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VESSEL ACQUISITIONS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Nov. 13, 2013
item
VESSEL ACQUISITIONS AND DISPOSITIONS          
Deposits on vessels $ 19,237us-gaap_DepositsAssets     $ 25,593us-gaap_DepositsAssets  
Baltic Trading Limited          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Capitalized interest associated with new building contracts 124us-gaap_InterestCostsCapitalized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
       
Baltic Trading Limited | Baltic Wasp          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Final payment for vessel   19,645gnk_PaymentsHeldInEscrowAccount
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ gnk_VesselsByNameAxis
= gnk_BalticWaspMember
     
Predecessor          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Amortization of time charters acquired     49us-gaap_RecognitionOfDeferredRevenue
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor | Baltic Trading Limited          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Capitalized interest associated with new building contracts     98us-gaap_InterestCostsCapitalized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor | Yangfan Group Co., LTD | Agreement to Purchase Ultramax Drybulk Vessels | Baltic Trading Limited          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Number of vessels purchased         2gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Total purchase price per vessel         28,000gnk_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceedsPerVessel
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Capacity of vessels         64,000gnk_CapacityOfVesselsInDeadweightTonnage
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Yangfan Group Co., LTD | Agreement to Purchase Ultramax Drybulk Vessels | Baltic Trading Limited | Maximum          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Aggregate purchase price         112,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Number of vessels purchased under option to be acquired per purchase agreement         2gnk_NumberOfVesselsPurchasedUnderOptionToBeAcquiredPerPurchaseAgreement
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Number of vessels committed to be acquired under purchase agreement         4gnk_NumberOfVesselsCommittedToBeAcquiredUnderPurchaseAgreement
/ gnk_AgreementAxis
= gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gnk_YangfanGroupCoLtdMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Baltic Trading $148 Million Credit Facility          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Face amount of term loan facility $ 148,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityFourMember
    $ 148,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityFourMember
 
Baltic Trading $148 Million Credit Facility | Forecast          
VESSEL ACQUISITIONS AND DISPOSITIONS          
Number of vessels purchased by using term loan finance 2gnk_NumberOfAssetsAcquiredByFinancingThroughTermLoans
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityFourMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember