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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - 10Q (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Jul. 09, 2014
Mar. 31, 2014
Dec. 31, 2014
Vessels, net        
Estimated useful life 25 years      
Estimated life of average scrap value of steel 15 years      
Depreciation expense $ 18,967gnk_DepreciationOfVessels      
Estimated scrap value (in dollars per lightweight ton) 310gnk_VesselsEstimatedScrapValue      
Decrease in depreciation expense 787gnk_DecreaseInDepreciationExpenseAsResultOfIncreaseInEstimatedScrapValue      
Change to basic and diluted net loss per share as a result of decrease in depreciation $ 0.01gnk_IncreaseDecreaseInBasicAndDilutedNetIncomeLossPerShare      
Basic and diluted net loss per share if no change to estimated scrap value $ (0.65)gnk_EarningsPerShareBasicAndDilutedIfNoChangeToScrapValue      
Deferred revenue        
Accrual related to estimated customer claims 725gnk_AccrualRelatedToEstimatedCustomerClaims     662gnk_AccrualRelatedToEstimatedCustomerClaims
Predecessor        
Vessels, net        
Depreciation expense     $ 34,160gnk_DepreciationOfVessels
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Estimated scrap value (in dollars per lightweight ton)   245gnk_VesselsEstimatedScrapValue
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