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GENERAL INFORMATION (Details)	3 Months Ended
	Mar. 31, 2021 item t segment
Segment reporting
Number of reportable segments | segment	1
Drybulk Vessels
Segment reporting
Number of vessels in fleet	41
Capacity of vessels | t	4,422,300
Average age of vessels	10 years 3 months 18 days
Capesize Drybulk Carriers
Segment reporting
Number of vessels in fleet	17
Ultramax Vessels
Segment reporting
Number of vessels in fleet	9
Supramax Vessels
Segment reporting
Number of vessels in fleet	15

X

- Definition

Average age of vessels.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the capacity of vessels expressed in deadweight tonnage (dwt), a measure of weight a ship is carrying or can safely carry.

+ References

No definition available.

+ Details

Name:	gnk_CapacityOfVesselsInDeadweightTonnage
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of vessels in the fleet.

+ References

No definition available.

+ Details

Name:	gnk_NumberOfVesselsInFleet
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	gnk_VesselByTypeAxis=gnk_DrybulkVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gnk_VesselByTypeAxis=gnk_CapesizeDrybulkVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gnk_VesselByTypeAxis=gnk_UltramaxDrybulkVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gnk_VesselByTypeAxis=gnk_SupramaxDrybulkVesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: