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Transactions with Related Parties - Additional Information (Details) | 4 Months Ended | 6 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended |  |
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Apr. 30, 2014 USD ($) | Jul. 11, 2014 | Sep. 09, 2016 shares | Oct. 28, 2015 shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 21, 2016 USD ($) | Dec. 21, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2014 USD ($) | Aug. 19, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate EUR/USD |  |  |  |  | 1.2 |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  | $ 5,325,000 | $ 3,550,000 |  |  | $ 1,025,000 |  |  |  |  |
Commission fee for newbuilding vessels |  |  |  |  | $ 48,574,000 | 64,570,000 |  |  |  |  |  |  |  |
Number of directors |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Excel Vessel Bridge Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 231,000,000 |
Combine Marine Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasing agreements, Office space, Term of contract |  |  |  |  |  |  |  |  |  |  | 1 year | 1 year |  |
Rent expense per month |  |  |  |  |  |  |  |  |  |  | $ 3,000 | € 2,500 |  |
Rent expense |  |  |  |  | $ 35,000 | 34,000 |  |  | 35,000 |  |  |  |  |
Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuilding contracts |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Vessel acquisition commission percentage |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Related Parties Commissions Fees |  |  |  |  | $ 2,077,000 |  |  |  |  |  |  |  |  |
Pre-delivery installments | $ 519,000 |  |  |  |  |  |  |  |  | $ 519,000 |  |  |  |
Number of installments |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Commission fee for newbuilding vessels |  |  |  |  |  | 813,000 |  |  |  |  |  |  |  |
Vessel acquisition commission, Flat fee |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |
Supervision costs |  |  |  |  |  | $ 415,000 |  |  |  |  |  |  |  |
Issuance of shares, representing the third and the fourth installment | shares |  |  | 138,453 | 34,234 |  |  |  |  |  |  |  |  |  |
Maryville Maritime Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly lump sum management fee per vessel |  |  |  |  |  |  |  |  | $ 17,500 |  |  |  |  |
Alma Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasing agreements, Office space, Term of contract |  |  |  |  |  |  | 6 years | 6 years |  |  |  |  |  |
Rent expense per month |  |  |  |  |  |  | $ 400 | € 300 |  |  |  |  |  |
Rent expense |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |
StarOcean Manning Philippines Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Equity method investment (included in Other Current Assets) |  |  |  |  | $ 21,000 |  |  |  |  |  |  |  |  |
Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |
Capesize vessels | Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuilding contracts |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Newcastlemax vessels | Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuilding contracts |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Ultramax vessels | Oceanbulk Maritime S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuilding contracts |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Excel Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 34
Beneficial Ownership of 25% but less than 40% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Beneficial Ownership of 15% but less than 25% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Beneficial Ownership of 5% but less than 15% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors |  |  |  |  | 1 |  |  |  |  |  |  |  |  |

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