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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Voyage expense recognition
Net gains on purchase and sale of bunker fuel	$ 66	$ 364

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

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- Details

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