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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disposal of Vessels (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
(Gain) loss on disposal of vessels |  |  |
Gain (Loss) on sale of vessels | $ 7,712 | $ 3,555 | $ (1,210)
Genco Wisdom, Genco Reliance, Genco Carrier, Genco Success And Genco Prosperity |  |  |
(Gain) loss on disposal of vessels |  |  |
Gain (Loss) on sale of vessels | $ 7,712 |  |
Genco Marine, Genco Sugar, Genco Pioneer, Genco Leader, Genco Acheron |  |  |
(Gain) loss on disposal of vessels |  |  |
Gain (Loss) on sale of vessels |  | $ 3,555 |
Baltic Lion and Baltic Tiger |  |  |
(Gain) loss on disposal of vessels |  |  |
Gain (Loss) on sale of vessels |  |  | $ (1,210)

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 + Details
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