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REVENUE FROM TIME CHARTERS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUE FROM TIME CHARTERS [Abstract]
Voyage revenues	$ 58,605	$ 53,603	$ 143,222	$ 174,740
Profit sharing revenue	0	0	0	0
Future minimum time charter revenue [Abstract]
Remainder of 2013	9,676		9,676
2014	$ 7,068		$ 7,068
Additional off-hire period			0 days
Offhire period			20 days

X

- Definition

Represents the additional off-hire days assumed for a vessel, which has a scheduled drydocking.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Represents the expected future minimum charter revenue, based on vessels committed to noncancellable time charter contracts during the next fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the expected future minimum charter revenue, based on vessels committed to noncancellable time charter contracts for the remainder of the fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the assumed offhire days for a vessel which has a scheduled drydocking.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the profit sharing revenue included in time charter revenues.

+ References

No definition available.

+ Details

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

X

- Definition

Revenue from transporting cargo and freight between locations.

+ 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(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

X

- Details

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