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GENERAL INFORMATION (Details 2)	Mar. 31, 2015 item
Genco Reliance Limited | Genco Reliance
Vessels
Capacity of vessels	29,952gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoRelianceLimitedMember / gnk_VesselsByNameAxis = gnk_GencoRelianceMember
Genco Vigour Limited | Genco Vigour
Vessels
Capacity of vessels	73,941gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoVigourLimitedMember / gnk_VesselsByNameAxis = gnk_GencoVigourMember
Genco Explorer Limited | Genco Explorer
Vessels
Capacity of vessels	29,952gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoExplorerLimitedMember / gnk_VesselsByNameAxis = gnk_GencoExplorerMember
Genco Carrier Limited | Genco Carrier
Vessels
Capacity of vessels	47,180gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoCarrierLimitedMember / gnk_VesselsByNameAxis = gnk_GencoCarrierMember
Genco Sugar Limited | Genco Sugar
Vessels
Capacity of vessels	29,952gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoSugarLimitedMember / gnk_VesselsByNameAxis = gnk_GencoSugarMember
Genco Pioneer Limited | Genco Pioneer
Vessels
Capacity of vessels	29,952gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoPioneerLimitedMember / gnk_VesselsByNameAxis = gnk_GencoPioneerMember
Genco Progress Limited | Genco Progress
Vessels
Capacity of vessels	29,952gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoProgressLimitedMember / gnk_VesselsByNameAxis = gnk_GencoProgressMember
Genco Wisdom Limited | Genco Wisdom
Vessels
Capacity of vessels	47,180gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoWisdomLimitedMember / gnk_VesselsByNameAxis = gnk_GencoWisdomMember
Genco Success Limited | Genco Success
Vessels
Capacity of vessels	47,186gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoSuccessLimitedMember / gnk_VesselsByNameAxis = gnk_GencoSuccessMember
Genco Beauty Limited | Genco Beauty
Vessels
Capacity of vessels	73,941gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoBeautyLimitedMember / gnk_VesselsByNameAxis = gnk_GencoBeautyMember
Genco Knight Limited | Genco Knight
Vessels
Capacity of vessels	73,941gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoKnightLimitedMember / gnk_VesselsByNameAxis = gnk_GencoKnightMember
Genco Leader Limited | Genco Leader
Vessels
Capacity of vessels	73,941gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoLeaderLimitedMember / gnk_VesselsByNameAxis = gnk_GencoLeaderMember
Genco Marine Limited | Genco Marine
Vessels
Capacity of vessels	45,222gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoMarineLimitedMember / gnk_VesselsByNameAxis = gnk_GencoMarineMember
Genco Prosperity Limited | Genco Prosperity
Vessels
Capacity of vessels	47,180gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoProsperityLimitedMember / gnk_VesselsByNameAxis = gnk_GencoProsperityMember
Genco Muse Limited | Genco Muse
Vessels
Capacity of vessels	48,913gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoMuseLimitedMember / gnk_VesselsByNameAxis = gnk_GencoMuseMember
Genco Acheron Limited | Genco Acheron
Vessels
Capacity of vessels	72,495gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoAcheronLimitedMember / gnk_VesselsByNameAxis = gnk_GencoAcheronMember
Genco Surprise Limited | Genco Surprise
Vessels
Capacity of vessels	72,495gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoSurpriseLimitedMember / gnk_VesselsByNameAxis = gnk_GencoSurpriseMember
Genco Augustus Limited | Genco Augustus
Vessels
Capacity of vessels	180,151gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoAugustusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoAugustusMember
Genco Tiberius Limited | Genco Tiberius
Vessels
Capacity of vessels	175,874gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoTiberiusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoTiberiusMember
Genco London Limited | Genco London
Vessels
Capacity of vessels	177,833gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoLondonLimitedMember / gnk_VesselsByNameAxis = gnk_GencoLondonMember
Genco Titus Limited | Genco Titus
Vessels
Capacity of vessels	177,729gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoTitusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoTitusMember
Genco Challenger Limited | Genco Challenger
Vessels
Capacity of vessels	28,428gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoChallengerLimitedMember / gnk_VesselsByNameAxis = gnk_GencoChallengerMember
Genco Charger Limited | Genco Charger
Vessels
Capacity of vessels	28,398gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoChargerLimitedMember / gnk_VesselsByNameAxis = gnk_GencoChargerMember
Genco Warrior Limited | Genco Warrior
Vessels
Capacity of vessels	55,435gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoWarriorLimitedMember / gnk_VesselsByNameAxis = gnk_GencoWarriorMember
Genco Predator Limited | Genco Predator
Vessels
Capacity of vessels	55,407gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoPredatorLimitedMember / gnk_VesselsByNameAxis = gnk_GencoPredatorMember
Genco Hunter Limited | Genco Hunter
Vessels
Capacity of vessels	58,729gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoHunterLimitedMember / gnk_VesselsByNameAxis = gnk_GencoHunterMember
Genco Champion Limited | Genco Champion
Vessels
Capacity of vessels	28,445gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoChampionLimitedMember / gnk_VesselsByNameAxis = gnk_GencoChampionMember
Genco Constantine Limited | Genco Constantine
Vessels
Capacity of vessels	180,183gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoConstantineLimitedMember / gnk_VesselsByNameAxis = gnk_GencoConstantineMember
Genco Raptor LLC | Genco Raptor
Vessels
Capacity of vessels	76,499gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoRaptorLLCMember / gnk_VesselsByNameAxis = gnk_GencoRaptorMember
Genco Cavalier LLC | Genco Cavalier
Vessels
Capacity of vessels	53,617gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoCavalierLLCMember / gnk_VesselsByNameAxis = gnk_GencoCavalierMember
Genco Thunder LLC | Genco Thunder
Vessels
Capacity of vessels	76,588gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoThunderLLCMember / gnk_VesselsByNameAxis = gnk_GencoThunderMember
Genco Hadrian Limited | Genco Hadrian
Vessels
Capacity of vessels	169,694gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoHadrianLimitedMember / gnk_VesselsByNameAxis = gnk_GencoHadrianMember
Genco Commodus Limited | Genco Commodus
Vessels
Capacity of vessels	169,025gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoCommodusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoCommodusMember
Genco Maximus Limited | Genco Maximus
Vessels
Capacity of vessels	169,025gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoMaximusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoMaximusMember
Genco Claudius Limited | Genco Claudius
Vessels
Capacity of vessels	169,025gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoClaudiusLimitedMember / gnk_VesselsByNameAxis = gnk_GencoClaudiusMember
Genco Bay Limited | Genco Bay
Vessels
Capacity of vessels	34,296gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoBayLimitedMember / gnk_VesselsByNameAxis = gnk_GencoBayMember
Genco Ocean Limited | Genco Ocean
Vessels
Capacity of vessels	34,409gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoOceanLimitedMember / gnk_VesselsByNameAxis = gnk_GencoOceanMember
Genco Avra Limited | Genco Avra
Vessels
Capacity of vessels	34,391gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoAvraLimitedMember / gnk_VesselsByNameAxis = gnk_GencoAvraMember
Genco Mare Limited | Genco Mare
Vessels
Capacity of vessels	34,428gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoMareLimitedMember / gnk_VesselsByNameAxis = gnk_GencoMareMember
Genco Spirit Limited | Genco Spirit
Vessels
Capacity of vessels	34,432gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoSpiritLimitedMember / gnk_VesselsByNameAxis = gnk_GencoSpiritMember
Genco Aquitaine Limited | Genco Aquitaine
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoAquitaineLimitedMember / gnk_VesselsByNameAxis = gnk_GencoAquitaineMember
Genco Ardennes Limited | Genco Ardennes
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoArdennesLimitedMember / gnk_VesselsByNameAxis = gnk_GencoArdennesMember
Genco Auvergne Limited | Genco Auvergne
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoAuvergneLimitedMember / gnk_VesselsByNameAxis = gnk_GencoAuvergneMember
Genco Bourgogne Limited | Genco Bourgogne
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoBourgogneLimitedMember / gnk_VesselsByNameAxis = gnk_GencoBourgogneMember
Genco Brittany Limited | Genco Brittany
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoBrittanyLimitedMember / gnk_VesselsByNameAxis = gnk_GencoBrittanyMember
Genco Languedoc Limited | Genco Languedoc
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoLanguedocLimitedMember / gnk_VesselsByNameAxis = gnk_GencoLanguedocMember
Genco Loire Limited | Genco Loire
Vessels
Capacity of vessels	53,416gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoLoireLimitedMember / gnk_VesselsByNameAxis = gnk_GencoLoireMember
