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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Jul. 09, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Due from charterers, net |  |  |  |  |  |  |  |
Reserve against the due from charterers |  |  | $ 1,588 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,588 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 1,588 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |
Accrual related to estimated customer claims |  |  | 662 gnk_AccrualRelatedToEstimatedCustomerClaims | 662 gnk_AccrualRelatedToEstimatedCustomerClaims | 662 gnk_AccrualRelatedToEstimatedCustomerClaims |  |  |
Vessels, net |  |  |  |  |  |  |  |
Estimated scrap value (in dollars per lightweight ton) |  |  |  | 310 gnk_VesselsEstimatedScrapValue |  |  |  |
Estimated life of average scrap value of steel |  |  |  | 15 years |  |  |  |
Decrease in depreciation expense |  |  |  | 1,540 gnk_DecreaseInDepreciationExpenseAsResultOfIncreaseInEstimatedScrapValue |  |  |  |
Change to basic and diluted net loss per share as a result of decrease in depreciation |  |  |  | $ 0.03 gnk_IncreaseDecreaseInBasicAndDilutedNetIncomeLossPerShare |  |  |  |
Basic and diluted net loss per share if no change to estimated scrap value |  |  |  | $ (3.05)gnk_EarningsPerShareBasicAndDilutedIfNoChangeToScrapValue |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | 36,714 us-gaap_DepreciationDepletionAndAmortization |  |  |  |
Asset Impairment Charges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges |  |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |  |
Amortization expense for drydocking |  |  |  | 330 gnk_AmortizationExpenseOfDrydocking |  |  |  |
Goodwill |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 166,067 us-gaap_GoodwillImpairmentLoss |  |  |  |
Minimum |  |  |  |  |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance |  |  |  |  | 30 months |  |  |
Maximum |  |  |  |  |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance |  |  |  |  | 60 months |  |  |
Detail of Fixed Assets, Excluding Vessels |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | 119 us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember |  |  |  |
Furniture and Fixtures |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 5 years |  |  |
Vessel |  |  |  |  |  |  |  |
Vessels, net |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  | 25 years |  |  |
Depreciation expense |  |  |  | 36,265 gnk_DepreciationOfVessels / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember |  |  |  |
Vessel | Minimum |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 2 years |  |  |
Vessel | Maximum |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 15 years |  |  |
Computer Equipment |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 3 years |  |  |
Predecessor |  |  |  |  |  |  |  |
Due from charterers, net |  |  |  |  |  |  |  |
Reserve against the due from charterers |  |  |  |  |  |  | 632 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Accrual related to estimated customer claims |  |  |  |  |  |  | 536 gnk_AccrualRelatedToEstimatedCustomerClaims / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Fixed assets, net |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  | 75,952 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 140,743 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 139,063 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Asset Impairment Charges |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Deferred drydocking costs |  |  |  |  |  |  |  |
Amortization expense for drydocking |  |  |  |  |  | 3,738 gnk_AmortizationExpenseOfDrydocking / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 5,700 gnk_AmortizationExpenseOfDrydocking / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 5,064 gnk_AmortizationExpenseOfDrydocking / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Goodwill |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 166,067 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | Detail of Fixed Assets, Excluding Vessels |  |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  | 458 us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,481 us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 888 us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Vessel |  |  |  |  |  |  |  |
Vessels, net |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  | $ 71,756 gnk_DepreciationOfVessels / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 133,562 gnk_DepreciationOfVessels / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 133,111 gnk_DepreciationOfVessels / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Estimated scrap value (in dollars per lightweight ton) |  |  |  |  |  | 245 gnk_VesselsEstimatedScrapValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |

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