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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands												3 Months Ended	12 Months Ended
	Feb. 24, 2020 USD ($)	Feb. 03, 2020 USD ($)	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 ($)	Aug. 07, 2018 USD ($)	Jul. 24, 2018 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Feb. 27, 2018 item
Impairment of long-lived assets
Impairment of vessel assets													$ 27,393	$ 56,586	$ 21,993
Genco Charger
Impairment of long-lived assets
Vessel net sales price													5,099
Impairment of vessel assets													1,314
Genco Challenger
Impairment of long-lived assets
Sale of assets						$ 5,250			$ 5,250
Broker commission (as a percent)						2.00%			2.00%
Vessel net sales price																	$ 5,145
Impairment of vessel assets													4,401
Genco Raptor
Impairment of long-lived assets
Sale of assets			$ 10,200	$ 10,200
Broker commission (as a percent)			2.00%	2.00%
Vessel net sales price																$ 9,996
Impairment of vessel assets													5,812
Genco Thunder
Impairment of long-lived assets
Sale of assets							$ 10,400
Broker commission (as a percent)							2.00%
Vessel net sales price																10,192
Impairment of vessel assets													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%
Vessel net sales price																$ 6,402
Impairment of vessel assets													621
Genco Champion and Genco Charger
Impairment of long-lived assets
Impairment of vessel assets													$ 9,496
Genco Surprise
Impairment of long-lived assets
Sale of assets										$ 5,300	$ 5,300
Broker commission (as a percent)										3.00%	3.00%
Vessel net sales price																		$ 5,141
Impairment of vessel assets														184	3,339
Genco Cavalier, Genco Loire, Genco Lorraine, Genco Muse, Genco Normandy, Baltic Cougar, Baltic Jaguar, Baltic Leopard and Baltic Panther
Impairment of long-lived assets
Number impaired vessel assets | item																			9
Impairment of vessel assets														$ 56,402
Genco Beauty, Genco Explorer, Genco Knight, Genco Progress and Genco Vigour
Impairment of long-lived assets
Impairment of vessel assets															$ 18,654
Subsequent Event | Genco Charger
Impairment of long-lived assets
Sale of assets	$ 5,150	$ 5,150
Broker commission (as a percent)	1.00%	1.00%
Forecast | Genco Thunder
Impairment of long-lived assets
Sale of assets												$ 10,400
Broker commission (as a percent)												2.00%

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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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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-Topic 230
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