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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands		3 Months Ended
	Jul. 17, 2015 segment	Mar. 31, 2016 USD ($) segment $ / item	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment reporting
Number of reportable segments | segment	2	1
Vessels, net
Estimated useful life		25 years
Depreciation expense		$ 19,134	$ 18,967
Estimated scrap value (in dollars per lightweight ton) | $ / item		310
Deferred revenue
Accrual related to estimated customer claims		$ 307		$ 498
Voyage expense recognition
Net loss on purchase and sale of bunker fuel and LCM adjustments		2,297	2,292
Impairment of vessel assets
Impairment of vessel assets		$ 1,685	$ 35,396

X

- Definition

Represents the accrual related to estimated customer claims.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the depreciation of vessels.

+ References

No definition available.

+ Details

Name:	gnk_DepreciationOfVessels
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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 and the lower of cost or market adjustment to re-value bunker fuel on a quarterly basis.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the estimated scrap value of vessels.

+ References

No definition available.

+ Details

Name:	gnk_VesselsEstimatedScrapValue
Namespace Prefix:	gnk_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the estimated useful life of vessels.

+ References

No definition available.

+ Details

Name:	gnk_VesselsEstimatedUsefulLife
Namespace Prefix:	gnk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	gnk_VoyageExpenseRecognitionAbstract
Namespace Prefix:	gnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

Reference 2: 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=56944662&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- References

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