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Management fees (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Management fees | $ 7,543,000 | $ 7,604,000 | $ 8,436,000
Ship Procurement Services S.A. ("SPS") |  |  |
Management fees | 7,543,000 | 7,604,000 | 7,985,000
Procurement services daily fee | 295 |  |
Maryville Maritime Inc. |  |  |
Management fees | $ 0 | $ 0 | $ 451,000

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- Definition The daily fee per vessel for procurement services. + References No definition available. + Details
Name: | sblk_ProcurementServicesDailyFee
Namespace Prefix: | sblk_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support. + References No definition available. + Details
Name: | us-gaap_ProfessionalAndContractServicesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_CounterpartyNameAxis=sblk_ShipProcurementServicesS.A.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sblk_MaryvilleMaritimeIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |