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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 ($) | Apr. 29, 2013 USD ($) | Jul. 01, 2013 USD ($) | Aug. 06, 2013 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 20, 2013 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2014 USD ($) | Mar. 30, 2015 USD ($) | Jul. 17, 2013 USD ($)
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 Theta and Star Iris |  |  |  |  |  |  |
Number of loan tranches |  |  |  |  | 2 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 28 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jan. 31, 2010 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 13,700,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche A - First four installments |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 4 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 2,250,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche A - 5th Installment to 17th |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 13 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche A - Last eleven installments |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 11 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 28 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jan. 31, 2010 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche B - First four installments |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 4 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |
Commerzbank $120,000 Facilitiy | Tranche B - Last twenty four installments |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 24 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 1,750,000 |  |  |  |  |  |  |
Commerzbank $26,000 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 was 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] |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  | Oct. 31, 2018 |  |  |  |  |  |  |
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% |  |  |  |  |
Committed terms for refinancing, date |  |  |  |  | Jan. 08, 2018 |  |  |  |  |  |  |
Commerzbank $120,000 and $26,000 facilities - Second Supplemental Agreement |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Prepayment amount |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |
Credit Agricole $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 |  |  |  |  |  |  |
Credit Agricole $70,000 facility | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2018 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 485,400 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 19,558,200 |  |  |  |  |  |  |
Credit Agricole $70,000 facility | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  | Nov. 30, 2018 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 499,700 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 20,134,000 |  |  |  |  |  |  |
HSH Nordbank AG $64,500 facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  | Oct. 03, 2011 |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 64,500,000 |  |  |  |  |  |  |
Vessels provided as collateral |  |  |  |  | The HSH Nordbank AG $64,500 Facility is secured by a first priority mortgage over the Star Cosmo, Star Kappa, Star Zeta and Star Omicron vessels |  |  |  |  |  |  |
Number of loan tranches |  |  |  |  | 2 |  |  |  |  |  |  |
HSH Nordbank AG $64,500 facility | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 48,500,000 |  |  |  |  |  |  |
Expiration date |  |  |  |  | Sep. 30, 2016 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 20 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jan. 31, 2012 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 1,250,000 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | 23,500,000 |  |  |  |  |  |  |
HSH Nordbank AG $64,500 facility | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |
Expiration date |  |  |  |  | Sep. 30, 2014 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 12 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jan. 31, 2012 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 1,333,000 |  |  |  |  |  |  |
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 $64,500 facility, Supplemental Agreement | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of installments |  |  |  |  | 7 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Apr. 30, 2013 |  |  |  |  |  |  |
Repayment installment | $ 224,000 | $ 813,000 |  |  |  |  |  |  |  |  |  |
HSH Nordbank AG $64,500 Facility - Second Supplemental Agreement |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2018 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
HSH Nordbank AG $35,000 facility | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | May 31, 2014 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 312,500 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 8,750,000 |  |  |  |  |  |  |
HSH Nordbank AG $35,000 facility | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | May 31, 2014 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 291,700 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 9,332,400 |  |  |  |  |  |  |
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, Star Vega and Star Triumph vessels |  |  |  |  |  |  |
Number of loan tranches |  |  |  |  | 2 |  |  |  |  |  |  |
Number of vessels financed |  |  |  |  | 2 |  |  |  |  |  |  |
Deutsche Bank AG $39,000 facility | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 19,500,000 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 28 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jun. 30, 2014 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 390,000 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | 8,580,000 |  |  |  |  |  |  |
Deutsche Bank AG $39,000 facility | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 19,500,000 |  |  |  |  |  |  |
Number of installments |  |  |  |  | 28 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Date of first required payment |  |  |  |  | Jun. 30, 2014 |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 390,000 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 8,580,000 |  |  |  |  |  |  |
ABN $87,458 Facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Initiation date |  |  |  |  | Aug. 01, 2013 |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 34,458,000 |  |  |  |  |  |  |
Frequency of payments |  |  |  |  | quarterly |  |  |  |  |  |  |
Vessels provided as collateral |  |  |  |  | The ABN AMRO $87,458 Facility is secured by a first-priority ship mortgage over the Big Bang, Strange Attractor, Big Fish and Pantagruel vessels |  |  |  |  |  |  |
Number of loan tranches |  |  |  |  | 4 |  |  |  |  |  |  |
Committed terms for refinancing, date |  |  |  |  | Feb. 13, 2018 |  |  |  |  |  |  |
ABN $87,458 Facility | Tranche A |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 20,350,000 |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 20,350,000 |  |  |  |  |  |  |
Expiration date |  |  |  |  | Sep. 30, 2017 |  |  |  |  |  |  |
ABN $87,458 Facility | Tranche B |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 14,108,000 |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 14,108,000 |  |  |  |  |  |  |
Expiration date |  |  |  |  | Aug. 31, 2018 |  |  |  |  |  |  |
ABN $87,458 Facility | Tranche C |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  | $ 53,000,000 |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 53,000,000 |  |  |  |  |  |  |
Expiration date |  |  |  |  | Dec. 31, 2018 |  |  |  |  |  |  |
Minimum | ABN $87,458 Facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment installment |  |  |  |  | $ 248,000 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | 2,500,000 |  |  |  |  |  |  |
Maximum | ABN $87,458 Facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment installment |  |  |  |  | 550,000 |  |  |  |  |  |  |
Balloon installment |  |  |  |  | $ 12,813,000 |  |  |  |  |  |  |

X
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