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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of assets (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 10, 2016 USD ($) | Jun. 08, 2016 item
Impairment of long-lived assets |  |  |  |  |
Impairment of vessel assets | $ 21,993 | $ 69,278 | $ 39,893 |  |
Genco Surprise |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |
Impairment of vessel assets | 3,339 |  |  |  |
Genco Marine |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |
Impairment of vessel assets |  | 1,684 | 4,497 |  |
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 scrapped | item |  |  |  |  | 9
Baltic Lion and Baltic Tiger |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |
Impairment of vessel assets |  |  | $ 35,396 |  |
Genco Beauty, Genco Explorer, Genco Knight, Genco Progress and Genco Vigour |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |
Impairment of vessel assets | 18,654 |  |  |  |
$400 Million Credit Facility | Secured Debt |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 400,000 | $ 400,000 |  | $ 400,000 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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