|
Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
|
Conventional oil tankers [Member]
|
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| Partnership Organization And Basis Of Presentation [Line Items] | ||||
| Number of vessels acquired | 13 | |||
|
Management activities [Member]
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| Partnership Organization And Basis Of Presentation [Line Items] | ||||
| Amount reclassified from general and administrative to vessel operating expenses | $ 1.4 | $ 2.1 | $ 2.9 | $ 4.2 |