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DEBT (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |  |  |  |
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Mar. 31, 2015 | Feb. 28, 2015 | Jul. 09, 2014 | Apr. 30, 2015 | Mar. 02, 2015 | Jan. 09, 2015 | Dec. 31, 2014 | Apr. 08, 2015 | Apr. 07, 2015 installment | Jan. 07, 2015 | Oct. 08, 2014 installment | Oct. 24, 2014 | Dec. 30, 2014 | Dec. 31, 2014 | Feb. 27, 2015 | Mar. 31, 2014 | Aug. 29, 2013 item | Aug. 30, 2013 item | Sep. 04, 2013 | Dec. 23, 2013 | Dec. 03, 2013 item | Dec. 23, 2013 | Aug. 12, 2010 item | Aug. 20, 2010 item | Nov. 30, 2010 | Apr. 16, 2010
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion | $ (44,576)us-gaap_LongTermDebtCurrent |  |  |  |  |  | $ (34,324)us-gaap_LongTermDebtCurrent |  |  |  |  |  |  | $ (34,324)us-gaap_LongTermDebtCurrent |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 390,032 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  | 395,811 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  | 395,811 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  |  |  |  |  |
Interest rates on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate (as a percent) | 3.69%us-gaap_DebtInstrumentInterestRateDuringPeriod |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Interest Rates, minimum (excluding impact of swaps and unused commitment fees) (as a percent) | 2.73%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of Interest Rates, maximum (excluding impact of swaps and unused commitment fees) (as a percent) | 3.76%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change of Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership interest percentage (as a percent) | 25.00%gnk_BeneficialOwnershipInterestPercentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change of Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held (as a percent) | 30.00%gnk_PercentageOfOwnershipInterestHeld / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change of Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by Parent (as a percent) | 10.00%gnk_PercentageOfOwnershipInterestHeldByParent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate voting power held (as a percent) | 30.00%gnk_PercentageOfVotingInterestHeldByParent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 65,868 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  | 67,792 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  | 67,792 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  | 130.00%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maintained Aggregate fair market value of the mortgaged vessels as a percentage of aggregate outstanding principal amount (as a percent) |  | 122.40%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmountActual / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shortfall |  | 5,150 gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsShortfallOnAggregateOutstandingPrincipalAmount / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$100 Million Term Loan Facility | Amended and Restated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paydown of debt |  |  | 1,923 us-gaap_RepaymentsOfDebt / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash balance required per vessel owned |  |  | 750 gnk_LineOfCreditFacilityMinimumCashBalanceRequiredPerVesselOwned / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$100 Million Term Loan Facility | April 2015 Amendments | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of upfront fees |  |  |  | 165 gnk_LineOfCreditFacilityPaymentOfUpfrontFee / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_April2015AmendmentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 160,277 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  | 165,568 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  | 165,568 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Remedy period available to post additional collateral or reduce the amount of the revolving loans and/or letters of credit outstanding | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 9,750 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  | 9,750 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  | 9,750 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  | 5,075 us-gaap_LineOfCreditFacilityPeriodicPayment / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  | 5,075 us-gaap_LineOfCreditFacilityPeriodicPayment / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  | 135.00%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  | 135.00%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Maintained Aggregate fair market value of the mortgaged vessels as a percentage of aggregate outstanding principal amount (as a percent) |  |  |  |  |  | 134.80%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmountActual / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember | 130.70%gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmountActual / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of the outstanding indebtedness |  |  |  |  | 216 gnk_PrepaymentOfOutstandingDebt / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$253 Million Term Loan Facility | Amended and Restated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paydown of debt |  |  | 5,075 us-gaap_RepaymentsOfDebt / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash balance required per vessel owned |  |  | 750 gnk_LineOfCreditFacilityMinimumCashBalanceRequiredPerVesselOwned / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$253 Million Term Loan Facility | April 2015 Amendments | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of upfront fees |  |  |  | 350 gnk_LineOfCreditFacilityPaymentOfUpfrontFee / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_April2015AmendmentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | 59,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under uncommitted accordion feature |  |  |  |  |  |  |  |  | 150,000 gnk_LineOfCreditFacilityUncommittedAccordionMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  | 1.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  | 25,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of quarterly installments |  |  |  |  |  |  |  |  | 20 gnk_LineOfCreditFacilityNumberOfQuarterlyInstallments / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Subsequent Event | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly reduction of total amount committed |  |  |  |  |  |  |  |  | 1,641 gnk_QuarterlyReductionInLineOfCredit / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Minimum | Subsequent Event | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  | 3.