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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
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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
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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_
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