  |  |  |
Estimated useful life |  |  |  | 25 years | 20 years
Number of vessels |  | 6 | 6 |  |
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 |  |  |  |

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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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