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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Sale of Vessels (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 item	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Gain on sale of vessels
(Loss) gain on sale of vessels	$ (358)		$ (844)	$ 611
Number of vessels sold | item		0
Baltic Wind and Baltic Breeze
Gain on sale of vessels
(Loss) gain on sale of vessels	$ (358)
Genco Charger and Genco Thunder
Gain on sale of vessels
(Loss) gain on sale of vessels			$ (844)
Genco Vigour
Gain on sale of vessels
(Loss) gain on sale of vessels				$ 611

X

- Definition

Represents information pertaining to number of vessels sold by the entity.

+ References

No definition available.

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Namespace Prefix:	gnk_
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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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