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INTEREST RATE SWAP AGREEMENTS (Details) (Predecessor, USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 30, 2014	Mar. 31, 2014
Interest rate swaps designated as cash flow hedges
Number of interest rate swap agreements outstanding		1us-gaap_NumberOfInterestRateDerivativesHeld
Notional amount outstanding		106,233invest_DerivativeNotionalAmount
Chapter 11 | DNB Bank ASA
Interest rate swaps designated as cash flow hedges
Secured claim issued with the Bankruptcy Court	$ 5,622us-gaap_BankruptcyClaimsAmountOfClaimsFiled / dei_LegalEntityAxis = gnk_DNBBankASAMember / gnk_ReorganizationAxis = gnk_Chapter11OfUSBankruptcyCodeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
2007 Credit Facility
Interest rate swaps designated as cash flow hedges
Term of interest periods when Company is in default under covenants of 2007 Credit Facility		1 month

X

- Definition

The term of interest periods when the Company is in default under the covenants of its 2007 Credit Facility.

+ References

No definition available.

+ Details

Name:	gnk_TermOfInterestPeriodsWhenInDefaultUnderCovenantsOfCreditFacility
Namespace Prefix:	gnk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of bankruptcy claim filed with bankruptcy court.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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