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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) item | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) item | Sep. 30, 2018 USD ($) | Dec. 31, 2018 item
Voyage expense recognition |  |  |  |  |
Net (loss) gain on purchase and sale of bunker fuel and net realizable value adjustments | $ (497) | $ 1,020 | $ (734) | $ 2,909 |
Charter hire expenses | $ 5,475 | $ 723 | $ 12,743 | $ 1,231 |
Number of vessels in vessel pools | item | 0 |  | 0 |  | 0

X
- Definition Represents the costs incurred for third-party vessels that are time chartered-in. + References No definition available. + Details
Name: | gnk_CharterHireExpense
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 and the lower of cost and net realizable value adjustment to re-value bunker fuel on a quarterly basis. + References No definition available. + Details
Name: | gnk_NetGainLossOnPurchaseAndSaleOfBunkerFuelAndLowerCostAndNetRealizableValueAdjustments
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
- References No definition available. + Details
Name: | gnk_VoyageExpenseRecognitionAbstract
Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration