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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived assets (Details) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Oct. 04, 2024 USD ($) | Jul. 16, 2024 USD ($) | Apr. 22, 2024 USD ($) | Apr. 02, 2024 USD ($) | Feb. 07, 2024 USD ($) | Dec. 21, 2023 USD ($) | Nov. 14, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) $ / item | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 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 |  |  |  |  |  |  |  |  | 400 |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  | $ 6,595 | $ 41,719 | $ 0 |  |
Loss on the disposal of replaced equipment |  |  |  |  |  |  |  |  | 961 | 0 | $ 0 |  |
Genco Claudius, Genco Commodus and Genco Maximus |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Number impaired vessel assets | item |  |  |  |  |  |  |  |  |  |  |  |  | 3
Impairment of vessel assets |  |  |  |  |  |  |  |  |  | 28,102 |  |  |
Genco Claudius, Genco Commodus and Genco Maximus | Agreement to sell Genco Claudius, Genco Commodus and Genco Maximus |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  |  | 13,617 |  |  |
Genco Maximus |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  | $ 22,800 |  | $ 18,000 |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  | 2.00% |  | 1.00% |  |  |  |  |  |  |
Net sales price of vessel |  |  |  |  |  |  |  |  |  | 17,820 |  |  |
Genco Claudius |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  | $ 24,200 |  |  | $ 18,500 |  |  |  |  |  |  |
Broker commission (as a percent) |  |  | 2.00% |  |  | 1.00% |  |  |  |  |  |  |
Net sales price of vessel |  |  |  |  |  |  |  |  |  | 18,315 |  |  |
Genco Commodus |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 19,500 |  | $ 19,500 |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  | 1.00% |  | 1.00% |  |  |  |  |  |
Net sales price of vessel |  |  |  |  |  |  |  |  |  | $ 19,305 |  |  |
Genco Hadrian |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |  |  | $ 5,634 |  |  |  |
Sale of assets | $ 25,000 | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |
Net sales price of vessel |  |  |  |  |  |  |  |  |  |  |  | $ 24,500 |
Genco Claudius and Genco Maximus |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel deposits retained due to termination of agreement |  |  |  |  |  |  |  | $ 3,650 |  |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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