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly reduction of total amount committed |  |  |  |  |  |  |  |  | 4,137 gnk_QuarterlyReductionInLineOfCredit / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Maximum | Subsequent Event | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  | 4.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Capesize Vessel | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels secured as collateral if accordion feature is exercised |  |  |  |  |  |  |  |  | 6 gnk_NumberOfVesselsSecuredAsCollateralUnderAccordionFeature / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselByTypeAxis = gnk_CapesizeVesselMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Revolving Credit Facility | Supramax Vessel | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels secured as collateral if accordion feature is exercised |  |  |  |  |  |  |  |  | 2 gnk_NumberOfVesselsSecuredAsCollateralUnderAccordionFeature / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2015Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselByTypeAxis = gnk_SupramaxVesselMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$100 Million and $253 Million Term Loan Facilities | Amended and Restated Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityAndSeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$100 Million and $253 Million Term Loan Facilities | April 2015 Amendments | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash required to be maintained by each collateralized vessel |  |  |  | 750 gnk_LineOfCreditFacilityCovenantCashAndCashEquivalentAndRemainingBorrowingCapacityForWorkingCapitalPerVesselRequiredToBeMaintained / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityAndSeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_April2015AmendmentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum total debt outstanding to value adjusted total assets ratio |  |  |  | 70.00%gnk_MinimumTotalDebtToAdjustedTotalAssetsRatio / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityAndSeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_April2015AmendmentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of liquidity covenant amended |  |  |  | 50.00%gnk_MaximumPercentageOfLiquidityCovenantAmended / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityAndSeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_April2015AmendmentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period of available working capital lines |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2010 Baltic Trading Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 102,250 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member |  |  |  |  |  |  | 102,250 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member |  |  |  |  |  |  |  |  |  |  |  |
Payment of Credit Facility |  |  |  |  |  |  |  |  |  | 102,250 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 19,750 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  | 20,125 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  |  | 20,125 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  |  | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $44 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 40,563 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  | 41,250 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  | 41,250 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  |  |  |  |  |  |
Amount of prepayments to have liens released | 18,000 gnk_AmountOfPrepaymentsToHaveLiensReleased / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 33,150 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  | 33,150 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  | 33,150 us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of facilities |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum facility amount of delivered cost per vessel (as a percent) |  |  |  |  |  |  |  |  |  |  | 60.00%gnk_MaximumPercentageOfDeliveredCostPerVesselAllowedUnderCreditFacility / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum facility amount of fair market value per vessel at delivery (as a percent) |  |  |  |  |  |  |  |  |  |  | 60.00%gnk_MaximumPercentageOfFairMarketValueOfVesselAllowedUnderCreditFacility / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum facility amount of delivered cost per vessel |  |  |  |  |  |  |  |  |  |  | 16,800 gnk_MaximumCostPerVesselAllowedUnderCreditFacility / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding principal plus interest insured |  |  |  |  |  |  |  |  |  |  | 95.00%gnk_PercentageOfOutstandingPrincipalPlusInterestInsuredBySinosure / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of semi-annual installments in which the credit facility is to be repaid |  |  |  |  |  |  |  |  |  |  | 20 gnk_LineOfCreditFacilityNumberOfSemiAnnualInstallments / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due per installment (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.16%gnk_PercentageOfFacilityAmountDuePerInstallment / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balloon payment of facility amount due at maturity (as a percent) |  |  |  |  |  |  |  |  |  |  | 16.67%gnk_PercentageOfFacilityAmountDueAsBalloonPaymentAtMaturity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading 2014 Term Loan Facilities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  | three or six-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading 2014 Term Loan Facilities | Baltic Hornet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 16,800 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticHornetMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  | 16,800 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticHornetMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading 2014 Term Loan Facilities | Baltic Wasp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 16,800 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  | 16,350 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember |  |  |  |  |  |  |  |  |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 115,000 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  | 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  | 148,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Amount aggregate outstanding term loan due per installment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.667%gnk_PercentageOfAggregateOutstandingTermLoanFacilityAmountDuePerInstallment / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels mortgaged |  |  |  |  |  |  | 9 gnk_NumberOfVesselsMortgaged / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  | 9 gnk_NumberOfVesselsMortgaged / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period | 115,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |
