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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 04, 2019 USD ($) | Oct. 21, 2019 USD ($) | Oct. 10, 2019 USD ($) | Aug. 07, 2018 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Feb. 27, 2018 item
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  | $ 12,182 | $ 0 | $ 26,078 | $ 56,586 |  |  |
Genco Challenger |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  | $ 5,145 |  |
Impairment of vessel assets |  |  |  |  |  |  |  | 4,401 |  |  |  |
Genco Raptor |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  | 9,996 |  | 9,996 |  |  |  |
Impairment of vessel assets |  |  |  |  |  | 5,812 |  | 5,812 |  |  |  |
Genco Thunder |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  | 10,192 |  | 10,192 |  |  |  |
Impairment of vessel assets |  |  |  |  |  | 5,749 |  | 5,749 |  |  |  |
Genco Champion |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  | 6,402 |  | 6,402 |  |  |  |
Impairment of vessel assets |  |  |  |  |  | $ 621 |  | 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 |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  | 3.00% |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  | $ 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 Challenger |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  | $ 5,250 |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  | 2.00% |  |  |  |  |  |  |  |  |
Subsequent Event | Genco Champion |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  | $ 6,600 |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  | 3.00% |  |  |  |  |  |  |  |  |  |
Forecast | Genco Thunder |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 10,400 |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |
Forecast | Subsequent Event | Genco Raptor |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets | $ 10,200 |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) | 2.00% |  |  |  |  |  |  |  |  |  |  |

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