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Fair value measurements - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Measurements [Line Items] |  |  |
Amount expected to be reclassified into earnings | $ 123 |  |
Trading Symbol | SBLK |  |
Impairment loss of assets held for use | $ 0 | $ 10,684 | $ 102,578
Impairment loss of disposed assets | 0 | $ 18,537 | 219,400
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |  |
Fair Value Measurements [Line Items] |  |  |
2022 Notes fair value | $ 50,640 |  |
2022 Notes |  |  |
Fair Value Measurements [Line Items] |  |  |
Trading Symbol | SBLKZ |  |
Operating vessels sold and delivered |  |  |
Fair Value Measurements [Line Items] |  |  |
Impairment loss of disposed assets |  |  | 17,815
Operating vessels sold but not yet delivered |  |  |
Fair Value Measurements [Line Items] |  |  |
Impairment loss of disposed assets |  |  | $ 201,585

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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