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LEGAL PROCEEDINGS (Details) (USD $) In Thousands, unless otherwise specified	Apr. 03, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Aug. 20, 2010
Predecessor
Line of Credit Facility
Cash collateralized bank guarantee	$ 900gnk_CashCollateralizedBankGuarantee / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
$253 Million Term Loan Facility
Line of Credit Facility
Face amount of term loan facility		253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember	253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember
$253 Million Term Loan Facility | Predecessor
Line of Credit Facility
Face amount of term loan facility				$ 253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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

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

X

- 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

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

X

- Details

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

X

- Details

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