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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands									3 Months Ended	12 Months Ended
	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 ($)	Aug. 07, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) item	Feb. 28, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 14, 2018 USD ($) item	Jul. 12, 2018 USD ($) item	Jun. 06, 2018 USD ($) item	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
VESSEL ACQUISITIONS
Restricted cash, current									$ 4,947	$ 4,947						$ 5,447	$ 7,234
Number of vessels sold which did not serve as collateral under credit facilities | item										6
Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility									$ 495,000	$ 495,000	$ 495,000
Collateral vessel replacement period									180 days
Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility									$ 108,000	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
Face amount of term loan facility						$ 495,000
Restricted cash, current									$ 4,947	$ 4,947
Period for which sales proceeds from vessels will remain as restricted cash						180 days
Collateral vessel replacement period						180 days
Genco Surprise
VESSEL ACQUISITIONS
Sale of assets								$ 5,300
Broker commission (as a percent)								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%

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