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GENERAL INFORMATION (Details 4) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Feb. 28, 2012
Dec. 31, 2012
Nov. 18, 2013
Sep. 25, 2013
May 28, 2013
Dec. 31, 2013
General information              
Issuance of common stock (in shares) 131,017us-gaap_StockIssuedDuringPeriodSharesNewIssues            
Number of shares owned by related party (in shares) 61,541,389us-gaap_CommonStockSharesIssued            
MEP              
General information              
Technical services fee per ship per day 750gnk_TechnicalServicesFeeRevenuePerShipPerDay
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gnk_MaritimeEquityPartnersLlcMember
           
Initial term of provision of technical service 1 year            
Notice period for cancellation of provision of technical services 60 days            
Period for termination fee upon change of control 1 year            
Notice period for cancellation of provision of technical services by company 60 days            
Genco Investment LLC | Baltic Trading Limited              
General information              
Ownership interest held (as a percent) 10.85%gnk_PercentageOfOwnershipInterestHeldInSubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
           
Aggregate voting power held (as a percent) 64.60%gnk_PercentageOfVotingInterestHeldInSubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
           
Genco Investment LLC | Baltic Trading Limited | Minimum              
General information              
Ownership interest held (as a percent) 10.00%gnk_PercentageOfOwnershipInterestHeldInSubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Genco Investment LLC | Baltic Trading Limited | Class B stock              
General information              
Number of shares owned by Genco Investment LLC (in shares) 6,356,471us-gaap_InvestmentsInAndAdvancesToAffiliatesBalanceShares
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
           
Percentage of additional shares to be received by Genco Investment LLC (as a percent) 2.00%gnk_CommonStockAdditionalSharesToBeReceivedAsPercentageOfCommonSharesToBeIssuedBySubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
           
Predecessor              
General information              
Issuance of common stock (in shares)   7,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
7,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Offering price (in dollars per share)   $ 7.10us-gaap_EquityIssuancePerShareAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Net proceeds after deducting underwriters' fees and expenses   49,874,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
49,874,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Number of shares owned by related party (in shares)             44,449,407us-gaap_CommonStockSharesIssued
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Baltic Trading Limited              
General information              
Issuance of common stock (in shares)       12,650,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
13,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
6,419,217us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Offering price (in dollars per share)       $ 4.60us-gaap_EquityIssuancePerShareAmount
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 4.60us-gaap_EquityIssuancePerShareAmount
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 3.60us-gaap_EquityIssuancePerShareAmount
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net proceeds after deducting underwriters' fees and expenses       $ 55,125,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 59,474,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 21,564,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Baltic Trading Limited | Class B stock              
General information              
Issuance of common stock (in shares)       253,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
276,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
128,383us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Percentage of additional shares received from subsidiary (as a percent)       2.00%gnk_CommonStockAdditionalSharesReceivedAsPercentageOfCommonSharesIssuedBySubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2.00%gnk_CommonStockAdditionalSharesReceivedAsPercentageOfCommonSharesIssuedBySubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2.00%gnk_CommonStockAdditionalSharesReceivedAsPercentageOfCommonSharesIssuedBySubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Genco Investment LLC | Baltic Trading Limited              
General information              
Ownership interest held (as a percent)             11.05%gnk_PercentageOfOwnershipInterestHeldInSubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Aggregate voting power held (as a percent)             65.08%gnk_PercentageOfVotingInterestHeldInSubsidiary
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Genco Investment LLC | Baltic Trading Limited | Class B stock              
General information              
Number of shares owned by Genco Investment LLC (in shares)             6,356,471us-gaap_InvestmentsInAndAdvancesToAffiliatesBalanceShares
/ invest_InvestmentIssuerAxis
= gnk_BalticTradingLimitedMember
/ dei_LegalEntityAxis
= gnk_GencoInvestmentLlcMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember