Represents the allocation of excess profit sharing amount, expressed as a percentage.

No definition available.

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

- Definition

Represents the daily ceiling rate of the charter agreement.

+ References

No definition available.

+ Details

Name:	gnk_CharterAgreementDailyCeilingRate
Namespace Prefix:	gnk_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- 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

- Definition

The fair value of shares received in lieu of cash in the payment of a settlement.

+ References

No definition available.

+ Details

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

- 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.

+ References

No definition available.

+ Details

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

- Definition

Share received pursuant to the rehabilitation plan approved by the South Korean courts.

+ References

No definition available.

+ Details

Name:	gnk_NumberOfSharesReceivedRelatedToRehabilitationPlan
Namespace Prefix:	gnk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- Definition

Represents the percent of the average daily rates of index referenced on which charter agreement rates are based.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

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

- 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=26872669&loc=d3e20235-122688

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	gnk_AgreementAxis=gnk_Navig8BulkPoolMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2014 segment item	Jul. 09, 2014	Dec. 31, 2013 item	Dec. 31, 2012	Oct. 04, 2013
SEGMENT INFORMATION
Number of reportable segments		2us-gaap_NumberOfReportableSegments
Voyage expense recognition
Net (gains) losses on purchase and sale of bunker fuel	$ 852
Number of vessels in vessel pools	8gnk_NumberOfVesselsInVesselPool	8gnk_NumberOfVesselsInVesselPool
Other operating income
Other operating income	530us-gaap_OtherOperatingIncome
Predecessor
Voyage expense recognition
Net (gains) losses on purchase and sale of bunker fuel			(252)	(567)	(1,714)
Number of vessels in vessel pools				5
Other operating income
Other operating income			0	121	265
Samsun
Other operating income
Other operating income	530
Samsun \| Predecessor
Other operating income
Other operating income		530		0	263
Baltic Trading Limited
Voyage expense recognition
Number of vessels in vessel pools	5	5
Baltic Trading Limited \| Predecessor
Voyage expense recognition
Number of vessels in vessel pools				4
Korea Line Corporation
Other operating income
Other operating income		0
Korea Line Corporation \| Predecessor
Other operating income
Other operating income				21	2
Number of shares received related to the rehabilitation plan (in shares)				3,355		3,355
Spot Market-Related Time Charter Agreement with Profit Sharing Element
Voyage expense recognition
Floor price (in dollars per unit)	9	9
Ceiling price (in dollars per unit)	14	14
Allocation of excess profit sharing amount (as a percent)		50.00%
Percentage of average of the daily rates of BHSI used to determine charter agreement rates (as a percent)		115.00%
Spot Market-Related Time Charter Agreement with Profit Sharing Element \| Predecessor
Voyage expense recognition
Number of vessels under spot market-related time charters which include a profit-sharing element				4
Clipper Logger Pool
Voyage expense recognition
Number of vessels in vessel pools	5	5
Clipper Logger Pool \| Predecessor
Voyage expense recognition
Number of vessels in vessel pools				2
Clipper Logger Pool \| Baltic Trading Limited
Voyage expense recognition
Number of vessels in vessel pools	2	2
Clipper Logger Pool \| Baltic Trading Limited \| Predecessor
Voyage expense recognition
Number of vessels in vessel pools				2
Bulkhandling Handymax A/S Pool
Voyage expense recognition
Number of vessels in vessel pools	2	2
Bulkhandling Handymax A/S Pool \| Baltic Trading Limited
Voyage expense recognition
Number of vessels in vessel pools	3	3
Bulkhandling Handymax A/S Pool \| Baltic Trading Limited \| Predecessor
Voyage expense recognition
Number of vessels in vessel pools				2
Navig8 Bulk Pool
Voyage expense recognition
Number of vessels in vessel pools	1	1
LB/IVS Pool \| Predecessor
Voyage expense recognition
Number of vessels in vessel pools				3
Other Income \| Korea Line Corporation \| Predecessor
Other operating income
Fair value of shares received				$ 100		100