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INTEREST RATE SWAP AGREEMENTS (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2014 | Jul. 09, 2014 | Dec. 31, 2014 item | Dec. 31, 2013 derivative
INTEREST RATE SWAP AGREEMENTS |  |  |  |
Number of interest rate swaps |  |  | 0 us-gaap_NumberOfInterestRateDerivativesHeld |
Predecessor |  |  |  |
INTEREST RATE SWAP AGREEMENTS |  |  |  |
Number of interest rate swaps |  |  |  | 4 us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest rate swaps designated as cash flow hedges |  |  |  |
Number of expired interest rate swap agreements |  | 3 gnk_NumberOfInterestRateDerivativesExpired / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Notional amount outstanding |  |  |  | $ 306,233 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest Rate Swap, 4.485% | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Fixed rate (as a percent) |  |  |  | 4.485%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate4.485PercentStartDate14September2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Notional amount outstanding |  |  |  | 106,233 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate4.485PercentStartDate14September2005Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest Rate Swap, 5.25% | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Fixed rate (as a percent) |  |  |  | 5.25%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate5.25PercentStartDate2January2007Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Notional amount outstanding |  |  |  | 50,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate5.25PercentStartDate2January2007Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest Rate Swap, 2.05% | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Fixed rate (as a percent) |  |  |  | 2.05%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate2.05PercentStartDate22January2009Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Notional amount outstanding |  |  |  | 100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate2.05PercentStartDate22January2009Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest Rate Swap, 2.45% | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Fixed rate (as a percent) |  |  |  | 2.45%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate2.45PercentStartDate23February2009Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Notional amount outstanding |  |  |  | 50,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gnk_InterestRateSwapFixedRate2.45PercentStartDate23February2009Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Chapter 11 | DNB Bank ASA | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Secured claim issued with the Bankruptcy Court | $ 5,622 us-gaap_BankruptcyClaimsAmountOfClaimsFiled / dei_LegalEntityAxis = gnk_DNBBankASAMember / gnk_ReorganizationAxis = gnk_Chapter11OfUSBankruptcyCodeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
2007 Credit Facility | Predecessor |  |  |  |
Interest rate swaps designated as cash flow hedges |  |  |  |
Term of interest periods when Company is in default under covenants of 2007 Credit Facility |  | 1 month |  |

X
- Definition Represents the number of interest rate derivative instruments held by the entity which have been expired. + References No definition available. + Details
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X
- Definition The term of interest periods when the Company is in default under the covenants of its 2007 Credit Facility. + References No definition available. + Details
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X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of bankruptcy claim filed with bankruptcy court. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Details
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