Genco Lorraine Limited | Genco Lorraine
Vessels
Capacity of vessels	53,416gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoLorraineLimitedMember / gnk_VesselsByNameAxis = gnk_GencoLorraineMember
Genco Normandy Limited | Genco Normandy
Vessels
Capacity of vessels	53,596gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoNormandyLimitedMember / gnk_VesselsByNameAxis = gnk_GencoNormandyMember
Genco Picardy Limited | Genco Picardy
Vessels
Capacity of vessels	55,257gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoPicardyLimitedMember / gnk_VesselsByNameAxis = gnk_GencoPicardyMember
Genco Provence Limited | Genco Provence
Vessels
Capacity of vessels	55,317gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoProvenceLimitedMember / gnk_VesselsByNameAxis = gnk_GencoProvenceMember
Genco Pyrenees Limited | Genco Pyrenees
Vessels
Capacity of vessels	57,981gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoPyreneesLimitedMember / gnk_VesselsByNameAxis = gnk_GencoPyreneesMember
Genco Rhone Limited | Genco Rhone
Vessels
Capacity of vessels	58,018gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_GencoRhoneLimitedMember / gnk_VesselsByNameAxis = gnk_GencoRhoneMember
Baltic Leopard Limited | Baltic Leopard
Vessels
Capacity of vessels	53,447gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticLeopardLimitedMember / gnk_VesselsByNameAxis = gnk_BalticLeopardMember
Baltic Panther Limited | Baltic Panther
Vessels
Capacity of vessels	53,351gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticPantherLimitedMember / gnk_VesselsByNameAxis = gnk_BalticPantherMember
Baltic Cougar Limited | Baltic Cougar
Vessels
Capacity of vessels	53,432gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticCougarLimitedMember / gnk_VesselsByNameAxis = gnk_BalticCougarMember
Baltic Jaguar Limited | Baltic Jaguar
Vessels
Capacity of vessels	53,474gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticJaguarLimitedMember / gnk_VesselsByNameAxis = gnk_BalticJaguarMember
Baltic Bear Limited | Baltic Bear
Vessels
Capacity of vessels	177,717gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticBearLimitedMember / gnk_VesselsByNameAxis = gnk_BalticBearMember
Baltic Wolf Limited | Baltic Wolf
Vessels
Capacity of vessels	177,752gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticWolfLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWolfMember
Baltic Wind Limited | Baltic Wind
Vessels
Capacity of vessels	34,409gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticWindLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWindMember
Baltic Cove Limited | Baltic Cove
Vessels
Capacity of vessels	34,403gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticCoveLimitedMember / gnk_VesselsByNameAxis = gnk_BalticCoveMember
Baltic Breeze Limited | Baltic Breeze
Vessels
Capacity of vessels	34,386gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticBreezeLimitedMember / gnk_VesselsByNameAxis = gnk_BalticBreezeMember
Baltic Fox Limited | Baltic Fox
Vessels
Capacity of vessels	31,883gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticFoxLimitedMember / gnk_VesselsByNameAxis = gnk_BalticFoxMember
Baltic Hare Limited | Baltic Hare
Vessels
Capacity of vessels	31,887gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticHareLimitedMember / gnk_VesselsByNameAxis = gnk_BalticHareMember
Baltic Lion Limited | Baltic Lion
Vessels
Capacity of vessels	179,185gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticLionLimitedMember / gnk_VesselsByNameAxis = gnk_BalticLionMember
Baltic Tiger Limited | Baltic Tiger
Vessels
Capacity of vessels	179,185gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticTigerLimitedMember / gnk_VesselsByNameAxis = gnk_BalticTigerMember
Baltic Hornet Limited | Baltic Hornet
Vessels
Capacity of vessels	63,574gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticHornetLimitedMember / gnk_VesselsByNameAxis = gnk_BalticHornetMember
Baltic Wasp Limited | Baltic Wasp
Vessels
Capacity of vessels	63,389gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticWaspLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Baltic Scorpion Limited | Baltic Scorpion
Vessels
Capacity of vessels	64,000gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticScorpionLimitedMember / gnk_VesselsByNameAxis = gnk_BalticScorpionMember
Baltic Mantis Limited | Baltic Mantis
Vessels
Capacity of vessels	64,000gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticMantisLimitedMember / gnk_VesselsByNameAxis = gnk_BalticMantisMember

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