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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Aug. 02, 2019 USD ($)	Aug. 07, 2018 USD ($)	Jul. 24, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Feb. 27, 2018 item
Impairment of long-lived assets
Impairment of vessel assets				$ 13,897	$ 184	$ 13,897	$ 56,586
Genco Challenger
Impairment of long-lived assets
Vessel net sales price				5,145		5,145
Impairment of vessel assets				4,401		4,401
Genco Champion and Genco Charger
Impairment of long-lived assets
Impairment of vessel assets				$ 9,496		$ 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		5,141
Impairment of vessel assets					$ 184		184
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
Subsequent Event | Genco Challenger
Impairment of long-lived assets
Sale of assets	$ 5,250
Broker commission (as a percent)	2.00%

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Represents brokerage commission payable in percentage to the third party.

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Number of vessels determined to be impaired.

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- Definition

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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- Definition

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://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=109223946&loc=d3e3179-108585

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