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Significant Accounting Policies - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted cash 10,500 6,750  
Allowance for doubtful accounts 54    
Scrap value per light weight ton (LWT) $0.2    
Vessels useful life 25 years 0 months 0 days    
CMTC
     
Major customer revenue percentage 45.00% 24.00%  
British Petroleum Shipping Limited
     
Major customer revenue percentage 23.00% 32.00% 49.00%
OSG
     
Major customer revenue percentage   11.00% 11.00%
Morgan Stanley Capital Group Inc
     
Major customer revenue percentage     11.00%