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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)

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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