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

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

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

- 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

- 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

- 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

- 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

REVENUE FROM TIME CHARTERS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2014	Nov. 11, 2014	Jul. 09, 2014 Predecessor	Sep. 30, 2013 Predecessor	Jul. 09, 2014 Predecessor	Sep. 30, 2013 Predecessor
Voyage revenues	$ 43,943		$ 4,034	$ 58,605	$ 118,759	$ 143,222
Profit sharing revenue	0					0
Future minimum time charter revenue
Remainder of 2014		6,051
2015		$ 792
Offhire period	20 days