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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

X

- Definition

Number of vessels for which the Company has determined will more likely than not be scrapped.

+ References

No definition available.

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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

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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

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