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LEGAL PROCEEDINGS - Claims and Complaints (Details) - complaint		1 Months Ended
	May 26, 2015	Apr. 30, 2015
LEGAL PROCEEDINGS
Number of claims filed		6
Number of complaints consolidated	6

X

- Definition

Represents the number of previous filed complaints consolidated and filed.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration