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v3.19.3.a.u2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details) $ / item in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item $ / item
Voyage expense recognition |  |  |
Net (loss) gain on purchase and sale of bunker fuel and net realizable value adjustments | $ | $ (829) | $ 3,000 | $ 2,021
Number of vessels in vessel pools | 0 | 0 |
Spot Market-Related Time Charter Agreement with Profit Sharing Element |  |  |
Voyage expense recognition |  |  |
Number of vessels under spot market-related time charters which include a profit-sharing element | 0 | 0 | 6
Floor price (in dollars per unit) | $ / item |  |  | 3
Allocation of excess profit sharing amount (as a percent) |  |  | 50.00%

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

X
- Details
Name: | gnk_AgreementAxis=gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |