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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 | $ 98,817 us-gaap_CargoAndFreightRevenue |  |  |  |  |  |
Profit sharing revenue |  | 0 gnk_TimeChartersProfitSharingRevenue |  |  |  |  |
Future minimum time charter revenue |  |  |  |  |  |  |
2015 |  |  |  |  |  |  | 6,024 gnk_TimeCharterFutureMinimumRevenueInYearOne
Offhire period |  | 20 days |  |  |  |  |
Predecessor |  |  |  |  |  |  |
Voyage revenues |  |  | 118,759 us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 118,759 us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 224,179 us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 223,159 us-gaap_CargoAndFreightRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Profit sharing revenue |  |  |  |  | $ 0 gnk_TimeChartersProfitSharingRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 0 gnk_TimeChartersProfitSharingRevenue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |

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

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

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- 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

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- 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

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

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
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Balance Type: |
Period Type: |