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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details) $ / item in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item $ / item	Dec. 31, 2016 USD ($) item
Voyage expense recognition
Net gain (loss) on purchase and sale of bunker fuel and net realizable value adjustments	$ 3,000	$ 2,021	$ (4,920)
Number of vessels in vessel pools | item	0	0
Other operating income	$ 0	$ 0	960
Samsun | Bankruptcy settlement due
Voyage expense recognition
Other operating income			$ 934
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 | item	0	6	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

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=gnk_SamsunLogixCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GainContingenciesByNatureAxis=gnk_BankruptcySettlementDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gnk_AgreementAxis=gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: