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DEBT (Details 5) - Line of Credit facility - 2010 Baltic Trading Credit Facility - Range [Domain] $ in Thousands	Jan. 07, 2015 USD ($)	Aug. 29, 2013 USD ($) item	Nov. 30, 2010 USD ($)	Apr. 16, 2010 USD ($)
Line of Credit Facility
Payment of Credit Facility	$ 102,250
Predecessor
Line of Credit Facility
Maximum borrowing capacity		$ 110,000	$ 150,000	$ 100,000
Number of consecutive semi-annual reductions in total commitment | item		3
Amount of semi-annual reductions in maximum borrowing capacity through the maturity date		$ 5,000
Ratio of maximum facility amount to aggregate appraised value of vessels mortgaged (as a percent)		55.00%
Applicable margin over reference rate for condition two (as a percent)		3.35%
Predecessor | LIBOR
Line of Credit Facility
Reference rate		LIBOR
Applicable margin over reference rate for condition one (as a percent)		3.00%

X

- Definition

Applicable margin over reference rate if ratio of maximum facility amount to aggregate appraised value of vessels mortgaged is 55% or less.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Applicable margin over reference rate if ratio of maximum facility amount to aggregate appraised value of vessels mortgaged is above 55%.

+ References

No definition available.

+ Details

Name:	gnk_ApplicableMarginOverReferenceRateForConditionTwo
Namespace Prefix:	gnk_
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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of the semi-annual reductions in the maximum borrowing capacity which will occur through the maturity date of the line of credit facility.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of consecutive semi-annual reductions in maximum borrowing capacity under the line of credit facility.

+ References

No definition available.

+ Details

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

X

- Definition

Represents ratio of maximum facility amount to aggregate appraised value of vessels mortgaged.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
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Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.19(b),22(b))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 19, 22



-Article 5

+ Details

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

X

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 15



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Financing Activities



-URI http://asc.fasb.org/extlink&oid=6513228



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.4-08.(f))



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 08



-Paragraph f



-Article 4

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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X

- Details

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- Details

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X

- Details

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