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Subsequent Events - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Apr. 08, 2013
Construction in Progress [Member]
Vessel
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Apr. 30, 2014
Commercial Management Fee [Member]
Vessel
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Apr. 30, 2014
Technical management fee [Member]
Vessel
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Apr. 30, 2014
Conventional Tanker Commercial Operations [Member]
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Apr. 30, 2014
Technical Management Operations [Member]
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Mar. 31, 2014
Subsequent Events [Member]
Vessel
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Jan. 23, 2014
Subsequent Events [Member]
Tanker Investments Limited [Member]
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Mar. 31, 2014
Subsequent Events [Member]
Tanker Investments Limited [Member]
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Jan. 23, 2014
Subsequent Events [Member]
Series A-2 [Member]
Tanker Investments Limited [Member]
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Apr. 30, 2014
Subsequent Events [Member]
Class B [Member]
Tanker Investments Limited [Member]
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Jan. 23, 2014
Subsequent Events [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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Feb. 28, 2014
Subsequent Events [Member]
Contract Termination [Member]
Construction in Progress [Member]
Vessel
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Jan. 31, 2014
Subsequent Events [Member]
Tranche One [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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Jan. 31, 2014
Subsequent Events [Member]
Tranche Two [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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Jan. 31, 2014
Subsequent Events [Member]
Tranche Three [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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Jan. 31, 2014
Subsequent Events [Member]
Tranche Four [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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Jan. 23, 2014
Subsequent Events [Member]
Maximum [Member]
Warrant [Member]
Tanker Investments Limited [Member]
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| Subsequent Event [Line Items] | |||||||||||||||||||||
| Purchase of common stock | 2,500,000 | 750,000 | |||||||||||||||||||
| Equity method investment, ownership interest | 50.00% | 10.00% | |||||||||||||||||||
| Issuance of equity private placement | $ 250,000,000 | ||||||||||||||||||||
| Equity method investment | 25,000,000 | ||||||||||||||||||||
| Fixed price of stock purchase warrants, per share | $ 10 | ||||||||||||||||||||
| Fair market value of the shares | $ 12.50 | $ 15.00 | $ 17.50 | $ 20.00 | |||||||||||||||||
| Consecutive trading days | 10 days | ||||||||||||||||||||
| Series A-2 Preferred Share received | 0 | 0 | 1 | ||||||||||||||||||
| Preferred stock, voting rights received | Entitles the holder to elect one board member | ||||||||||||||||||||
| Percentage of combined ownership interest | 6.51% | ||||||||||||||||||||
| Purchase price consideration | $ 0 | $ 9,509,000 | $ 0 | $ 15,600,000 | |||||||||||||||||
| Number of vessels | 4 | 82 | 42 | 2,000,000 | 8 | ||||||||||||||||
| Percentage of ownership acquired | 50.00% | 10000.00% | |||||||||||||||||||
| Commercially managed tanker pools | 3 | ||||||||||||||||||||