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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
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Prepaid expenses and other current assets |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Cash collateralized bank guarantee | $ 900 gnk_CashCollateralizedBankGuarantee / us-gaap_IncomeStatementLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember |  |  |  |
Predecessor |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Cash collateralized bank guarantee |  | 900 gnk_CashCollateralizedBankGuarantee / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
$253 Million Term Loan Facility |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Face amount of term loan facility | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |
$253 Million Term Loan Facility | Predecessor |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Face amount of term loan facility |  |  | $ 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- 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

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

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- 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

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

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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