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GOODWILL IMPAIRMENT (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
segment
item
Jul. 09, 2014
Goodwill      
Number of operating segments   2us-gaap_NumberOfOperatingSegments  
Number of Reporting Units   2us-gaap_NumberOfReportingUnits  
Period of industry average charter rates for each vessel class   10 years  
Goodwill, Impairment Loss $ 166,067us-gaap_GoodwillImpairmentLoss    
Percentage of fair value assets used method   75.00%gnk_PercentageToMethodOfFairValueAssetsForDeterminingFairValue  
Percentage of public trading price method   25.00%gnk_PercentageToMethodOfPublicTradingPriceForDeterminingFairValue  
Percentage of discounted cash flow method   0.00%gnk_PercentageToMethodOfDiscountedCashFlowsForDeterminingFairValue  
Predecessor      
Goodwill      
Goodwill     $ 166,067us-gaap_Goodwill
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember