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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels held for exchange (Details) $ in Thousands | Dec. 31, 2020 USD ($) item
--- | ---
Vessels, net |
Number of vessels held for exchange | item | 5
Vessels held for exchange | $ | $ 38,214

X
- Definition Number of vessels held for exchange. + References No definition available. + Details
Name: | gnk_NumberOfVesselsHeldForExchange
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The amount of non current vessels held for exchange. + References No definition available. + Details
Name: | gnk_VesselsHeldForExchangeNonCurrent
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant