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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 12, 2010
Aug. 01, 2012
Aug. 20, 2010
$100 Million Term Loan Facility            
Fair value of financial instruments            
Floating rate debt $ 67,792us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
         
Face amount of term loan facility 100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
         
$253 Million Term Loan Facility            
Fair value of financial instruments            
Restricted cash 9,750us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
         
Floating rate debt 165,568us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
         
Face amount of term loan facility 253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
         
Baltic Trading $22Million Term Loan Facility            
Fair value of financial instruments            
Face amount of term loan facility 22,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityOneMember
         
Baltic Trading $44 Million Term Loan Facility            
Fair value of financial instruments            
Face amount of term loan facility 44,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityTwoMember
         
Baltic Trading $148 Million Credit Facility            
Fair value of financial instruments            
Face amount of term loan facility 148,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityFourMember
         
Carrying Value            
Fair value of financial instruments            
Cash and cash equivalents 83,414us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
         
Restricted cash 29,695us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
         
Floating rate debt 430,135us-gaap_LineOfCredit
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
         
Estimate of Fair Value Measurement            
Fair value of financial instruments            
Cash and cash equivalents 83,414us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
         
Restricted cash 29,695us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
         
Floating rate debt 430,135us-gaap_LineOfCredit
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
         
Predecessor | $100 Million Term Loan Facility            
Fair value of financial instruments            
Floating rate debt   75,484us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Face amount of term loan facility   100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor | $100 Million Term Loan Facility | August 2012 Credit Facility Agreements            
Fair value of financial instruments            
Face amount of term loan facility         100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ us-gaap_DebtInstrumentAxis
= gnk_August2012CreditFacilityAgreementsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | $253 Million Term Loan Facility            
Fair value of financial instruments            
Restricted cash   9,750us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Floating rate debt   180,793us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Face amount of term loan facility   253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
    253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | $253 Million Term Loan Facility | August 2012 Credit Facility Agreements            
Fair value of financial instruments            
Face amount of term loan facility         253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ us-gaap_DebtInstrumentAxis
= gnk_August2012CreditFacilityAgreementsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Baltic Trading $22Million Term Loan Facility            
Fair value of financial instruments            
Face amount of term loan facility   22,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityOneMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Predecessor | Baltic Trading $44 Million Term Loan Facility            
Fair value of financial instruments            
Face amount of term loan facility   44,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_TermLoanFacilityTwoMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Predecessor | Carrying Value            
Fair value of financial instruments            
Cash and cash equivalents   122,722us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Restricted cash   10,150us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Floating rate debt   1,480,064us-gaap_LineOfCredit
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
2010 Notes   115,881us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Predecessor | Estimate of Fair Value Measurement            
Fair value of financial instruments            
Cash and cash equivalents   122,722us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Restricted cash   10,150us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
2010 Notes   $ 63,438us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember