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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived Assets (Details) $ in Thousands																	12 Months Ended
	Jul. 06, 2021 USD ($)	Apr. 08, 2021 USD ($)	Jan. 25, 2021 USD ($)	Jan. 22, 2021 USD ($)	Dec. 17, 2020 USD ($) item	Nov. 30, 2020 USD ($)	Nov. 27, 2020 USD ($)	Nov. 03, 2020 USD ($)	Oct. 16, 2020 USD ($)	Sep. 25, 2020 USD ($)	Sep. 17, 2020 USD ($)	Feb. 03, 2020 USD ($)	Nov. 04, 2019 USD ($)	Sep. 25, 2019 USD ($)	Sep. 20, 2019 USD ($)	Aug. 02, 2019 USD ($)	Dec. 31, 2021 $ / item	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Mar. 31, 2020 item	Feb. 24, 2020 item	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Impairment of long-lived assets
Historical one-year time charter average period																	10 years
Time charter average period																	1 year
Estimated useful life																	25 years
Fleet utilization (as a percent)																	98.00%
Estimated scrap value (in dollars per lightweight ton) | $ / item																	310
Impairment of vessel assets																		$ 208,935	$ 27,393
Genco Cougar
Impairment of long-lived assets
Sale of assets						$ 7,600
Broker commission (as a percent)						3.00%
Genco Lorraine
Impairment of long-lived assets
Adjusted net sales price of vessel																		7,751
Impairment of vessel assets																		404
Sale of assets	$ 7,950			$ 7,950
Broker commission (as a percent)	2.50%			2.50%
Baltic Cougar
Impairment of long-lived assets
Adjusted net sales price of vessel																		7,372
Impairment of vessel assets																		790
Baltic Leopard
Impairment of long-lived assets
Adjusted net sales price of vessel																		7,840
Impairment of vessel assets																		399
Sale of assets		$ 8,000	$ 8,000
Broker commission (as a percent)		2.00%	2.00%
Baltic Hare
Impairment of long-lived assets
Adjusted net sales price of vessel																		7,595
Impairment of vessel assets																		$ 769
Sale of assets							$ 7,750
Broker commission (as a percent)							2.00%
Supramax Vessels
Impairment of long-lived assets
Number impaired vessel assets | item																		9
Impairment of vessel assets																		$ 67,200
Ultramax Vessels | Agreement To Exchange Vessels
Impairment of long-lived assets
Number of vessels to be exchanged | item					3
Handysize Vessels | Agreement To Exchange Vessels
Impairment of long-lived assets
Impairment of vessel assets																		4,647
Number of vessels to be exchanged | item					6
Adjusted total fair market value of vessels					$ 46,000
Broker commission (as a percent)					1.00%
Baltic Panther
Impairment of long-lived assets
Adjusted net sales price of vessel																				$ 7,285
Impairment of vessel assets																		3,713
Sale of assets								$ 7,510
Broker commission (as a percent)								3.00%
Genco Loire
Impairment of long-lived assets
Adjusted net sales price of vessel																				$ 7,497
Impairment of vessel assets																		3,408
Sale of assets									$ 7,650
Broker commission (as a percent)									2.00%
Genco Lorraine, Baltic Cougar and Baltic Leopard
Impairment of long-lived assets
Number impaired vessel assets | item																				3
Impairment of vessel assets																		7,963
Baltic Jaguar
Impairment of long-lived assets
Adjusted net sales price of vessel																				$ 7,081
Impairment of vessel assets																		4,140
Sale of assets										$ 7,300
Broker commission (as a percent)										3.00%
Genco Normandy
Impairment of long-lived assets
Adjusted net sales price of vessel																				$ 5,733
Impairment of vessel assets																		2,679
Sale of assets											$ 5,850
Broker commission (as a percent)											2.00%
Genco Picardy, Genco Predator, Genco Provence and Genco Warrior
Impairment of long-lived assets
Number impaired vessel assets | item																					4
Impairment of vessel assets																		27,055
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 Charger
Impairment of long-lived assets
Adjusted net sales price of vessel																			5,099
Impairment of vessel assets																			1,314
Sale of assets												$ 5,150
Broker commission (as a percent)												1.00%
Genco Raptor
Impairment of long-lived assets
Adjusted net sales price of vessel																							$ 9,996
Impairment of vessel assets																			5,812
Sale of assets													$ 10,200
Broker commission (as a percent)													2.00%
Genco Thunder
Impairment of long-lived assets
Adjusted net sales price of vessel																							10,192
Impairment of vessel assets																			5,749
Sale of assets														$ 10,400
Broker commission (as a percent)														2.00%
Genco Champion
Impairment of long-lived assets
Adjusted net sales price of vessel																							$ 6,402
Impairment of vessel assets																			621
Sale of assets															$ 6,600
Broker commission (as a percent)															3.00%
Genco Challenger
Impairment of long-lived assets
Adjusted net sales price of vessel																								$ 5,145
Impairment of vessel assets																			4,401
Sale of assets																$ 5,250
Broker commission (as a percent)																2.00%
Genco Champion and Genco Charger
Impairment of long-lived assets
Impairment of vessel assets																			$ 9,496

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Adjusted net sales price of vessel.

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Number of vessels determined to be impaired.

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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://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=123570139&loc=d3e3179-108585

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