Long-Term Debt (Details 4) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Nov. 05, 2014
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Aug. 31, 2010
Dec. 31, 2014
Dec. 31, 2013
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Dec. 31, 2012
Dec. 31, 2010
Jan. 31, 2011
Oct. 22, 2014
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Jan. 24, 2011
Dec. 31, 2008
Feb. 21, 2011
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Long-Term Debt                      
Arrangement fee (as a percent)   2.00%                  
Arrangement fee paid   $ 8,500,000       $ 3,300,000          
Number of Vessels Sold       7              
Gross sale consideration     50,602,000 52,926,000 5,635,000            
payments made to acquire vessels     37,000,000                
Number Of Vessels Acquired 2                    
Lenders fees paid for utilizing sale proceeds     90,000                
Remaining borrowing availability     0                
January 2011 Credit Facility                      
Long-Term Debt                      
Amount outstanding as of the balance sheet date     341,300,000                
Variable rate basis       LIBOR              
Interest rate margin (as a percent)     1.85%                
Interest rate margin if aggregate outstanding indebtedness exceeds $276 million (as a percent)     2.50%                
Minimum aggregate outstanding indebtedness under credit facility for interest rate margin to be 2.50%     276,000,000                
Interest rate margin if aggregate outstanding indebtedness exceeds $326 million (as a percent)     3.00%                
Minimum aggregate outstanding indebtedness under credit facility for interest rate margin to be 3.00%     326,000,000                
Interest rate margin if aggregate outstanding indebtedness exceeds $376 million (as a percent)     3.50%                
Minimum aggregate outstanding indebtedness under credit facility for interest rate margin to be 3.50%     376,000,000                
Arrangement fee paid             5,200,000        
Commitment fee payable (as a percent)     0.75%                
Hyundai Samho vendor financing                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility     190,000,000                
Amount outstanding as of the balance sheet date       64,400,000              
Number of newbuilding containerships financed     8                
Fixed interest rate (as a percent)     8.00%                
Number of consecutive semi-annual installments in case of three newbuilding vessels     6                
Number of newbuilding vessels for which principal is to be repaid in six consecutive semi-annual installments     3                
Period of commencement of repayment of principal, in case of three newbuilding vessels     1 year 6 months                
Number of consecutive semi-annual installments in case of five newbuilding vessels     7                
Period of commencement of repayment of principal, in case of five newbuilding vessels     1 year                
Number of newbuilding vessels for which principal is to be repaid in seven consecutive semi-annual installments     5                
Aegean Baltic Bank HSH Nordbank Piraeus Bank                      
Long-Term Debt                      
Number of Vessels Sold               5      
Gross sale consideration     55,200,000                
Commission paid on sale of mortgaged vessels     18,200,000                
Aegean Baltic Bank HSH Nordbank Piraeus Bank | January 2011 Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                 123,800,000    
Amount outstanding as of the balance sheet date     94,800,000           23,750,000    
The Royal Bank of Scotland | January 2011 Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                 100,000,000    
Amount outstanding as of the balance sheet date     85,000,000                
ABN Amro-Lloyds TSB-National Bank of Greece                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                   253,200,000  
ABN Amro-Lloyds TSB-National Bank of Greece | January 2011 Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                 37,100,000    
Club Facility | January 2011 Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                 83,900,000    
Amount outstanding as of the balance sheet date     65,400,000                
Citibank and Eurobank | January 2011 Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                 80,000,000    
Amount outstanding as of the balance sheet date     69,700,000                
Sinosure CEXIM-Citi-ABN Amro Credit Facility                      
Long-Term Debt                      
Maximum borrowing capacity under credit facility                     203,400,000
Amount outstanding as of the balance sheet date     142,400,000                
Variable rate basis       LIBOR              
Interest rate margin (as a percent)     2.85%                
Number of tranches which comprise the credit facility                     3
Amount of each tranche equal to a percentage of contract price for newbuilding vessels securing such tranche                     60.00%
Period of repayment of principal in semi-annual installments       10 years              
Remaining borrowing availability     0                
Ratio of market value of vessels collateralizing the credit facilities, to aggregate debt outstanding (as a percent)     125.00%                
Consolidated net leverage ratio to pay cash dividends or repurchase shares     6                
Sinosure CEXIM-Citi-ABN Amro Credit Facility | Maximum                      
Long-Term Debt                      
Amount of each tranche, which comprises the credit facility, option one                     67,800,000
Sinosure CEXIM-Citi-ABN Amro Credit Facility | January 2011 Credit Facility                      
Long-Term Debt                      
Amount outstanding as of the balance sheet date     $ 142,400,000