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Long-term Debt - Information Per Loan 1 (Details)
 4 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended 24 Months Ended
Apr. 30, 2013
USD ($)
Jul. 01, 2013
USD ($)
Jul. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2014
USD ($)
Mar. 30, 2015
USD ($)
Jul. 17, 2013
USD ($)
Dec. 31, 2012
USD ($)
Long-term debt [Line Items]                      
Cash and cash equivalents       $ 208,056,000 $ 86,000,000 $ 53,548,000   $ 86,000,000     $ 21,700,000
Restricted cash       $ 3,769,000 $ 3,352,000     3,352,000      
Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Initiation date       Dec. 27, 2007              
Maximum borrowing capacity       $ 120,000,000              
Vessels provided as collateral       The Commerzbank $120,000 Facility is secured by a first priority mortgage over the Star Gamma, Star Delta, Star Epsilon, Star Zeta and Star Theta vessels              
Number of loan tranches       2              
Commerzbank $26000 Facility                      
Long-term debt [Line Items]                      
Initiation date       Sep. 03, 2010              
Maximum borrowing capacity       $ 26,000,000              
Vessels provided as collateral       The Commerzbank $26,000 Facility is secured by a first priority mortgage over the Star Aurora vessel              
Commerzbank $120,000 and $26,000 facilities - Supplemental Agreement                      
Long-term debt [Line Items]                      
Waiver fee percentage   0.40%                  
Prepayment amount   $ 2,000,000                  
Amount of equity to be raised under debt instrument covenants   $ 30,000,000                  
Percent of quarterly installments deferred         50.00% 60.00%          
Commerzbank $120,000 and $26,000 facilities - Second Supplemental Agreement                      
Long-term debt [Line Items]                      
Prepayment amount                 $ 3,000,000    
Credit Agricole Corporate and Investment Bank $70,000 facility                      
Long-term debt [Line Items]                      
Initiation date       Jan. 20, 2011              
Amount drawn down             $ 67,275,000        
Maximum borrowing capacity       $ 70,000,000              
Number of installments       28              
Frequency of payments       quarterly              
Vessels provided as collateral       The Credit Agricole $70,000 Facility is secured by a first priority mortgage over the Star Borealis and Star Polaris vessels              
Number of loan tranches       2              
Number of vessels financed       2              
ABN Amro Bank N.V. $31,000 facility                      
Long-term debt [Line Items]                      
Initiation date       Jul. 21, 2011              
Maximum borrowing capacity       $ 31,000,000              
Vessels provided as collateral       The ABN AMRO $31,000 Facility is secured by a first priority mortgage over the Star Big and Star Mega vessels              
Number of vessels financed       2              
Amount of equity to be raised under debt instrument covenants     $ 30,000,000                
Interest rate, Margin increase     0.50%                
HSH Nordbank AG $64,500 facility                      
Long-term debt [Line Items]                      
Initiation date       Oct. 03, 2011              
Maximum borrowing capacity       $ 64,500,000              
Number of loan tranches       2              
HSH Nordbank AG $64,500 facility, Supplemental Agreement                      
Long-term debt [Line Items]                      
Prepayment amount                   $ 6,590,000  
Amount of equity to be raised under debt instrument covenants                   $ 20,000,000  
Periodic payments, amount deferred               $ 3,500,000      
HSH Nordbank AG $35,000 facility                      
Long-term debt [Line Items]                      
Initiation date       Feb. 06, 2014              
Maximum borrowing capacity       $ 35,000              
Expiration date       Feb. 28, 2021              
Number of installments       28              
Frequency of payments       quarterly              
Vessels provided as collateral       The HSH Nordbank $35,000 Facility is secured by a first priority mortgage over the Star Challenger and Star Fighter vessels              
Number of vessels financed       2              
Deutsche Bank AG $39,000 facility                      
Long-term debt [Line Items]                      
Initiation date       Mar. 14, 2014              
Maximum borrowing capacity       $ 39,000,000              
Expiration date       Mar. 31, 2021              
Vessels provided as collateral       The Deutsche Bank $39,000 Facility is secured by a first priority mortgage over the Star Sirius and Star Vega vessels              
Number of loan tranches       2              
Number of vessels financed       2              
Tranche A | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 50,000,000              
Date of first required payment       Jan. 31, 2010              
Number of installments       28              
Frequency of payments       quarterly              
Balloon installment       $ 13,700,000              
Tranche A | Credit Agricole Corporate and Investment Bank $70,000 facility                      
Long-term debt [Line Items]                      
Expiration date       Aug. 31, 2018              
Repayment installment       $ 485,400              
Balloon installment       19,558,200              
Tranche A | HSH Nordbank AG $64,500 facility                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 48,500,000              
Date of first required payment       Jan. 31, 2012              
Expiration date       Sep. 30, 2016              
Number of installments       20              
Frequency of payments       quarterly              
Repayment installment       $ 1,250,000              
Balloon installment       $ 23,500,000              
Tranche A | HSH Nordbank AG $64,500 facility, Supplemental Agreement                      
Long-term debt [Line Items]                      
Date of first required payment       Apr. 30, 2013              
Number of installments       7              
Frequency of payments       quarterly              
Repayment installment $ 813,000     $ 224,000              
Tranche A | HSH Nordbank AG $35,000 facility                      
Long-term debt [Line Items]                      
Date of first required payment       May 31, 2014              
Repayment installment       $ 312,500              
Balloon installment       8,750,000              
Tranche A | Deutsche Bank AG $39,000 facility                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 19,500,000              
Date of first required payment       Jun. 30, 2014              
Number of installments       28              
Frequency of payments       quarterly              
Repayment installment       $ 390,000              
Balloon installment       8,580,000              
Tranche B | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 70,000,000              
Date of first required payment       Jan. 31, 2010              
Number of installments       28              
Frequency of payments       quarterly              
Balloon installment       $ 12,000,000              
Tranche B | Credit Agricole Corporate and Investment Bank $70,000 facility                      
Long-term debt [Line Items]                      
Expiration date       Nov. 30, 2018              
Repayment installment       $ 499,700              
Balloon installment       20,134,000              
Tranche B | HSH Nordbank AG $64,500 facility                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 16,000,000              
Date of first required payment       Jan. 31, 2012              
Expiration date       Sep. 30, 2014              
Number of installments       12              
Frequency of payments       quarterly              
Repayment installment       $ 1,333,000              
Tranche B | HSH Nordbank AG $35,000 facility                      
Long-term debt [Line Items]                      
Date of first required payment       May 31, 2014              
Repayment installment       $ 291,700              
Balloon installment       9,332,400              
Tranche B | Deutsche Bank AG $39,000 facility                      
Long-term debt [Line Items]                      
Maximum borrowing capacity       $ 19,500,000              
Date of first required payment       Jun. 30, 2014              
Number of installments       28              
Frequency of payments       quarterly              
Repayment installment       $ 390,000              
Balloon installment       $ 8,580,000              
Tranche A - First four installments | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Number of installments       4              
Repayment installment       $ 2,250,000              
Tranche A - 5th Installment to 17th | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Number of installments       13              
Repayment installment       $ 1,000,000              
Tranche A - Last eleven installments | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Number of installments       11              
Repayment installment       $ 1,300,000              
Tranche B - First four installments | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Number of installments       4              
Repayment installment       $ 4,000,000              
Tranche B - Last twenty four installments | Commerzbank $120,000 Facilitiy                      
Long-term debt [Line Items]                      
Number of installments       24              
Repayment installment       $ 1,750,000