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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 Segment Vessel | Dec. 31, 2012 Vessel | Dec. 31, 2011
Segment reporting [Abstract] |  |  |
Number of reportable segments | 2 |  |
Revenue and voyage expense recognition [Abstract] |  |  |
Net gain on purchase and sale of bunker fuel | $ 567 | $ 1,714 | $ 2,653
Number of vessels in vessel pools | 5 | 5 |
Other operating income [Abstract] |  |  |
Other operating income recorded | 121 | 265 | 527
Samsun [Member] |  |  |
Other operating income [Abstract] |  |  |
Other operating income recorded |  | 263 | 527
Number of installments due |  | 2 | 3
Baltic Trading Limited [Member] |  |  |
Revenue and voyage expense recognition [Abstract] |  |  |
Number of vessels in vessel pools | 4 |  |
Korea Line Corporation [Member] |  |  |
Other operating income [Abstract] |  |  |
Other operating income recorded | 21 | 2 |
Number of shares received related to the rehabilitation plan (in shares) | 3,355 |  |
KLC Rehabilitation Plan [Member] |  |  |
Other operating income [Abstract] |  |  |
Other operating income recorded | $ 100 |  |
Number of shares received related to the rehabilitation plan (in shares) | 3,355 |  |
Spot Market-Related Time Charter Agreement [Member] |  |  |
Revenue and voyage expense recognition [Abstract] |  |  |
Number of vessels under spot market-related time charters which include a profit-sharing element | 4 |  |
Floor price (in dollars per unit) | $ 9 |  |
Ceiling price (in dollars per unit) | $ 14 |  |
Allocation of excess profit sharing amount (in hundredths) | 50.00% |  |
Percentage of average of the daily rates of BHSI used to determine charter agreement rates (in hundredths) | 115.00% |  |

X
- Definition Represents the allocation of excess profit sharing amount, expressed as a percentage. + References No definition available. + Details
Name: | gnk_AllocationOfExcessProfitSharingAmountExpressedAsPercentage
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the daily ceiling rate of the charter agreement. + References No definition available. + Details
Name: | gnk_CharterAgreementDailyCeilingRate
Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the daily floor rate of the charter agreement. + References No definition available. + Details
Name: | gnk_CharterAgreementDailyFloorRate
Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer. + References No definition available. + Details
Name: | gnk_GainLossOnPurchaseAndSaleOfBunkerFuel
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of payment installments that are due. + References No definition available. + Details
Name: | gnk_NumberOfInstallmentsDue
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share received pursuant to the rehabilitation plan approved by the South Korean courts. + References No definition available. + Details
Name: | gnk_NumberOfSharesReceivedRelatedToRehabilitationPlan
Namespace Prefix: | gnk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of vessels that were in the vessel pool on a specified date. + References No definition available. + Details
Name: | gnk_NumberOfVesselsInVesselPool
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of vessels under spot market-related time charters, which include a profit-sharing element. + References No definition available. + Details
Name: | gnk_NumberOfVesselsUnderSpotMarketRelatedTimeChartersWhichIncludeProfitSharingElement
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation. + References No definition available. + Details
Name: | gnk_OtherOperatingIncomeRecorded
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percent of the average daily rates of index referenced on which charter agreement rates are based. + References No definition available. + Details
Name: | gnk_PercentageOfAverageDailyRatesOfIndexOnWhichCharterAgreementRatesAreBased
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | gnk_VoyageExpenseRecognitionAbstract
Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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