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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands							3 Months Ended	9 Months Ended	12 Months Ended
	Nov. 02, 2021 USD ($)	Jul. 06, 2021 USD ($)	Apr. 08, 2021 USD ($)	Dec. 17, 2020 USD ($) item	Jun. 05, 2020	Jun. 04, 2020	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Jul. 02, 2021 USD ($) item	May 18, 2021 USD ($) item	Apr. 20, 2021 USD ($) item
VESSEL ACQUISITIONS
Restricted Cash, Current							$ 0	$ 0
Deposits on vessels							17,702	17,702
Restricted cash, current									$ 35,492
Amortization of fair market value of time charters acquired							2,043	2,043
Unamortized fair market value of time charters acquired							$ 2,220	2,220
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
Collateral vessel replacement period					360 days	180 days			360 days
Number of vessels sold which served as collateral | item									8
Genco Mayflower, Genco Constellation and Genco Madeleine
VESSEL ACQUISITIONS
Number of vessels with below market time charters							3
Time charters acquired							$ 4,263	4,263
Agreement To Exchange Vessels
VESSEL ACQUISITIONS
Adjusted total fair market value of vessels				$ 46,000
Broker commission (as a percent)				1.00%
Agreement To Purchase Ultramax Newbuild Vessels | Genco Mayflower and Genco Constellation
VESSEL ACQUISITIONS
Number of vessels purchased under option to be acquired per purchase agreement | item										2
Capacity of vessels | item										63,000
Purchase price per vessel										$ 24,563
Agreement To Purchase Ultramax Newbuild Vessels | Genco Mary and Genco Laddey
VESSEL ACQUISITIONS
Number of vessels purchased under option to be acquired per purchase agreement | item											2
Capacity of vessels | item											61,000
Purchase price per vessel											$ 29,170
Deposits on vessels							17,702	17,702
Remaining purchase price of the vessels							40,838	40,838
Capitalized interest associated with new building contracts							$ 132	$ 186
Agreement To Purchase Ultramax Vessels | Genco Madeleine
VESSEL ACQUISITIONS
Capacity of vessels | item										63,000
Purchase price per vessel										$ 21,875
Agreement To Purchase Ultramax Vessels | Genco Enterprise
VESSEL ACQUISITIONS
Capacity of vessels | item												64,000
Purchase price per vessel												$ 20,200
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
Baltic Leopard
VESSEL ACQUISITIONS
Sale of assets			$ 8,000
Broker commission (as a percent)			2.00%
Genco Lorraine
VESSEL ACQUISITIONS
Sale of assets		$ 7,950
Broker commission (as a percent)		2.50%
Genco Provence
VESSEL ACQUISITIONS
Sale of assets	$ 13,250
Broker commission (as a percent)	2.50%

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