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GENERAL INFORMATION (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
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	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	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	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

X

- Definition

Represents the period for termination fee to be paid by the services receiver in case of cancellation of provision of services upon change of control of the reporting entity.

+ References

No definition available.

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- Definition

Represents the additional shares that the entity is entitled to receive as a percentage of the number of common shares to be issued in the future by subsidiary if the entity directly or indirectly holds the minimum threshold percentage of the aggregate number of outstanding shares of the subsidiary.

+ References

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- Definition

Represents the notice period for cancellation of provision of technical services by the reporting entity at any time.

+ References

No definition available.

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- Definition

Represents the notice period for cancellation of provision of technical services by the service receiver upon change of control of the reporting entity.

+ References

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- Definition

Represents the ownership percentage held in the subsidiary.

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- Definition

Represents the aggregate voting power held in the subsidiary.

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- Definition

Represents the initial term of provision of technical service.

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- Definition

Represents the technical services fee revenue per ship per day for drybulk vessels which includes oversight of crew management, insurance, drydocking, ship operations and financial statement preparation, but do not include chartering services.

+ References

No definition available.

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- Definition

Number of shares of affiliates held for management investment companies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column B)

-URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column B

-Article 12

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