Name:	gnk_DebtorReorganizationItemsFreshStartReportingAdjustments
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of net gain (loss) on debt and equity discharge and issuances, reported as a reorganization item.

No definition available.

Name:	gnk_DebtorReorganizationItemsGainLossOnDebtAndEquityDischargeAndIssuances
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of reorganization items related to trustee fees related to the entities in bankruptcy.

No definition available.

Name:	gnk_DebtorReorganizationItemsTrusteeFees
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the non-cash reorganization items and fresh start accounting adjustments, net.

No definition available.

Name:	gnk_ReorganizationItemsAndFreshStartAccountingAdjustmentsNet
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the change in future cash outflow for professional fees that have occurred.

No definition available.

Name:	gnk_ReorganizationProfessionalAndTrusteeFeesNet
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	gnk_ReorganizationUnderChapter11OfUSBankruptcyCodeDisclosureLineItems
Namespace Prefix:	gnk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764

Name:	us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

Name:	us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Total amount of reorganization items.