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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Voyage expense recognition
Net (gain) loss on purchase and sale of bunker fuel	$ 1,453gnk_GainLossOnPurchaseAndSaleOfBunkerFuel
Impairment of long-lived assets
Impairment of vessel assets	35,396us-gaap_AssetImpairmentCharges
Predecessor
Voyage expense recognition
Net (gain) loss on purchase and sale of bunker fuel		$ (66)gnk_GainLossOnPurchaseAndSaleOfBunkerFuel / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition

Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

+ Details

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