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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