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FIXED ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
FIXED ASSETS
Total cost	$ 953us-gaap_PropertyPlantAndEquipmentGross		$ 820us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	170us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		119us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total	783us-gaap_PropertyPlantAndEquipmentNet		701us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization	19,410us-gaap_DepreciationDepletionAndAmortization
Predecessor
FIXED ASSETS
Depreciation and amortization		36,201us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Vessel Equipment
FIXED ASSETS
Total cost	349us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember		229us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MaritimeEquipmentMember
Furniture and Fixtures
FIXED ASSETS
Total cost	462us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		462us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Computer Equipment
FIXED ASSETS
Total cost	142us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember		129us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Detail of Fixed Assets, Excluding Vessels
FIXED ASSETS
Depreciation and amortization	51us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember
Detail of Fixed Assets, Excluding Vessels | Predecessor
FIXED ASSETS
Depreciation and amortization		$ 219us-gaap_DepreciationDepletionAndAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gnk_PropertyPlantAndEquipmentExcludingVesselsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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