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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived Assets (Details) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 item | Feb. 24, 2020 item
Impairment of long-lived assets |  |  |  |
Impairment of vessel assets | $ | $ 0 | $ 112,814 |  |
Genco Picardy, Genco Predator, Genco Provence and Genco Warrior |  |  |  |
Impairment of long-lived assets |  |  |  |
Number impaired vessel assets | item |  |  | 4 |
Impairment of vessel assets | $ |  | 27,046 |  |
Baltic Hare, Baltic Fox, Baltic Wind, Baltic Cove, Baltic Breeze, Genco Ocean, Genco Bay, Genco Avra, Genco Mare and Genco Spirit |  |  |  |
Impairment of long-lived assets |  |  |  |
Number of vessels to be disposed | item |  |  |  | 10
Impairment of vessel assets | $ |  | $ 85,768 |  |
Baltic Wind, Baltic Breeze and Genco Bay |  |  |  |
Impairment of long-lived assets |  |  |  |
Number of vessels to be disposed | item |  |  | 3 |

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 The number of vessels to be disposed. + References No definition available. + Details
Name: | gnk_NumberOfVesselsToBeSold
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_GencoPicardyGencoPredatorGencoProvenceAndGencoWarriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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