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Related Party Transactions - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified |
1 Months Ended | 1 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2012
Class A [Member]
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Jun. 30, 2013
Pool Managers [Member]
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Dec. 31, 2012
Pool Managers [Member]
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Jun. 30, 2012
Dropdown Predecessor [Member]
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Jun. 26, 2012
Dropdown Predecessor [Member]
Vessel
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Jun. 15, 2012
Dropdown Predecessor [Member]
Vessel
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Jun. 30, 2012
Conventional oil tankers [Member]
Tanker
|
Jun. 30, 2012
Product tankers [Member]
Tanker
|
Jun. 30, 2013
Asset Management [Member]
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Dec. 31, 2012
Asset Management [Member]
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| Related Party Transaction [Line Items] | ||||||||||||
| Reimbursement of Manager's crewing and manning costs | $ 4,100,000 | $ 4,900,000 | ||||||||||
| Working capital advanced to Pool Managers | 20,981,000 | 24,787,000 | 19,700,000 | 16,600,000 | ||||||||
| Number of Tankers | 3 | 10 | 7 | 6 | ||||||||
| Aggregate purchase price | 454,200,000 | |||||||||||
| Business acquisition outstanding debt | 428,100,000 | |||||||||||
| Business acquisition, number of shares issued | 4.5 | |||||||||||
| Business acquisition, cash paid | $ 1,100,000 | |||||||||||