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LEGAL PROCEEDINGS (Details) $ in Thousands	Mar. 28, 2014 item	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Apr. 03, 2014 USD ($)	Aug. 20, 2010 USD ($)
Predecessor
Line of Credit Facility
Number of vessels in dispute | item	1
Cash collateralized bank guarantee					$ 900
Secured Debt | $253 Million Term Loan Facility
Line of Credit Facility
Face amount of term loan facility		$ 253,000	$ 253,000
Secured Debt | $253 Million Term Loan Facility | Predecessor
Line of Credit Facility
Face amount of term loan facility				$ 253,000		$ 253,000

X

- Definition

Cash collateralized bank guarantee entered into in order for the Company to release a vessel from arrest. The cash will remain in an escrow account until the arbitration related to the case is completed.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of vessels in a legal dispute.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.19(b),22(b))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 19, 22



-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: