This element represents the fair value of each warrant upon emergence from bankruptcy.

No definition available.

Name:	gnk_FairValueOfWarrant
Namespace Prefix:	gnk_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of tiers of Management Incentive Plan ("MIP") Warrants.

+ References

No definition available.

+ Details

Name:	gnk_NumberOfTiersOfManagementIncentivePlanWarrants
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of tranches

+ References

No definition available.

+ Details

Name:	gnk_NumberOfTranches
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of share-based awards outstanding other than options.

+ References

No definition available.

+ Details

Name:	gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_PlanNameAxis=gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=gnk_ManagementIncentivePlanWarrantsIssueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=gnk_MIPWarrantsTierOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=gnk_MIPWarrantsTierTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=gnk_MIPWarrantsTierThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCK-BASED COMPENSATION - 2014 MIP (Details) - 2014 MIP Plan $ / shares in Units, $ in Thousands	Aug. 07, 2014 USD ($) tranche $ / shares shares	Jul. 09, 2014 item shares	Feb. 25, 2020 $ / shares
Stock Awards
Aggregate number of shares of common stock available for awards \| shares		966,806
Warrants
Stock Awards
Number of tiers of MIP Warrants \| item		3
Number of tranches \| tranche	3
Aggregate fair value of awards upon issuance \| $	$ 54,436
Warrants \| $240.89 Warrants
Stock Awards
Aggregate number of shares of common stock available for awards \| shares	238,066
Fair value of warrant (in dollars per share)	$ 7.22
Exercise price per share, as adjusted by dividends			$ 240.89221
Warrants \| $267.11 Warrants
Stock Awards
Aggregate number of shares of common stock available for awards \| shares	246,701
Fair value of warrant (in dollars per share)	$ 6.63
Exercise price per share, as adjusted by dividends			267.11051
Warrants \| $317.87 Warrants
Stock Awards
Aggregate number of shares of common stock available for awards \| shares	370,979
Fair value of warrant (in dollars per share)	$ 5.63
Exercise price per share, as adjusted by dividends			$ 317.87359