Amount of consecutive quarterly reductions in maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,447 gnk_AmountOfConsecutiveQuarterlyReductionsInMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember |  |  |  |  |  |  |  |  |  |  |  |
Minimum period for future time charter contracts to be secured under lien |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $148 Million Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $115 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 115,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  |  | 115,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  |  |  | 115,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  | 104,500 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  | 10,500 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 0 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $33 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 33,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember |  |  |  |  |  | 33,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember |  |  |  |  |  |  | 33,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Number of single term loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 gnk_NumberOfSingleTermLoans / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | 33,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $33 Million Term Loan Facility | Baltic Scorpion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum facility amount of delivered cost per vessel |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500 gnk_MaximumCostPerVesselAllowedUnderCreditFacility / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember / gnk_VesselsByNameAxis = gnk_BalticScorpionMember |  |  |  |  |  |  |  |  |  |  |  |
Baltic Trading $33 Million Term Loan Facility | Baltic Mantis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum facility amount of delivered cost per vessel |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500 gnk_MaximumCostPerVesselAllowedUnderCreditFacility / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember / gnk_VesselsByNameAxis = gnk_BalticMantisMember |  |  |  |  |  |  |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rates on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.35%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |  |
Range of Interest Rates, minimum (excluding impact of swaps and unused commitment fees) (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.15%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |  |
Range of Interest Rates, maximum (excluding impact of swaps and unused commitment fees) (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.25%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |  |
Predecessor | 2007 Credit Facility | December 2011 Credit Facility Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee (as a percent) |  |  | 1.00%gnk_LineOfCreditFacilityFeePercentage / us-gaap_CreditFacilityAxis = gnk_CreditFacility2007Member / us-gaap_DebtInstrumentAxis = gnk_December2011CreditFacilityAgreementsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Predecessor | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  | 253,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Number of vessels acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 gnk_NumberOfVesselsToBeAcquiredUnderPurchaseAgreement / us-gaap_CreditFacilityAxis = gnk_SeniorSecuredTermLoanFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Predecessor | $100 Million and $253 Million Term Loan Facilities | Amended and Restated Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable, before increase (as a percent) |  |  | 3.00%gnk_DebtInstrumentBasisSpreadOnVariableRateBeforeAmendment / us-gaap_CreditFacilityAxis = gnk_SecuredTermLoanFacilityAndSeniorSecuredTermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gnk_AmendedAndRestatedCreditFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Predecessor | 2010 Baltic Trading Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  | 150,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 100,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of consecutive semi-annual reductions in total commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 gnk_LineOfCreditFacilityNumberOfConsecutiveSemiAnnualReductionsInMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Amount of semi-annual reductions in maximum borrowing capacity through the maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 gnk_LineOfCreditFacilityAmountOfSemiAnnualReductionsInMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Ratio of maximum facility amount to aggregate appraised value of vessels mortgaged (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00%gnk_RatioOfMaximumFacilityAmountToAggregateAppraisedValueOfVesselsMortgaged / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for condition two (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.35%gnk_ApplicableMarginOverReferenceRateForConditionTwo / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor | 2010 Baltic Trading Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for condition one (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%gnk_ApplicableMarginOverReferenceRateForConditionOne / us-gaap_CreditFacilityAxis = gnk_BalticTradingCreditFacility2010Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |  |
Predecessor | Baltic Trading $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 22,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |
Final payment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,375 gnk_LineOfCreditFacilityPaymentAmountDueAtMaturity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |
