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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: