XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.21.2

GENERAL INFORMATION (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($) item t segment
Segment reporting |
Number of reportable segments | segment | 1
Drybulk Vessels |
Segment reporting |
Number of vessels in fleet | 43
Capacity of vessels | t | 4,568,600
Average age of vessels | 10 years 2 months 12 days
Capesize Drybulk Carriers |
Segment reporting |
Number of vessels in fleet | 17
Ultramax Vessels |
Segment reporting |
Number of vessels in fleet | 13
Supramax Vessels |
Segment reporting |
Number of vessels in fleet | 13
GSSM | Variable Interest Entity |
Segment reporting |
Ownership percentage | 50.00%
Payments to acquire ownership interest | $ | $ 50
GSSM | Synergy |
Segment reporting |
Ownership by synergy | 50.00%
Payments to acquire ownership interest | $ | $ 50

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 Variable interest entity ownership percentage held by third party. + References No definition available. + Details
Name: | gnk_VariableInterestEntityOwnershipPercentageHeldByThirdParty
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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
- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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: |

X
- Details
Name: | srt_OwnershipAxis=gnk_GsShipmanagementPte.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=gnk_SynergyMarinePte.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |