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REVENUE FROM TIME CHARTERS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Jul. 09, 2014	Jul. 09, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 11, 2015
Voyage revenues	$ 98,817us-gaap_CargoAndFreightRevenue
Profit sharing revenue		0gnk_TimeChartersProfitSharingRevenue
Future minimum time charter revenue
2015							6,024gnk_TimeCharterFutureMinimumRevenueInYearOne
Offhire period		20 days
Predecessor
Voyage revenues			118,759us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	118,759us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	224,179us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	223,159us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Profit sharing revenue					$ 0gnk_TimeChartersProfitSharingRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 0gnk_TimeChartersProfitSharingRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the profit sharing revenue included in time charter revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
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- 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

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