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GENERAL INFORMATION- Other (Details) - MEP |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jan. 31, 2016 USD ($) item | Sep. 30, 2016 USD ($) item | Sep. 30, 2015
General information |  |  |  |  |
Technical services fee per ship per day | $ 650 | $ 750 |  |  |
Initial term of provision of technical service |  |  |  |  | 1 year
Payment of technical services fees in arrears |  | $ 2,178,000 | $ 261,000 |  |
Number of related party vessels sold | item |  |  | 5 | 7 |
Termination fee due and repaid |  |  | $ 296,000 | $ 830,000 |

X
- Definition Amount of termination fee, that has become due because of cancellation of provision of technical services by the service receiver upon sale of the vessel. + References No definition available. + Details
Name: | gnk_CancellationOfProvisionOfTechnicalServicesByServiceReceiverUponChangeOfControlTerminationFeeDue
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | gnk_GeneralInformationLineItems
Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of vessels sold by a related party. + References No definition available. + Details
Name: | gnk_NumberOfRelatedPartyVesselsSold
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the payment of technical services fees in arrears by related party. + References No definition available. + Details
Name: | gnk_PaymentOfTechnicalFeesInArrears
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the initial term of provision of technical service. + References No definition available. + Details
Name: | gnk_TechnicalServiceProvisionPeriod
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the technical services fee revenue per ship per day for drybulk vessels which includes oversight of crew management, insurance, drydocking, ship operations and financial statement preparation, but do not include chartering services. + References No definition available. + Details
Name: | gnk_TechnicalServicesFeeRevenuePerShipPerDay
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gnk_MaritimeEquityPartnersLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |