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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands																					1 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 ($)	Aug. 07, 2018 USD ($)	Jul. 24, 2018 USD ($)	May 16, 2017 USD ($)	Mar. 19, 2017 USD ($)	Feb. 16, 2017 USD ($)	Feb. 09, 2017 USD ($)	Jan. 09, 2017 USD ($)	Dec. 12, 2016 USD ($)	Nov. 04, 2016 USD ($)	Oct. 26, 2016 USD ($)	Oct. 21, 2016 USD ($)	Oct. 20, 2016 USD ($)	May 17, 2016 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 28, 2019 USD ($)	Aug. 14, 2018 USD ($) item	Jul. 12, 2018 USD ($) item	Jun. 06, 2018 USD ($) item	May 31, 2018 USD ($)	Nov. 10, 2016 USD ($)	Dec. 31, 2014 USD ($)	Aug. 12, 2010 USD ($)
VESSEL ACQUISITIONS
Net proceeds from sale of vessel assets																						$ 44,330	$ 15,513	$ 13,024
Number of vessels sold | item																						6
Line of Credit Facility | $148 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																								148,000							$ 148,000
Secured Debt | $460 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																						$ 460,000							$ 460,000
Repayment of secured debt																						15,000	0	0
Secured Debt | $400 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																							400,000	400,000						$ 400,000
Repayment of secured debt																						399,600	400	0
Secured Debt | $100 Million Term Loan Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																								100,000								$ 100,000
Repayment of secured debt																								60,099
Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																						108,000				$ 108,000
Repayment of secured debt																						$ 1,580	$ 0	$ 0
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
Subsequent Event | Secured Debt | $460 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																									$ 460,000
Genco Vigour | Subsequent Event
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%
Net proceeds from sale of vessel assets						$ 4,947
Period of sales proceeds form vessels will remains as restricted cash						180 days
Genco Cavalier | Secured Debt | $460 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility						$ 460,000
Genco Surprise
VESSEL ACQUISITIONS
Sale of assets								$ 5,300	$ 5,300
Broker commission (as a percent)								3.00%	3.00%
Net proceeds from sale of vessel assets																					$ 5,141
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 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%
Genco Acheron
VESSEL ACQUISITIONS
Sale of assets															$ 3,480
Broker commission (as a percent)															5.50%
Genco Leader
VESSEL ACQUISITIONS
Sale of assets																$ 3,470
Broker commission (as a percent)																3.00%
Genco Leader | Line of Credit Facility | $148 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																$ 148,000
Repayment of secured debt																$ 3,366
Genco Pioneer
VESSEL ACQUISITIONS
Sale of assets																	$ 2,650
Broker commission (as a percent)																	5.50%
Genco Pioneer | Line of Credit Facility | $148 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																	$ 148,000
Repayment of secured debt																	$ 2,504
Genco Sugar
VESSEL ACQUISITIONS
Sale of assets																			$ 2,450
Broker commission (as a percent)																			5.50%
Genco Sugar | Secured Debt | $100 Million Term Loan Facility
VESSEL ACQUISITIONS
Face amount of term loan facility																		$ 100,000
Repayment of secured debt																		$ 2,315
Genco Marine
VESSEL ACQUISITIONS
Sale of assets																				$ 2,187
Broker commission (as a percent)																				2.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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