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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Payment of PIK interest	$ 5,341	$ 0

X

- Definition

Represents cash outflow for PIK interest.

+ References

No definition available.

+ Details

Name:	gnk_PaymentsForPaidInKindInterest
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration