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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands																										3 Months Ended	12 Months Ended
	Dec. 11, 2019 USD ($)	Nov. 15, 2019	Nov. 05, 2019 USD ($)	Nov. 04, 2019 USD ($)	Oct. 21, 2019 USD ($)	Oct. 10, 2019 USD ($)	Sep. 25, 2019 USD ($)	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	May 16, 2017 USD ($)	Mar. 19, 2017 USD ($)	Feb. 16, 2017 USD ($)	Feb. 09, 2017 USD ($)	Jan. 09, 2017 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item	Feb. 28, 2019 USD ($)	Aug. 14, 2018 USD ($) item	Jul. 12, 2018 USD ($) item	Jun. 06, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
VESSEL ACQUISITIONS
Restricted cash, current																											$ 6,045	$ 4,947					$ 7,234	$ 8,242
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	$ 495,000	$ 495,000
Collateral vessel replacement period																				120 days
Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Maximum borrowing capacity																											108,000	108,000		$ 108,000
Agreement To Purchase Ultramax And Capesize Vessels
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																																4
Aggregate purchase price for vessels																																$ 141,000
Agreement To Purchase Ultramax And Capesize Vessels | Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																														6
Agreement to Purchase Capesize Drybulk Vessels
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																															2	2
Aggregate purchase price for vessels																															$ 98,000
Agreement to Purchase Capesize Drybulk Vessels | Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																														4
Agreement To Purchase Ultramax Drybulk Vessels
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																																2
Agreement To Purchase Ultramax Drybulk Vessels | Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Number of vessels committed to be acquired under purchase agreement | item																														2
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
VESSEL ACQUISITIONS
Sale of assets																$ 10,000
Broker commission (as a percent)																2.50%
Genco Cavalier | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current																												$ 4,947
Period for which sales proceeds from vessels will remain as restricted cash																180 days
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			$ 10,200
Broker commission (as a percent)	2.00%			2.00%
Genco Raptor | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current																											$ 6,045
Collateral vessel replacement period	180 days
Genco Thunder
VESSEL ACQUISITIONS
Sale of assets							$ 10,400
Broker commission (as a percent)							2.00%
Genco Thunder | Forecast
VESSEL ACQUISITIONS
Sale of assets																										$ 10,400
Broker commission (as a percent)																										2.00%
Genco Champion
VESSEL ACQUISITIONS
Sale of assets					$ 6,600			$ 6,600
Broker commission (as a percent)					3.00%			3.00%
Genco Champion | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Collateral vessel replacement period					180 days
Genco Challenger
VESSEL ACQUISITIONS
Sale of assets						$ 5,250			$ 5,250
Broker commission (as a percent)						2.00%			2.00%
Genco Challenger | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Period for which sales proceeds from vessels will remain as restricted cash						180 days
Genco Champion and Genco Challenger
VESSEL ACQUISITIONS
Number of vessels sold | item																											2
Genco Champion and Genco Challenger | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Vessel sale proceeds utilized as a loan repayment			$ 6,880																								$ 6,880
Collateral vessel replacement period		180 days
Genco Prosperity
VESSEL ACQUISITIONS
Sale of assets																					$ 3,050
Broker commission (as a percent)																					3.50%
Genco Success
VESSEL ACQUISITIONS
Sale of assets																						$ 2,800
Broker commission (as a percent)																						3.00%
Genco Carrier
VESSEL ACQUISITIONS
Sale of assets																							$ 3,560
Brokerage commission																							$ 92
Genco Reliance
VESSEL ACQUISITIONS
Sale of assets																								$ 3,500
Broker commission (as a percent)																								3.50%
Genco Wisdom
VESSEL ACQUISITIONS
Sale of assets																									$ 3,250
Broker commission (as a percent)																									3.50%

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