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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
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Feb. 24, 2020 USD ($) | Feb. 03, 2020 USD ($) | Dec. 11, 2019 USD ($) | Nov. 04, 2019 USD ($) | Oct. 21, 2019 USD ($) | Oct. 10, 2019 USD ($) | Sep. 25, 2019 USD ($) | Sep. 20, 2019 USD ($) | Aug. 02, 2019 USD ($) | Aug. 07, 2018 USD ($) | Jul. 24, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Feb. 27, 2018 item
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,393 | $ 56,586 | $ 21,993 |  |  |  |
Genco Charger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  | 5,099 |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  | 1,314 |  |  |  |  |  |
Genco Challenger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  | $ 5,250 |  |  | $ 5,250 |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,145 |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  | 4,401 |  |  |  |  |  |
Genco Raptor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  | $ 10,200 | $ 10,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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% |  |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,192 |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  | 5,749 |  |  |  |  |  |
Genco Champion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 6,600 |  |  | $ 6,600 |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  | 3.00% |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,402 |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  | 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 | $ 5,300 |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |
Vessel net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,141 |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 184 | 3,339 |  |  |  |
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 |  |  |  |  |
Genco Beauty, Genco Explorer, Genco Knight, Genco Progress and Genco Vigour |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,654 |  |  |  |
Subsequent Event | Genco Charger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets | $ 5,150 | $ 5,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast | Genco Thunder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  |  |  |  |  | $ 10,400 |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |

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