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LEGAL PROCEEDINGS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Apr. 03, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 20, 2010
Prepaid expenses and other current assets
Line of Credit Facility
Cash collateralized bank guarantee	$ 900gnk_CashCollateralizedBankGuarantee / us-gaap_IncomeStatementLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
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 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	$ 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_IncomeStatementLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
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: