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Vessels and other fixed assets, net (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2016 USD ($) | Jan. 06, 2016 USD ($) | Mar. 02, 2016 USD ($) | Feb. 26, 2016 USD ($) | Mar. 13, 2015 USD ($) | Feb. 27, 2015 USD ($) | Apr. 02, 2015 USD ($) | Mar. 31, 2015 USD ($) | May 28, 2015 USD ($) | May 27, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  |  |  |  |  | $ 388,660 | $ 317,538 |
Prepayments of lines of credit |  |  |  |  |  |  |  |  |  |  | 111,407 |  |
Loss on sale of vessel |  |  |  |  |  |  |  |  |  |  | 21 | 13,389 |
Impairment loss |  |  |  |  |  |  |  |  |  |  | 6,694 | 28,829 |
Amortization of deferred gain |  |  |  |  |  |  |  |  |  |  | 37 | $ 0 |
Sinosure Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  |  | 42,011 |  |
DNB-SEB-CEXIM $227,500 Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  |  | $ 23,400 |  |
Indomitable |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | Jan. 08, 2015 |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,942
Indomitable | BNP $32,480 Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,480
Honey Badger |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | February 27, 2015 |  |
Payments to acquire property plant and equipment |  |  |  |  |  | $ 19,422 |  |  |  |  |  |  |
Wolverine |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | February 27, 2015 |  |
Payments to acquire property plant and equipment |  |  |  |  |  | $ 19,422 |  |  |  |  |  |  |
Honey Badger and Wolverine | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  | $ 38,162 |  |  |  |  |  |  |  |
Gargantua |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | April 2, 2015 |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  | $ 37,682 |  |  |  |  |  |
Gargantua | DNB-SEB-CEXIM $227,500 Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  | $ 32,400 |  |  |  |  |  |
Deep Blue |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | May 27, 2015 |  |
Payments to acquire property plant and equipment |  |  |  |  |  |  |  |  |  | $ 34,982 |  |  |
Deep Blue | DVB $31,000 Deep Blue Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  |  |  |  |  |  |  | $ 28,680 |  |  |
Idee Fixe |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | March 25, 2015 |  |
Roberta |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | March 31, 2015 |  |
Laura |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | April 7, 2015 |  |
Kaley |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | June 26, 2015 |  |
Excel Vessels |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  |  | 34 |  |
Number of vessels delivered |  |  |  |  |  |  |  |  |  |  |  | 6 |
Shares to acquire vessels | shares |  |  |  |  |  |  |  |  |  |  |  | 851,577 |
Payments to acquire property plant and equipment |  |  |  |  |  |  |  |  |  |  |  | $ 39,475 |
Star Julia |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Feb. 04, 2015 |  |
Star Tatianna |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Feb. 09, 2015 |  |
Rodon |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Mar. 12, 2015 |  |
Star Monika |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Apr. 07, 2015 |  |
Impairment loss of disposed assets |  |  |  |  |  |  |  | $ 1,080 |  |  |  |  |
Star Julia, Star Tatianna, Star Monika and Star Kim | Excel Vessel CiT Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments of lines of credit |  |  |  |  |  |  |  |  |  |  |  | 18,181 |
Star Big |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Jun. 04, 2015 |  |
Star Christianna |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Jun. 23, 2015 |  |
Star Mega |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal date |  |  |  |  |  |  |  |  |  |  | Jun. 17, 2015 |  |
Maiden Voyage |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  | $ 8,282 |  |  |  |
Leasing arrangements, Term of time charter contract |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Sale Leaseback Transaction, Deferred Gain, Gross |  |  |  |  |  |  |  |  |  |  | $ 148 |  |
Sale Leaseback Transaction, Deferred Gain, Net |  |  |  |  |  |  |  |  |  |  | 90 |  |
Amortization of deferred gain |  |  |  |  |  |  |  |  |  |  | $ 37 |  |
Maiden Voyage | Impairment charge, Fair value adjustment portion |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  | $ 4,411 |  |  |  |
Star Lutas |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | January 6, 2016 |  |
Payments to acquire property plant and equipment |  | $ 19,770 |  |  |  |  |  |  |  |  |  |  |
Star Lutas | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  | $ 14,813 |  |  |  |  |  |  |  |  |  |  |
Kennadi |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | January 8, 2016 |  |
Payments to acquire property plant and equipment | $ 21,229 |  |  |  |  |  |  |  |  |  |  |  |
Kennadi | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down | $ 14,478 |  |  |  |  |  |  |  |  |  |  |  |
Star Poseidon |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | February 26, 2016 |  |
Payments to acquire property plant and equipment |  |  |  | $ 33,391 |  |  |  |  |  |  |  |  |
Star Poseidon | DNB-SEB-CEXIM $227,500 Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  |  | $ 23,400 |  |  |  |  |  |  |  |  |
Mackenzie |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | March 2, 2016 |  |
Payments to acquire property plant and equipment |  |  | $ 18,221 |  |  |  |  |  |  |  |  |  |
Mackenzie | Sinosure Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn down |  |  | $ 12,720 |  |  |  |  |  |  |  |  |  |
Star Marisa |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | March 11, 2016 |  |
Star Libra |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  |  | June 6, 2016 |  |
Star Michele |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss of disposed assets |  |  |  |  |  |  |  |  |  |  | $ 5,626 |  |
Idee Fixe, Roberta, Laura, Kaley, Star Marisa and Star Libra |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital leased assets, Number of vessels |  |  |  |  |  |  |  |  |  |  | 6 |  |
Interest and finance costs |  |  |  |  |  |  |  |  |  |  | $ 3,016 | $ 872 |
Capital leased assets, Net book value |  |  |  |  |  |  |  |  |  |  | 232,835 |  |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  | $ 5,984 |  |

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