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INTEREST RATE SWAP AGREEMENTS (Details 2) (Interest rate contracts, Predecessor, USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Jul. 09, 2014 item
Impact of derivative instruments and their location within Condensed Consolidated Statement of Operations |  |
Number of vessels mortgaged |  | 35 gnk_NumberOfVesselsMortgaged
Aggregate amount of collateral |  | $ 100,000 us-gaap_CollateralAlreadyPostedAggregateFairValue
Derivatives in cash flow hedging relationships |  |
Impact of derivative instruments and their location within Condensed Consolidated Statement of Operations |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | (179)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Interest Expense. | Derivatives in cash flow hedging relationships |  |
Impact of derivative instruments and their location within Condensed Consolidated Statement of Operations |  |
Amount of Gain (Loss) Reclassified from AOCI into income (Effective Portion) | $ (1,407)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |

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- Definition Represents the number of vessels mortgaged by the entity as collateral in support of agreements. + References No definition available. + Details
Name: | gnk_NumberOfVesselsMortgaged
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration