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RELATED PARTY TRANSACTIONS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jul. 09, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction
Service revenues	$ 1,584us-gaap_SalesRevenueServicesNet
General Maritime Corporation
Related Party Transaction
Amount invoiced for services performed and expenses paid	12gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember
Expenses incurred from transactions with related party	53us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember
Amount due to the related party	41us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember
Constantine Georgiopoulos
Related Party Transaction
Expenses incurred from transactions with related party	11us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
Amount due to the related party	9us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
Aegean Marine Petroleum Network Inc.
Related Party Transaction
Expenses incurred from transactions with related party	790us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember
Amount due to the related party	267us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember
MEP
Related Party Transaction
Amount invoiced for services performed and expenses paid	1,618gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember
Amount due to the entity from a related party	10us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember
Service revenues	1,584us-gaap_SalesRevenueServicesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember
Predecessor
Related Party Transaction
Service revenues		1,701us-gaap_SalesRevenueServicesNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	3,285us-gaap_SalesRevenueServicesNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	3,294us-gaap_SalesRevenueServicesNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | General Maritime Corporation
Related Party Transaction
Amount invoiced for services performed and expenses paid		72gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	145gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	175gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Expenses incurred from transactions with related party		49us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	133us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	87us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Amount due to the related party			16us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_GeneralMaritimeCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Constantine Georgiopoulos
Related Party Transaction
Expenses incurred from transactions with related party		3us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	48us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	11us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Amount due to the related party			25us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Aegean Marine Petroleum Network Inc.
Related Party Transaction
Expenses incurred from transactions with related party		1,087us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	1,521us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	1,517us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Amount due to the related party			263us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_AegeanMarinePetroleumNetworkIncMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | MEP
Related Party Transaction
Amount invoiced for services performed and expenses paid		1,743gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	3,430gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	3,396gnk_RelatedPartyTransactionAmountInvoicedForServicesProvidedAndExpensesPaid / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Amount due to the entity from a related party			7us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Service revenues		$ 1,701us-gaap_SalesRevenueServicesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 3,285us-gaap_SalesRevenueServicesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 3,294us-gaap_SalesRevenueServicesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gnk_MaritimeEquityPartnersLlcMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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