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Transactions with Related Parties - Additional Information (Details) | 2 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 USD ($) | Apr. 30, 2014 USD ($) | Jul. 11, 2014 | Jul. 10, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Sep. 09, 2016 shares | Sep. 30, 2013 USD ($) | Oct. 28, 2015 shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Aug. 19, 2014 | Jul. 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate EUR/USD |  |  |  |  |  |  |  |  |  | 1.05 |  |  |  |  |  |  | 1.34
Commission fee for newbuilding vessels |  |  |  |  |  |  |  |  |  | $ 64,570,000 | $ 127,910,000 |  |  |  |  |  |
Daily fixed management fee |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |
Number of directors |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |
Combine Marine Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasing agreements, Office space, Term of contract |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 1 year |  |
Rent expense per month |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600 | € 2,500 |  |
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 |  |  |  |  |  |  |  |  |  | $ 533,000 | 280,000 |  |  |  |  |  |
Daily fixed management fee | $ 170 |  |  |  |  | $ 110 |  |  |  |  |  |  |  |  |  |  |
Vessel acquisition commission, Flat fee |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Supervision costs |  |  |  |  |  |  |  |  |  | $ 415,000 | 850,000 |  |  |  |  |  |
Issuance of shares, representing the third and the fourth installment | shares |  |  |  |  |  |  | 138,453 |  | 34,234 |  |  |  |  |  |  |  |
Managed Vessels of Oceanbulk Shipping LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Daily fixed management fee |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of agreement |  |  |  |  |  |  |  |  |  | Jul. 11, 2014 |  |  |  |  |  |  |
Product Shipping & Trading S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Daily fixed management fee |  |  |  |  | $ 20 |  |  | $ 130 |  |  |  |  |  |  |  |  |
Expiration date of agreement |  |  |  |  |  |  |  |  |  | Jul. 01, 2014 |  |  |  |  |  |  |
Maryville Maritime Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly lump sum management fee per vessel |  |  |  |  |  |  |  |  |  |  | $ 17,500 |  |  |  |  |  |
Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Ownership Percentage |  |  | 61.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capesize vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |
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 |  |  |  |  |  |  |
Heron vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delivery date |  |  |  |  |  |  |  |  |  | December 5, 2014 |  |  |  |  |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Beneficial Ownership Of 40% Or More | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Maximum | Beneficial Ownership of 25% but less than 40% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Maximum | Beneficial Ownership of 15% but less than 25% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Maximum | Beneficial Ownership of 5% but less than 15% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Minimum | Beneficial Ownership Of 40% Or More | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Minimum | Beneficial Ownership of 25% but less than 40% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Minimum | Beneficial Ownership of 15% but less than 25% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Minimum | Beneficial Ownership of 5% but less than 15% | Shareholders Agreement | Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting percentage |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |

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- Definition Flat fee charged per each newbuilding vessel, as commission fee relative to the negotiations with the shipyards on the construction of the Company's contracted newbuilding vessels. + References No definition available. + Details
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