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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived Assets (Details) $ in Thousands																				3 Months Ended			12 Months Ended
	Feb. 24, 2021 USD ($)	Jan. 25, 2021 USD ($)	Jan. 22, 2021 USD ($)	Jan. 15, 2021 USD ($)	Jan. 04, 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 ($)	Aug. 07, 2018 USD ($)	Jul. 24, 2018 USD ($)	Dec. 31, 2020 USD ($) item	Sep. 30, 2020 USD ($) item	Mar. 31, 2020 USD ($) item	Dec. 31, 2020 USD ($) item $ / item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 24, 2020 item	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Feb. 27, 2018 item
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																				$ 74,225	$ 21,896	$ 112,814	$ 208,935	$ 27,393	$ 56,586
Genco Lorraine
Impairment of long-lived assets
Adjusted net sales price of vessel																				7,751			7,751
Impairment of vessel assets																							404
Baltic Leopard
Impairment of long-lived assets
Adjusted net sales price of vessel																				7,840			7,840
Impairment of vessel assets																							399
Genco Cougar
Impairment of long-lived assets
Sale of assets							$ 7,600
Broker commission (as a percent)							3.00%
Baltic Cougar
Impairment of long-lived assets
Adjusted net sales price of vessel																				7,372			7,372
Impairment of vessel assets																							790
Baltic Hare
Impairment of long-lived assets
Sale of assets								$ 7,750
Broker commission (as a percent)								2.00%
Adjusted net sales price of vessel																				$ 7,595			7,595
Impairment of vessel assets																							$ 769
Supramax Vessels
Impairment of long-lived assets
Number impaired vessel assets | item																				9			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
Number of vessels to be exchanged | item						6
Broker commission (as a percent)						1.00%
Adjusted total fair market value of vessels						$ 46,000
Impairment of vessel assets																							4,647
Baltic Panther
Impairment of long-lived assets
Sale of assets									$ 7,510
Broker commission (as a percent)									3.00%
Adjusted net sales price of vessel																					7,285
Impairment of vessel assets																							3,713
Genco Loire
Impairment of long-lived assets
Sale of assets										$ 7,650
Broker commission (as a percent)										2.00%
Adjusted net sales price of vessel																					$ 7,497
Impairment of vessel assets																							3,408
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
Sale of assets											$ 7,300
Broker commission (as a percent)											3.00%
Adjusted net sales price of vessel																					$ 7,081
Impairment of vessel assets																							4,140
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
Impairment of vessel assets																							2,679
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
Sale of assets													$ 5,150
Broker commission (as a percent)													1.00%
Adjusted net sales price of vessel																								5,099
Impairment of vessel assets																								1,314
Genco Raptor
Impairment of long-lived assets
Sale of assets														$ 10,200
Broker commission (as a percent)														2.00%
Adjusted net sales price of vessel																											$ 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%
Adjusted net sales price of vessel																											10,192
Impairment of vessel assets																								5,749
Genco Champion
Impairment of long-lived assets
Sale of assets																$ 6,600
Broker commission (as a percent)																3.00%
Adjusted net sales price of vessel																											$ 6,402
Impairment of vessel assets																								621
Genco Challenger
Impairment of long-lived assets
Sale of assets																	$ 5,250
Broker commission (as a percent)																	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
Genco Surprise
Impairment of long-lived assets
Sale of assets																		$ 5,300	$ 5,300
Broker commission (as a percent)																		3.00%	3.00%
Adjusted net sales price of vessel																													$ 5,141
Impairment of vessel assets																									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 Lorraine
Impairment of long-lived assets
Sale of assets			$ 7,950
Broker commission (as a percent)			2.50%
Subsequent Event | Baltic Leopard
Impairment of long-lived assets
Sale of assets		$ 8,000
Broker commission (as a percent)		2.00%
Subsequent Event | Baltic Cougar
Impairment of long-lived assets
Sale of assets	$ 7,600
Broker commission (as a percent)	3.00%
Subsequent Event | Baltic Hare
Impairment of long-lived assets
Sale of assets				$ 7,750
Broker commission (as a percent)				2.00%
Subsequent Event | Baltic Panther
Impairment of long-lived assets
Sale of assets					$ 7,510
Broker commission (as a percent)					3.00%

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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=118932676&loc=d3e3179-108585

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