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Fair value measurements - Additional Information (Details) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 01, 2015 USD ($) | Jul. 01, 2015 USD ($) | Apr. 28, 2014 | Sep. 30, 2013 | Jun. 30, 2013 USD ($)
Derivative |  |  |  |  |  |  |  |
Number of interest rate derivatives held by the Company | 9 | 9 |  |  |  |  |  |
Amount expected to be reclassified into earnings | $ (354) |  |  |  |  |  |  |
Trading Symbol | SBLK |  |  |  |  |  |  |
Impairrment loss | $ 29,221 | $ 321,978 | $ 0 |  |  |  |  |
Impairment loss of assets held for use | 10,684 | 102,578 |  |  |  |  |  |
Impairment loss of disposed assets | $ 18,537 | 219,400 |  |  |  |  |  |
Credit Agricole Corporate and Investment Bank $70,000 facility |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  |  |  |  |  | 2
Number of loan tranches | 2 |  |  |  |  |  |  |
Credit Agricole Corporate and Investment Bank $70,000 facility | Tranche A |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Maturity date | Aug. 09, 2018 |  |  |  |  |  |  |
Derivative asset, Notional amount | $ 22,956 |  |  |  |  |  |  | $ 26,840
Fixed rate, per annum |  |  |  |  |  |  |  | 1.705%
Credit Agricole Corporate and Investment Bank $70,000 facility | Tranche B |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Maturity date | Nov. 09, 2018 |  |  |  |  |  |  |
Derivative asset, Notional amount | $ 24,131 |  |  |  |  |  |  | $ 28,628
Fixed rate, per annum |  |  |  |  |  |  |  | 1.72%
HSH Nordbank AG $35,000 facility |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  |  |  | 2 |  |
Percentage of debt hedged by interest rate swap agreement |  |  |  |  |  | 50.00% |  |
Maturity date | Sep. 28, 2018 |  |  |  |  |  |  |
Derivative asset, Notional amount | $ 14,177 |  |  |  |  |  |  |
Fixed rate, per annum |  |  |  |  |  | 1.765% |  |
Goldman Sachs |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  |  |  |  | 5 |
Maturity date | Apr. 01, 2018 |  |  |  |  |  |  |
Derivative asset, Notional amount | $ 412,074 |  |  | $ 461,264 | $ 186,307 |  |  |
Accumulated other comprehensive income / (loss) - Interest rate swaps | 649 |  |  |  |  |  |  |
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
8.00% 2019 Notes fair value | $ 43,342 |  |  |  |  |  |  |
8.00% 2019 Notes |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Trading Symbol | SBLKL |  |  |  |  |  |  |
Two newbuilding contracts |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Impairrment loss | $ 1,068 |  |  |  |  |  |  |
Number of newbuilding contracts terminated | 2 |  |  |  |  |  |  |
Operating vessels sold and delivered |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Impairment loss of disposed assets |  | 17,815 |  |  |  |  |  |
Operating vessels sold but not yet delivered |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Impairment loss of disposed assets |  | $ 201,585 |  |  |  |  |  |
Minimum | Goldman Sachs |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Fixed rate, per annum |  |  |  |  |  |  | 1.79% |
Maximum | Goldman Sachs |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Fixed rate, per annum |  |  |  |  |  |  | 2.07% |

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