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GENERAL INFORMATION- Other (Details) - MEP |  |  | 1 Months Ended | 2 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jan. 31, 2016 USD ($) item | Sep. 30, 2015 USD ($) item | Aug. 31, 2016 item | Jun. 30, 2016
General information |  |  |  |  |  |
Technical services fee per ship per day | $ 650 | $ 750 |  |  |  |
Initial term of provision of technical service |  |  |  |  |  | 1 year
Notice period for cancellation of provision of technical services |  |  |  |  |  | 60 days
Period for termination fee upon change of control |  |  |  |  |  | 1 year
Notice period for cancellation of provision of technical services by company |  |  |  |  |  | 60 days
Payment of technical services fees in arrears |  | 2,178,000 | $ 261,000 |  |  |
Number of vessels sold | item |  |  | 5 | 5 | 5 |
Termination fee due |  | $ 296,000,000 |  | $ 296,000,000 |  |

X
- Definition Represents the period for termination fee to be paid by the services receiver in case of cancellation of provision of services upon change of control of the reporting entity. + References No definition available. + Details
Name: | gnk_CancellationOfProvisionOfTechnicalServicesByServiceReceiverUponChangeOfControlPeriodForTerminationFee
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of termination fee, that has become due because of cancellation of provision of technical services by the service receiver upon change in control. + 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 notice period for cancellation of provision of technical services by the reporting entity at any time. + References No definition available. + Details
Name: | gnk_NoticePeriodForCancellationOfProvisionOfTechnicalServicesByEntity
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the notice period for cancellation of provision of technical services by the service receiver upon change of control of the reporting entity. + References No definition available. + Details
Name: | gnk_NoticePeriodForCancellationOfProvisionOfTechnicalServicesByServiceReceiverUponChangeOfControl
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information pertaining to number of vessels sold by the entity. + References No definition available. + Details
Name: | gnk_NumberOfVesselsSold
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: |