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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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