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CASH FLOW INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Non-cash investing and financing activities    
Settlement of non-accredited Note holders $ 414gnk_CashSettlementOfNonAccreditedNoteHolders  
Reorganization items, net 520us-gaap_ReorganizationItems  
Cash paid for professional fees and trustee fees for Reorganization items 709gnk_CashPaidForReorganizationItems  
Cash paid for interest 3,203us-gaap_InterestPaidNet  
Cash paid for estimated income taxes 454us-gaap_IncomeTaxesPaid  
Reclassification from deposits on vessels to vessels, net of accumulated depreciation 9,694gnk_NoncashOrPartNoncashReclassificationFromDepositsOnVesselsToVessels  
Predecessor    
Non-cash investing and financing activities    
Cash paid for interest   14,163us-gaap_InterestPaidNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Cash paid for estimated income taxes   1,072us-gaap_IncomeTaxesPaid
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Reclassification from deposits on vessels to vessels, net of accumulated depreciation   0gnk_NoncashOrPartNoncashReclassificationFromDepositsOnVesselsToVessels
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Reclassification of fixed assets to vessel assets   984gnk_NoncashOrPartNoncashReclassificationFromFixedAssetsToVessels
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Accounts payable and accrued expenses.    
Non-cash investing and financing activities    
Non-cash investing activities purchase of vessels, including deposits 402gnk_NoncashOrPartNoncashAcquisitionOfVesselsIncludingDeposits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
 
Non-cash investing activities purchase of other fixed assets 98us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
 
Non-cash financing activities deferred financing costs 247us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
 
Settlement of non-accredited Note holders 414gnk_CashSettlementOfNonAccreditedNoteHolders
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
 
Professional fees and trustee fees recognized in Reorganization items, net 124gnk_ReorganizationProfessionalAndTrusteeFeesNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
 
Accounts payable and accrued expenses. | Predecessor    
Non-cash investing and financing activities    
Non-cash investing activities purchase of vessels, including deposits   213gnk_NoncashOrPartNoncashAcquisitionOfVesselsIncludingDeposits
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Non-cash investing activities purchase of other fixed assets   145us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Non-cash financing activities deferred financing costs   253us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Non-cash financing activities common stock issuance costs   5gnk_CommonStockIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Current Interest Payable | Predecessor    
Non-cash investing and financing activities    
Non-cash financing activities deferred financing costs   $ 13,199us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
/ us-gaap_BalanceSheetLocationAxis
= gnk_CurrentInterestPayableMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember