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VESSEL ACQUISITIONS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
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Dec. 31, 2014 | Dec. 30, 2014 | Jul. 09, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 03, 2013 | Oct. 31, 2013 item | Aug. 30, 2013 | Jul. 02, 2013 item | Nov. 13, 2013 item
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Deposits on vessels | $ 25,593 us-gaap_DepositsAssets |  |  |  |  |  |  |  |  |
Amortization of time charters acquired | 450 us-gaap_RecognitionOfDeferredRevenue |  |  |  |  |  |  |  |  |
Time charters acquired | 0 gnk_FairMarketValueOfTimeChartersAcquired |  |  |  |  |  |  |  |  |
Genco Bourgogne, Genco Muse, and Genco Spirit |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Time charters acquired | 450 gnk_FairMarketValueOfTimeChartersAcquiredAssetsCurrent / gnk_VesselsByNameAxis = gnk_GencoBourgogneGencoMuseAndGencoSpiritMember |  |  |  |  |  |  |  |  |
Baltic Wasp |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Final payment for vessel |  | 19,645 gnk_PaymentsHeldInEscrowAccount / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |  |  |  |  |  |  |
Baltic Trading Limited |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Capitalized interest associated with new building contracts | 400 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember |  |  |  |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Deposits on vessels |  |  |  | 1,013 us-gaap_DepositsAssets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Amortization of time charters acquired |  |  | (68)us-gaap_RecognitionOfDeferredRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (334)us-gaap_RecognitionOfDeferredRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (746)us-gaap_RecognitionOfDeferredRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Time charters acquired |  |  |  | 84 gnk_FairMarketValueOfTimeChartersAcquired / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Predecessor | Baltic Trading Limited |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Capitalized interest associated with new building contracts |  |  | 295 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_InterestCostsCapitalized / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Predecessor | Agreement to Purchase Capesize Drybulk Vessels | Purchase agreement with SK Shipping Co LTD | Baltic Trading Limited |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Number of vessels purchased |  |  |  |  |  |  | 2 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseCapesizeDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_PurchaseAgreementWithSkShippingCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Aggregate purchase price |  |  |  |  |  |  | 103,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / gnk_AgreementAxis = gnk_AgreementToPurchaseCapesizeDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_PurchaseAgreementWithSkShippingCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Face amount of term loan facility |  |  |  |  |  | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gnk_AgreementAxis = gnk_AgreementToPurchaseCapesizeDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_PurchaseAgreementWithSkShippingCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |
Predecessor | Handysize Vessel purchase | Subsidiaries of Clipper Group | Baltic Trading Limited |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |
Number of vessels purchased |  |  |  |  |  |  |  |  | 2 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / gnk_AgreementAxis = gnk_SubsidiariesOfClipperGroupMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_HandysizeVesselPurchaseMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Aggregate purchase price |  |  |  |  |  |  |  |  | 41,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / gnk_AgreementAxis = gnk_SubsidiariesOfClipperGroupMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_HandysizeVesselPurchaseMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Face amount of term loan facility |  |  |  |  |  |  |  | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / gnk_AgreementAxis = gnk_SubsidiariesOfClipperGroupMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_HandysizeVesselPurchaseMember / 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 |  |  |  |  |  |  |  |  |  | 2 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Aggregate purchase price |  |  |  |  |  |  |  |  |  | 112,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Purchase price per vessel |  |  |  |  |  |  |  |  |  | $ 28,000 gnk_PurchasePricePerVessel / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of vessels purchased under option to be acquired per purchase agreement |  |  |  |  |  |  |  |  |  | 2 gnk_NumberOfVesselsPurchasedUnderOptionToBeAcquiredPerPurchaseAgreement / gnk_AgreementAxis = gnk_AgreementToPurchaseUltramaxDrybulkVesselsMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gnk_YangfanGroupCoLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Capacity of vessels |  |  |  |  |  |  |  |  |  | 64,000 gnk_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 |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement |  |  |  |  |  |  |  |  |  | 4 gnk_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

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