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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2014 segment item | Jul. 09, 2014 | Dec. 31, 2013 item | Dec. 31, 2012 | Oct. 04, 2013
SEGMENT INFORMATION |  |  |  |  |  |
Number of reportable segments |  | 2 us-gaap_NumberOfReportableSegments |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Net (gains) losses on purchase and sale of bunker fuel | $ 852 gnk_GainLossOnPurchaseAndSaleOfBunkerFuel |  |  |  |  |
Number of vessels in vessel pools | 8 gnk_NumberOfVesselsInVesselPool | 8 gnk_NumberOfVesselsInVesselPool |  |  |  |
Other operating income |  |  |  |  |  |
Other operating income | 530 us-gaap_OtherOperatingIncome |  |  |  |  |
Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Net (gains) losses on purchase and sale of bunker fuel |  |  | (252)gnk_GainLossOnPurchaseAndSaleOfBunkerFuel / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (567)gnk_GainLossOnPurchaseAndSaleOfBunkerFuel / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (1,714)gnk_GainLossOnPurchaseAndSaleOfBunkerFuel / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Number of vessels in vessel pools |  |  |  | 5 gnk_NumberOfVesselsInVesselPool / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Other operating income |  |  |  |  |  |
Other operating income |  |  | 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 |  |  |  |  |  |
Other operating income |  |  |  |  |  |
Other operating income | 530 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember |  |  |  |  |
Samsun | Predecessor |  |  |  |  |  |
Other operating income |  |  |  |  |  |
Other operating income |  | 530 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_SamsunLogixCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 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 |
Baltic Trading Limited |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 5 gnk_NumberOfVesselsInVesselPool / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember | 5 gnk_NumberOfVesselsInVesselPool / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember |  |  |  |
Baltic Trading Limited | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools |  |  |  | 4 gnk_NumberOfVesselsInVesselPool / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Korea Line Corporation |  |  |  |  |  |
Other operating income |  |  |  |  |  |
Other operating income |  | 0 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember |  |  |  |
Korea Line Corporation | Predecessor |  |  |  |  |  |
Other operating income |  |  |  |  |  |
Other operating income |  |  |  | 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 |
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
Spot Market-Related Time Charter Agreement with Profit Sharing Element |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Floor price (in dollars per unit) | 9 gnk_CharterAgreementDailyFloorRate / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember | 9 gnk_CharterAgreementDailyFloorRate / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember |  |  |  |
Ceiling price (in dollars per unit) | 14 gnk_CharterAgreementDailyCeilingRate / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember | 14 gnk_CharterAgreementDailyCeilingRate / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember |  |  |  |
Allocation of excess profit sharing amount (as a percent) |  | 50.00%gnk_AllocationOfExcessProfitSharingAmountExpressedAsPercentage / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember |  |  |  |
Percentage of average of the daily rates of BHSI used to determine charter agreement rates (as a percent) |  | 115.00%gnk_PercentageOfAverageDailyRatesOfIndexOnWhichCharterAgreementRatesAreBased / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember |  |  |  |
Spot Market-Related Time Charter Agreement with Profit Sharing Element | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels under spot market-related time charters which include a profit-sharing element |  |  |  | 4 gnk_NumberOfVesselsUnderSpotMarketRelatedTimeChartersWhichIncludeProfitSharingElement / gnk_AgreementAxis = gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Clipper Logger Pool |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 5 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember | 5 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember |  |  |  |
Clipper Logger Pool | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools |  |  |  | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Clipper Logger Pool | Baltic Trading Limited |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember |  |  |  |
Clipper Logger Pool | Baltic Trading Limited | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools |  |  |  | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_ClipperLoggerPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Bulkhandling Handymax A/S Pool |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_BulkhandlingHandymaxPoolMember | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_BulkhandlingHandymaxPoolMember |  |  |  |
Bulkhandling Handymax A/S Pool | Baltic Trading Limited |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 3 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_BulkhandlingHandymaxPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember | 3 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_BulkhandlingHandymaxPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember |  |  |  |
Bulkhandling Handymax A/S Pool | Baltic Trading Limited | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools |  |  |  | 2 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_BulkhandlingHandymaxPoolMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Navig8 Bulk Pool |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools | 1 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_Navig8BulkPoolMember | 1 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_Navig8BulkPoolMember |  |  |  |
LB/IVS Pool | Predecessor |  |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |
Number of vessels in vessel pools |  |  |  | 3 gnk_NumberOfVesselsInVesselPool / gnk_AgreementAxis = gnk_LauritzenBulkersPoolMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Other Income | Korea Line Corporation | Predecessor |  |  |  |  |  |
Other operating income |  |  |  |  |  |
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

X
- Definition Represents the allocation of excess profit sharing amount, expressed as a percentage. + References No definition available. + Details
Name: | gnk_AllocationOfExcessProfitSharingAmountExpressedAsPercentage
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the daily ceiling rate of the charter agreement. + References No definition available. + Details
Name: | gnk_CharterAgreementDailyCeilingRate
Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the daily floor rate of the charter agreement. + References No definition available. + Details
Name: | gnk_CharterAgreementDailyFloorRate
Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
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 Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer. + References No definition available. + Details
Name: | gnk_GainLossOnPurchaseAndSaleOfBunkerFuel
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Represents the number of vessels that were in the vessel pool on a specified date. + References No definition available. + Details
Name: | gnk_NumberOfVesselsInVesselPool
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of vessels under spot market-related time charters, which include a profit-sharing element. + References No definition available. + Details
Name: | gnk_NumberOfVesselsUnderSpotMarketRelatedTimeChartersWhichIncludeProfitSharingElement
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percent of the average daily rates of index referenced on which charter agreement rates are based. + References No definition available. + Details
Name: | gnk_PercentageOfAverageDailyRatesOfIndexOnWhichCharterAgreementRatesAreBased
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OperatingIncomeLossAbstract
Namespace Prefix: | us-gaap_
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: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | gnk_AgreementAxis=gnk_BulkhandlingHandymaxPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gnk_AgreementAxis=gnk_ClipperLoggerPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gnk_AgreementAxis=gnk_LauritzenBulkersPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gnk_AgreementAxis=gnk_Navig8BulkPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gnk_AgreementAxis=gnk_SpotMarketRelatedTimeCharterAgreementWithProfitSharingElementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |