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LIABILITIES SUBJECT TO COMPROMISE (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 09, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 12, 2010
Aug. 20, 2010
Predecessor | Chapter 11            
Liabilities subject to compromise            
Interest payable $ 13,199gnk_LiabilitiesSubjectToCompromiseInterestPayable
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Terminated interest rate swap liability 5,622gnk_LiabilitiesSubjectToCompromiseTerminatedInterestRateSwapLiability
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Bond coupon interest payable 1,105gnk_LiabilitiesSubjectToCompromiseBondCouponInterestPayable
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Lease obligation 815gnk_LiabilitiesSubjectToCompromiseLeaseObligation
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Pre-petition accounts payable 41gnk_LiabilitiesSubjectToCompromisePrePetitionAccountsPayable
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Total 1,443,446us-gaap_LiabilitiesSubjectToCompromise
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Predecessor | Chapter 11 | 2010 Notes            
Liabilities subject to compromise            
Debt 117,473gnk_LiabilitiesSubjectToCompromiseDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
2007 Credit Facility | Predecessor | Chapter 11            
Liabilities subject to compromise            
Debt 1,055,912gnk_LiabilitiesSubjectToCompromiseDebt
/ us-gaap_CreditFacilityAxis
= gnk_CreditFacility2007Member
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
$100 Million Term Loan Facility            
Liabilities subject to compromise            
Maximum borrowing capacity   100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
       
$100 Million Term Loan Facility | Chapter 11            
Liabilities subject to compromise            
Maximum borrowing capacity   100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
       
$100 Million Term Loan Facility | Predecessor            
Liabilities subject to compromise            
Maximum borrowing capacity     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
 
$100 Million Term Loan Facility | Predecessor | Chapter 11            
Liabilities subject to compromise            
Debt 73,561gnk_LiabilitiesSubjectToCompromiseDebt
/ us-gaap_CreditFacilityAxis
= gnk_SecuredTermLoanFacilityMember
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
$253 Million Term Loan Facility            
Liabilities subject to compromise            
Maximum borrowing capacity   253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
       
$253 Million Term Loan Facility | Chapter 11            
Liabilities subject to compromise            
Maximum borrowing capacity   253,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
       
$253 Million Term Loan Facility | Predecessor            
Liabilities subject to compromise            
Maximum borrowing capacity     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
$253 Million Term Loan Facility | Predecessor | Chapter 11            
Liabilities subject to compromise            
Debt $ 175,718gnk_LiabilitiesSubjectToCompromiseDebt
/ us-gaap_CreditFacilityAxis
= gnk_SeniorSecuredTermLoanFacilityMember
/ gnk_ReorganizationAxis
= gnk_Chapter11OfUSBankruptcyCodeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember