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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands																			3 Months Ended	12 Months Ended
	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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