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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Dec. 17, 2020 USD ($) item | Dec. 07, 2020 USD ($) | Dec. 10, 2019 | Nov. 15, 2019 USD ($) | Nov. 04, 2019 USD ($) | Sep. 20, 2019 USD ($) | Aug. 02, 2019 USD ($) | Apr. 15, 2019 USD ($) | Jan. 28, 2019 USD ($) | Dec. 26, 2018 USD ($) | Dec. 17, 2018 USD ($) | Dec. 05, 2018 USD ($) | Nov. 13, 2018 USD ($) | Oct. 16, 2018 USD ($) | Sep. 13, 2018 USD ($) | Aug. 07, 2018 USD ($) | Jul. 24, 2018 USD ($) | May 31, 2018 | Dec. 31, 2019 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2018 item | Jul. 12, 2018 USD ($) item | Jun. 06, 2018 USD ($) item
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,045 | $ 35,492 |  |  |
Number of vessels sold which did not serve as collateral under credit facilities | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 495,000 |  |  |
Collateral vessel replacement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 days |  |  |  |  |
Secured Debt | $133 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,000 |  |  |
Agreement To Purchase Ultramax And Capesize Vessels | $133 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Committed to be Acquired Under Purchase Agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Aggregate purchase price for vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 141,000
Agreement to Purchase Capesize Drybulk Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Committed to be Acquired Under Purchase Agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Agreement to Purchase Capesize Drybulk Vessels | $133 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Committed to be Acquired Under Purchase Agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Aggregate purchase price for vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,000 |
Agreement To Purchase Ultramax Drybulk Vessels | $133 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Vessels Committed to be Acquired Under Purchase Agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Ultramax Vessels | Agreement To Exchange Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels to be exchanged | item | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Handysize Vessels | Agreement To Exchange Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels to be exchanged | item | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted total fair market value of vessels | $ 46,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Normandy, Genco Loire, Baltic Jaguar, Genco Bay, Baltic Breeze, Baltic Wind, Genco Thunder and Genco Charger | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,492 |  |  |
Period for which sales proceeds from vessels will remain as restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 360 days |  |  |
Genco Champion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  | $ 6,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Challenger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  | $ 5,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Champion and Genco Challenger | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Vessel sale proceeds utilized as a loan repayment |  |  |  | $ 6,880 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,880 |  |  |  |
Collateral vessel replacement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 days |  |  |  |
Genco Vigour |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  | $ 6,550 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Knight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  | $ 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Beauty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  | $ 6,560 |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Genco Muse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  | $ 6,660 |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Genco Cavalier | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Vessel sale proceeds utilized as a loan repayment |  |  |  |  |  |  |  | $ 4,947 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Surprise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,300 | $ 5,300 |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |
Genco Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Genco Explorer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Genco Raptor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 10,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Raptor | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,045 |  |  |  |
Vessel sale proceeds utilized as a loan repayment |  | $ 6,045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral vessel replacement period |  |  | 360 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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