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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Jul. 09, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Oct. 04, 2013 | Feb. 05, 2010
Bankruptcy settlement |  |  |  |  |  |  |
Other operating income recognized | $ 530 us-gaap_OtherOperatingIncome |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Other operating income recognized |  | 0 us-gaap_OtherOperatingIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 121 us-gaap_OtherOperatingIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 265 us-gaap_OtherOperatingIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Samsun |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Other operating income recognized | 530 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember |  |  |  |  |  |
Samsun | Predecessor |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Percentage of bankruptcy claim due remitted |  |  |  | 50.00%gnk_BankruptcyClaimsPercentageOfPaymentsDueRemitted / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Banckruptcy claims received |  |  | 0 gnk_BanckruptcyClaimsReceived / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 263 gnk_BanckruptcyClaimsReceived / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Other operating income recognized |  |  | 0 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 263 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 530 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Korea Line Corporation |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Other operating income recognized |  |  |  |  | 0 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember |  |
Korea Line Corporation | Predecessor |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Other operating income recognized |  |  | 21 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 2 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Settlement Payment |  |  |  | 2 gnk_SettlementPayment / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 21 gnk_SettlementPayment / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Number of shares received related to the rehabilitation plan (in shares) |  |  | 3,355 gnk_NumberOfSharesReceivedRelatedToRehabilitationPlan / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 3,355 gnk_NumberOfSharesReceivedRelatedToRehabilitationPlan / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Korea Line Corporation | Predecessor | Other Income |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Fair value of shares received |  |  | 100 gnk_FairValueOfSharesReceived / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 100 gnk_FairValueOfSharesReceived / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Bankruptcy settlement due | Samsun |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Percentage of bankruptcy claim due remitted |  |  |  |  | 50.00%gnk_BankruptcyClaimsPercentageOfPaymentsDueRemitted / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember |  |
2013 Banckruptcy claims received |  |  |  |  | 234 gnk_BankruptcyClaimsDueTwelveMonthsPastReceived / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember |  |
2012 Banckruptcy claims received |  |  |  |  | 296 gnk_BanckruptcyClaimsDueTwoYearsPastReceived / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember |  |
Bankruptcy settlement due | Samsun | Predecessor |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Amount of bankruptcy claim to be settled following the rehabilitation process |  |  |  |  |  |  | 17,212 gnk_BankruptcyClaimsAmountOfClaimsToBeSettled / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Cash to be received to settle bankruptcy claim as percentage of total settlement |  |  |  |  |  |  | 34.00%gnk_BankruptcyClaimsAmountToBeReceivedInCashToSettleClaimsAsPercentageOfTotalSettlement / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Cash to be received to settle bankruptcy claim |  |  |  |  |  |  | 5,852 gnk_BankruptcyClaimsAmountToBeReceivedInCashToSettleClaims / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Bankruptcy claims settled by conversion into shares of entity (as a percent) |  |  |  |  |  |  | 66.00%gnk_BankruptcyClaimsPercentageOfAmountOfClaimsSettledByConvertingIntoSharesOfEntity / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Amount of bankruptcy claim settled through conversion into shares of entity |  |  |  |  |  |  | $ 11,360 gnk_BankruptcyClaimsAmountOfClaimsSettledByConvertingIntoSharesOfEntity / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Bankruptcy settlement due | Samsun | Predecessor | Minimum |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Percentage of total cash settlement to be received annually |  |  |  |  |  |  | 8.00%gnk_BankruptcyClaimsPercentageOfTotalCashSettlementToBeReceivedAnnually / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Bankruptcy settlement due | Samsun | Predecessor | Maximum |  |  |  |  |  |  |
Bankruptcy settlement |  |  |  |  |  |  |
Percentage of total cash settlement to be received annually |  |  |  |  |  |  | 17.00%gnk_BankruptcyClaimsPercentageOfTotalCashSettlementToBeReceivedAnnually / us-gaap_GainContingenciesByNatureAxis = gnk_BankruptcySettlementDueMember / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X
- Definition Represents the amounts received as a banckruptcy claim due in past two years. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represents the amounts received under banckruptcy claims. + References No definition available. + Details
Name: | gnk_BanckruptcyClaimsReceived
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the amount of bankruptcy claim converted into shares of the entity. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
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- Definition Represents the amount of bankruptcy claim to be settled. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the amount to be received in cash settle bankruptcy claim. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the percentage of settlement of bankruptcy claim to be received in cash as percentage of total settlement. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the amounts received as a banckruptcy claim due in past twelve months. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of bankruptcy claim converted into shares of the entity expressed as percentage. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the percentage of bankruptcy claim due that was remitted. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of total cash settlement to be received annually in bankruptcy claim. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value of shares received in lieu of cash in the payment of a settlement. + References No definition available. + Details
Name: | gnk_FairValueOfSharesReceived
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Share received pursuant to the rehabilitation plan approved by the South Korean courts. + References No definition available. + Details
Name: | gnk_NumberOfSharesReceivedRelatedToRehabilitationPlan
Namespace Prefix: | gnk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Final revised rehabilitation plan approved by the South Korean courts which resulted in a settlement payment. + References No definition available. + Details
Name: | gnk_SettlementPayment
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_GainContingenciesLineItems
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation. + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=gnk_KoreaLineCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=gnk_SamsunLogixCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GainContingenciesByNatureAxis=gnk_BankruptcySettlementDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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