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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands				1 Months Ended	12 Months Ended
	Aug. 07, 2018 USD ($)	Jul. 24, 2018 USD ($)	May 17, 2016 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 27, 2018 item	Jun. 08, 2016 item
Impairment of long-lived assets
Impairment of vessel assets					$ 56,586	$ 21,993	$ 69,278
Net proceeds from sale of vessels					44,330	15,513	13,024
Genco Surprise
Impairment of long-lived assets
Impairment of vessel assets					184	3,339
Sale of assets	$ 5,300	$ 5,300
Broker commission (as a percent)	3.00%	3.00%
Net proceeds from sale of vessels				$ 5,141
Genco Cavalier, Genco Loire, Genco Lorraine, Genco Muse, Genco Normandy, Baltic Cougar, Baltic Jaguar, Baltic Leopard and Baltic Panther
Impairment of long-lived assets
Impairment of vessel assets					$ 56,402
Number impaired vessel assets | item								9
Genco Beauty, Genco Explorer, Genco Knight, Genco Progress and Genco Vigour
Impairment of long-lived assets
Impairment of vessel assets						$ 18,654
Genco Acheron, Genco Carrier, Genco Leader, Genco Pioneer, Genco Prosperity, Genco Reliance, Genco Success, Genco Sugar, Genco Wisdom
Impairment of long-lived assets
Impairment of vessel assets							67,594
Number of vessels to be disposed | item									9
Genco Marine
Impairment of long-lived assets
Impairment of vessel assets							$ 1,684
Sale of assets			$ 2,187
Broker commission (as a percent)			2.00%

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Number of vessels determined to be impaired.

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Number of vessels for which the Company has determined will more likely than not be scrapped.

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The cash inflow from the sale of Vessel Assets net.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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.

+ References

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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