Number of quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 gnk_LineOfCreditFacilityNumberOfQuarterlyInstallments / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 us-gaap_LineOfCreditFacilityPeriodicPayment / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |
Period after latest vessel delivery date for first periodic repayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Term of facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
Predecessor | Baltic Trading $22 Million Term Loan Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | three-month LIBOR |  |  |  |  |  |  |  |
Predecessor | Baltic Trading $22 Million Term Loan Facility | Baltic Hare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,730 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / gnk_VesselsByNameAxis = gnk_BalticHareMember |  |  |  |  |  |  |
Predecessor | Baltic Trading $22 Million Term Loan Facility | Baltic Fox |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,270 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / gnk_VesselsByNameAxis = gnk_BalticFoxMember |  |  |  |  |  |  |
Predecessor | Baltic Trading $44 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  | 44,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Final payment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,188 gnk_LineOfCreditFacilityPaymentAmountDueAtMaturity / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Number of quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 gnk_LineOfCreditFacilityNumberOfQuarterlyInstallments / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Amount of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 688 us-gaap_LineOfCreditFacilityPeriodicPayment / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |
Term of facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |
Period after last drawdown date for first periodic repayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |
Predecessor | Baltic Trading $44 Million Term Loan Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Reference rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | three-month LIBOR |  |  |  |  |
Predecessor | Baltic Trading $44 Million Term Loan Facility | Baltic Tiger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,400 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / gnk_VesselsByNameAxis = gnk_BalticTigerMember |  |  |  |
Predecessor | Baltic Trading $44 Million Term Loan Facility | Baltic Lion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,600 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_BalticTradingTermLoanFacilityTwoMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / gnk_VesselsByNameAxis = gnk_BalticLionMember |  |  |  |
Forecast | Baltic Trading $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels purchased by using term loan finance | 2 gnk_NumberOfAssetsAcquiredByFinancingThroughTermLoans / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast | Baltic Trading $33 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels purchased by using term loan finance | 2 gnk_NumberOfAssetsAcquiredByFinancingThroughTermLoans / us-gaap_CreditFacilityAxis = gnk_TermLoanFiveFacilityMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the amount of the quarterly reductions in the maximum borrowing capacity which will occur through the maturity date of the credit facility. + References No definition available. + Details
Name: | gnk_AmountOfConsecutiveQuarterlyReductionsInMaximumBorrowingCapacity
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the minimum prepayment amount to have the lien released on the vessel. + References No definition available. + Details
Name: | gnk_AmountOfPrepaymentsToHaveLiensReleased
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Applicable margin over reference rate if ratio of maximum facility amount to aggregate appraised value of vessels mortgaged is 55% or less. + References No definition available. + Details
Name: | gnk_ApplicableMarginOverReferenceRateForConditionOne
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Applicable margin over reference rate if ratio of maximum facility amount to aggregate appraised value of vessels mortgaged is above 55%. + References No definition available. + Details
Name: | gnk_ApplicableMarginOverReferenceRateForConditionTwo
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the beneficial ownership interest percentage. + References No definition available. + Details
Name: | gnk_BeneficialOwnershipInterestPercentage
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument before amendment. + References No definition available. + Details
Name: | gnk_DebtInstrumentBasisSpreadOnVariableRateBeforeAmendment
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of the semi-annual reductions in the maximum borrowing capacity which will occur through the maturity date of the line of credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityAmountOfSemiAnnualReductionsInMaximumBorrowingCapacity
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the minimum cash required per vessel mortgaged under this facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantCashAndCashEquivalentAndRemainingBorrowingCapacityForWorkingCapitalPerVesselRequiredToBeMaintained
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate fair value of the mortgaged vessels to be maintained as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the aggregate fair value of the mortgaged vessels actual as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmountActual
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of short fall in fair value of mortgaged assets. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsShortfallOnAggregateOutstandingPrincipalAmount
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percentage of facility fee on the average daily outstanding principal amount of the loans outstanding. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityFeePercentage
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum cash balance per vessel required to be maintained for vessels owned under the credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityMinimumCashBalanceRequiredPerVesselOwned
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of consecutive semi-annual reductions in maximum borrowing capacity under the line of credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityNumberOfConsecutiveSemiAnnualReductionsInMaximumBorrowingCapacity
Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of quarterly installments in which the line of credit facility shall be repaid. + References No definition available. + Details
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- Definition Represents the number of quarterly installments in which the line of each credit facility shall be repaid. + References No definition available. + Details
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- Definition Represents the required payment amount under the line of credit facility due on final maturity date. + References No definition available. + Details
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- Definition Represents the amount of upfront fee paid under the terms of credit facilities. + References No definition available. + Details
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- Definition Represents the period after last drawdown date for first periodic repayment of the line of credit facility. + References No definition available. + Details
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- Definition Represents the period after latest vessel delivery date for first periodic repayment of the line of credit facility. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the line of credit facility uncommitted accordion feature. + References No definition available. + Details
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- Definition Represents the maximum delivered cost per vessel allowed under the credit facility. + References No definition available. + Details
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- Definition Represents the maximum percentage of delivered cost per vessel allowed under the credit facility. + References No definition available. + Details
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- Definition Represents the maximum percentage of fair market value per vessel at delivery allowed under the credit facility. + References No definition available. + Details
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- Definition Represents the amended maximum percentage of fleetwide liquidity covenant required. + References No definition available. + Details
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- Definition Represents the minimum contract period for future time charter contracts required to be secured by liens. + References No definition available. + Details
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- Definition Represents the minimum period of working capital lines with remaining availability, in which the covenant of 50% of the required covenant of cash per vessel is satisfied. + References No definition available. + Details
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- Definition Represents the ratio of total debt outstanding to value adjusted total assets (total assets adjustment for the difference between book value and market value of fleet vessels). + References No definition available. + Details
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- Definition Number of assets acquired during the period utilizing funds through term loans. + References No definition available. + Details
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- Definition Number of single term loans for finance requirement. + References No definition available. + Details
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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
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- Definition Represents the number of vessels secured as collateral if the accordion feature is exercised. + References No definition available. + Details
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- Definition Represents the number of vessels to be acquired by the entity under purchase agreement. + References No definition available. + Details
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- Definition Represents percentage of Amount aggregate outstanding term loan facility due per installment. + References No definition available. + Details
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- Definition Represents the percentage of each facility amount due as balloon payment at final maturity. + References No definition available. + Details
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- Definition Represents percentage of facility amount due per installment. + References No definition available. + Details
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- Definition Represents the percentage of outstanding principal plus interest insured by China Export & Credit Insurance Corporation (Sinosure) to cover political and commercial risks. + References No definition available. + Details
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- Definition Represents the ownership by an other party or group NOT including Genco or certain other permitted shareholders. + References No definition available. + Details
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- Definition Represents the ownership by Genco or certain other permitted shareholders. + References No definition available. + Details
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- Definition Represents the aggregate voting power held by parent. + References No definition available. + Details
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- Definition Amount of payment made towards outstanding debt during the period. + References No definition available. + Details
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- Definition The repayment of line of credit facility per quarter. + References No definition available. + Details
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- Definition Represents ratio of maximum facility amount to aggregate appraised value of vessels mortgaged. + References No definition available. + Details
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- Definition Represents the remedy period available to post additional collateral or reduce the amount of the revolving loans and/or letters of credit outstanding under the terms of the credit facilities' covenants. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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X
- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of the required periodic payments of both interest and principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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