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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands													3 Months Ended		9 Months Ended
	Nov. 03, 2020 USD ($)	Oct. 16, 2020 USD ($)	Sep. 25, 2020 USD ($)	Sep. 17, 2020 USD ($)	Mar. 05, 2020 USD ($)	Dec. 11, 2019 USD ($)	Nov. 04, 2019 USD ($)	Oct. 21, 2019 USD ($)	Oct. 10, 2019 USD ($)	Sep. 25, 2019 USD ($)	Sep. 20, 2019 USD ($)	Aug. 02, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Mar. 31, 2020 item	Feb. 24, 2020 item	Jun. 30, 2019 USD ($)
Impairment of long-lived assets
Net proceeds from sale of vessels															$ 29,854	$ 6,309
Impairment of vessel assets													$ 21,896	$ 12,182	$ 134,710	26,078
Genco Lorraine, Baltic Cougar and Baltic Leopard
Impairment of long-lived assets
Number impaired vessel assets | item													3		3
Impairment of vessel assets													$ 7,963		$ 7,963
Genco Picardy, Genco Predator, Genco Provence and Genco Warrior
Impairment of long-lived assets
Number impaired vessel assets | item																	4
Impairment of vessel assets															27,046
Baltic Hare, Baltic Fox, Baltic Wind, Baltic Cove, Baltic Breeze, Genco Ocean, Genco Bay, Genco Avra, Genco Mare and Genco Spirit
Impairment of long-lived assets
Number of vessels to be disposed | item																		10
Impairment of vessel assets															85,768
Baltic Wind, Baltic Breeze and Genco Bay
Impairment of long-lived assets
Number of vessels to be disposed | item																	3
Genco Challenger
Impairment of long-lived assets
Sale of assets									$ 5,250			$ 5,250
Broker commission (as a percent)									2.00%			2.00%
Adjusted net sales price of vessel																			$ 5,145
Impairment of vessel assets																4,401
Genco Champion and Genco Charger
Impairment of long-lived assets
Impairment of vessel assets																9,496
Baltic Panther
Impairment of long-lived assets
Adjusted net sales price of vessel													7,285		7,285
Impairment of vessel assets													3,711		3,711
Genco Loire
Impairment of long-lived assets
Adjusted net sales price of vessel													7,497		7,497
Impairment of vessel assets													3,407		3,407
Baltic Jaguar
Impairment of long-lived assets
Sale of assets			$ 7,300
Broker commission (as a percent)			3.00%
Adjusted net sales price of vessel													7,081		7,081
Impairment of vessel assets													4,138		4,138
Genco Normandy
Impairment of long-lived assets
Sale of assets				$ 5,850
Broker commission (as a percent)				2.00%
Adjusted net sales price of vessel													5,733		5,733
Impairment of vessel assets													$ 2,677		$ 2,677
Genco Raptor
Impairment of long-lived assets
Sale of assets						$ 10,200	$ 10,200
Broker commission (as a percent)						2.00%	2.00%
Adjusted net sales price of vessel														9,996		9,996
Impairment of vessel assets														5,812		5,812
Genco Thunder
Impairment of long-lived assets
Sale of assets					$ 10,400					$ 10,400
Broker commission (as a percent)					2.00%					2.00%
Adjusted net sales price of vessel														10,192		10,192
Impairment of vessel assets														5,749		5,749
Genco Champion
Impairment of long-lived assets
Sale of assets								$ 6,600			$ 6,600
Broker commission (as a percent)								3.00%			3.00%
Adjusted net sales price of vessel														6,402		6,402
Impairment of vessel assets														$ 621		$ 621
Subsequent Event | Baltic Panther
Impairment of long-lived assets
Sale of assets	$ 7,510
Broker commission (as a percent)	3.00%
Subsequent Event | Genco Loire
Impairment of long-lived assets
Sale of assets		$ 7,650
Broker commission (as a percent)		2.00%
Subsequent Event | Baltic Jaguar
Impairment of long-lived assets
Sale of assets		$ 7,300
Broker commission (as a percent)		3.00%

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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