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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands								3 Months Ended
	Oct. 16, 2018 USD ($)	Sep. 13, 2018 USD ($)	May 16, 2017 USD ($)	Mar. 19, 2017 USD ($)	Feb. 16, 2017 USD ($)	Feb. 09, 2017 USD ($)	Jan. 09, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Aug. 14, 2018 USD ($) item	Jul. 12, 2018 USD ($) item	Jun. 06, 2018 USD ($) item	May 31, 2018 USD ($)
Secured Debt | $460 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility									$ 460,000				$ 460,000
Secured Debt | $108 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility									$ 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 Cavalier | Subsequent Event
VESSEL ACQUISITIONS
Sale of assets	$ 10,000
Broker commission (as a percent)	2.50%
Genco Cavalier | Subsequent Event | Secured Debt | $460 Million Credit Facility
VESSEL ACQUISITIONS
Face amount of term loan facility	$ 460,000
Genco Progress
VESSEL ACQUISITIONS
Sale of assets		$ 5,600
Broker commission (as a percent)		3.00%
Genco Explorer | Forecast
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%

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Represents the number of vessels committed to be acquired by the entity under purchase agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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