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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2014	Jul. 09, 2014 Predecessor	Sep. 30, 2013 Predecessor	Jul. 09, 2014 Predecessor	Sep. 30, 2013 Predecessor
Voyage expense recognition
Net (gains) losses on purchase and sale of bunker fuel	$ (36)	$ (3)	$ 296	$ (252)	$ (47)

X

- Definition

Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer.

+ References

No definition available.

+ Details

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

X

- Details

Name:	gnk_VoyageExpenseRecognitionAbstract
Namespace Prefix:	gnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration