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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

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- 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