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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2015
Jul. 09, 2014
Mar. 31, 2014
Aug. 07, 2014
Mar. 13, 2014
Mar. 03, 2010
Aug. 06, 2014
Dec. 31, 2014
Number of Shares                
Balance at the end of the period (in shares) 1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber              
MIP Warrants                
Weighted Average Exercise price                
Weighted-average remaining contractual life 5 years 4 months 10 days              
Additional disclosures                
Total fair value of outstanding awards upon emergence from bankruptcy       54,436gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
       
2005 and 2012 GS&T Plans | Predecessor                
Number of Shares                
Vested (in shares)   (880,465)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Baltic Trading Plan | Baltic Trading Limited                
Number of Shares                
Balance at the beginning of the period (in shares) 1,941,844us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Balance at the end of the period (in shares) 1,941,844us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Weighted Average Grant Date Price                
Balance at the beginning of the period (in dollars per share) 3.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Balance at the end of the period (in dollars per share) 3.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Additional disclosures                
Total fair value of shares vested 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Unrecognized compensation cost 4,457us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
             
Weighted-average period for recognition of unrecognized compensation cost 3 years 11 days              
Baltic Trading Plan | Predecessor | Baltic Trading Limited                
Additional disclosures                
Total fair value of shares vested     774us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Aggregate number of shares of common stock available for awards         6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
2014 MIP Plan                
Number of Shares                
Balance at the beginning of the period (in shares) 1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Vested (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Balance at the end of the period (in shares) 1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Weighted Average Grant Date Price                
Balance at the beginning of the period (in dollars per share) 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Balance at the end of the period (in dollars per share) 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Unrecognized compensation cost 13,403us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Weighted-average period for recognition of unrecognized compensation cost 2 years 4 months 10 days              
Aggregate number of shares of common stock available for awards   9,668,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
        250,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
 
Percentage of common stock outstanding ( In percent)   1.80%gnk_PercentageOfSharesInPostEmergenceCommonStockOutstanding
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
           
Volatility rate ( as a percent)       43.91%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Volatility rate term       6 years        
Risk-free interest rate ( as a percent)       1.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Dividend rate ( as a percent)       0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Percentage of warrant vest for anniversaries of the grant date       33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Amortization                
Number of anniversaries in which award vests       3 years        
2014 MIP Plan | MIP Warrants                
Number of Shares                
Balance at the beginning of the period (in shares)               8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Balance at the end of the period (in shares) 8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
            8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Weighted Average Exercise price                
Outstanding at the beginning of the period (in dollars per share)               $ 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Outstanding at the end of the period (in dollars per share) 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
            $ 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Weighted Average Grant Date Price                
Balance at the beginning of the period (in dollars per share)               $ 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Balance at the end of the period (in dollars per share) 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
            $ 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Unrecognized compensation cost 32,847us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Amortization                
Remainder of 2015 17,742us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
2016 11,496us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
2017 3,609us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
2014 MIP Plan | MIP Warrants | $25.91 Warrants                
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Aggregate number of shares of common stock available for awards       2,380,664us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Strike price (in dollars per share)       25.91us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Fair value of warrant (in dollars per share)       7.22gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
2014 MIP Plan | MIP Warrants | $28.73 Warrants                
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Aggregate number of shares of common stock available for awards       2,467,009us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Strike price (in dollars per share)       28.73us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Fair value of warrant (in dollars per share)       6.63gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
2014 MIP Plan | MIP Warrants | $34.19 Warrants                
Unrecognized compensation cost related to nonvested stock awards [Abstract]                
Aggregate number of shares of common stock available for awards       3,709,788us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Strike price (in dollars per share)       34.19us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
       
Fair value of warrant (in dollars per share)       5.63gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember