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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels held for sale (Details) - Genco Claudius And Genco Maximus - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024
Vessels, net |  |  |
Vessel deposits retained due to termination of agreement |  | $ 3,650 |
Net Gain on Sale of Vessels |  |  |
Vessels, net |  |  |
Vessel deposits received and recorded | $ 3,650 |  | $ 3,650

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

X
- Definition Represents the amount of vessel deposits received and recorded during the period. + References No definition available. + Details
Name: | gnk_VesselsDepositsRecorded
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of vessel deposits retained due to termination of the agreement. + References No definition available. + Details
Name: | gnk_VesselsDepositsRetainedPerTerminationOfAgreement
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=gnk_GainLossOnSaleOfVesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |