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LEGAL PROCEEDINGS (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 $253 Million Term Loan Facility [Member] | Aug. 20, 2010 $253 Million Term Loan Facility [Member] | Mar. 28, 2014 Subsequent Event [Member]
--- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |
Cash collateralized bank guarantee |  |  |  | $ 900
Line of Credit Facility [Line Items] |  |  |  |
Face amount of term loan facility | $ 253,000 | $ 253,000 | $ 253,000 |

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

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

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