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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) | 131,017 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |
Number of shares owned by related party (in shares) | 61,541,389 us-gaap_CommonStockSharesIssued |  |  |  |  |  |
MEP |  |  |  |  |  |  |
General information |  |  |  |  |  |  |
Technical services fee per ship per day | 750 gnk_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) | 6,356,471 us-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) |  | 7,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |
Offering price (in dollars per share) |  | $ 7.10 us-gaap_EquityIssuancePerShareAmount / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Net proceeds after deducting underwriters' fees and expenses |  | 49,874,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 49,874,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |
Number of shares owned by related party (in shares) |  |  |  |  |  |  | 44,449,407 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Baltic Trading Limited |  |  |  |  |  |  |
General information |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 12,650,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 13,800,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6,419,217 us-gaap_StockIssuedDuringPeriodSharesNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Offering price (in dollars per share) |  |  |  | $ 4.60 us-gaap_EquityIssuancePerShareAmount / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 4.60 us-gaap_EquityIssuancePerShareAmount / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 3.60 us-gaap_EquityIssuancePerShareAmount / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Net proceeds after deducting underwriters' fees and expenses |  |  |  | $ 55,125,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 59,474,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 21,564,000 us-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) |  |  |  | 253,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 276,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 128,383 us-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) |  |  |  |  |  |  | 6,356,471 us-gaap_InvestmentsInAndAdvancesToAffiliatesBalanceShares / invest_InvestmentIssuerAxis = gnk_BalticTradingLimitedMember / dei_LegalEntityAxis = gnk_GencoInvestmentLlcMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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