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Fair Value Measurements and Hedging - Additional Information (Details) € in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 30, 2018 EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Trading Symbol |  | SBLK | SBLK |  |  |
Amount reclassified into earnings |  | $ 114 |  | $ 527 | $ 570 |
Amount of cash held | $ 204,921 | 204,921 |  | 257,911 | 181,758 |
Foreign exchange gain/ (loss) |  | (3,159) |  |  |  |
Fair value hedge gain/ (loss) |  | 1,609 |  | 0 | 0 |
Impairment loss of disposed assets |  |  |  |  | 18,537 |
Impairment loss of assets held for use |  |  |  |  | 10,684 |
Impairment loss |  | 17,784 |  | 0 | $ 29,221 |
Fair value hedging |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Amount of cash held | € |  |  |  |  |  | € 70,800
Fair value hedge gain/ (loss) | 1,609 |  |  |  |  |
Ineffective portion of fair value hedge |  | 39 |  |  |  |
Payments for vessels upgrade | € |  |  | € 20,500 |  |  |
Fair value hedging | Fixed orders |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Amount of cash held | € |  |  |  |  |  | € 20,500
Percentage of coverage through foreign currency hedging |  |  |  |  |  | 100.00%
Fair value hedging | Optional orders |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Percentage of coverage through foreign currency hedging |  |  |  |  |  | 50.00%
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
2022 Notes fair value | $ 49,800 | $ 49,800 |  | $ 50,640 |  |
8.30% 2022 Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Trading Symbol |  | SBLKZ | SBLKZ |  |  |

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