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GENERAL INFORMATION (Details) | 6 Months Ended
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Jun. 30, 2021 item t segment
Segment reporting |
Number of reportable segments | segment | 1
Drybulk Vessels |
Segment reporting |
Number of vessels in fleet | 40
Capacity of vessels | t | 4,368,800
Average age of vessels | 10 years 6 months
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 | 14

X
- Definition Average age of vessels. + References No definition available. + Details
Name: | gnk_AverageAgeOfVessels
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
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
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: |