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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of Vessel Assets (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) item | Sep. 30, 2023 USD ($) item
Impairment of long-lived assets |  |
Impairment of vessel assets | $ 28,102 | $ 28,102
Genco Claudius, Genco Commodus and Genco Maximus |  |
Impairment of long-lived assets |  |
Number impaired vessel assets | item | 3 | 3
Impairment of vessel assets | $ 28,102 | $ 28,102

X
- Definition Number of vessels determined to be impaired. + References No definition available. + Details
Name: | gnk_NumberOfVesselAssetsImpaired
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of write-down of vessel assets, including but not limited to, assets to be disposed of and held-for-use. + References No definition available. + Details
Name: | gnk_VesselAssetImpairmentCharges
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AssetImpairmentChargesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=gnk_GencoClaudiusGencoCommodusAndGencoMaximusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |