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Significant Accounting Policies - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted cash $ 15,000 $ 10,500  
Allowance for doubtful accounts $ 84 $ 54  
Scrap value per light weight ton (LWT) $0.2    
Vessels useful life 25 years    
CMTC
     
Major customer percentage 32.00% 45.00% 24.00%
British Petroleum Shipping Limited ("BP")
     
Major customer percentage 17.00% 23.00% 32.00%
Overseas Shipholding Group Inc ("OSG")
     
Major customer percentage     11.00%
A.P. Moler-Maersk A.S. ("Maersk")
     
Major customer percentage 14.00%    
Hyundai Merchant Marine Co Ltd ("HMM")
     
Major customer percentage 13.00%