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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Jul. 09, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Income Taxes            
Ownership percentage held by each shareholder (as a percent)   5.00%gnk_OwnershipPercentageHeldByEachShareholder        
Federal tax rate (as a percent)   4.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate        
Taxable income $ (212,362)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments          
Income tax expense 996us-gaap_IncomeTaxExpenseBenefit          
Total revenue earned 1,584us-gaap_SalesRevenueServicesNet          
Intersegment Elimination            
Income Taxes            
Total revenue earned (2,309)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
         
Maximum            
Income Taxes            
Combined ownership held by 5% shareholders (as a percent)   50.00%gnk_CombinedOwnershipPercentageHeldBy5PercentShareholders
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Federal tax rate (as a percent)   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Percentage of shipping income attributable to transportation that begins or ends in the United States included in United States source shipping income (in hundredths)   50.00%gnk_PercentageOfShippingIncomeAttributableToTransportationBeginningOrEndingInDomesticCountryIncludedInSourceShippingIncome
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Vessel Management Services            
Income Taxes            
Taxable income 2,178us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
         
Income tax expense 978us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
         
Total revenue earned 3,893us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
         
Vessel Management Services | Intersegment Elimination            
Income Taxes            
Total revenue earned (2,309)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
         
Predecessor            
Income Taxes            
Ownership percentage held by each shareholder (as a percent)       5.00%gnk_OwnershipPercentageHeldByEachShareholder
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
5.00%gnk_OwnershipPercentageHeldByEachShareholder
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Taxable income     785,372us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(155,123)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(156,554)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Income tax expense     815us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,898us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,222us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Total revenue earned     1,701us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
3,285us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
3,294us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Intersegment Elimination            
Income Taxes            
Total revenue earned     (2,156)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(4,571)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(2,816)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Maximum            
Income Taxes            
Combined ownership held by 5% shareholders (as a percent)           50.00%gnk_CombinedOwnershipPercentageHeldBy5PercentShareholders
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Vessel Management Services            
Income Taxes            
Taxable income     1,723us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
4,235us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2,655us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Income tax expense     776us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,864us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,194us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Total revenue earned     3,857us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
7,856us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
6,110us-gaap_SalesRevenueServicesNet
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Vessel Management Services | Intersegment Elimination            
Income Taxes            
Total revenue earned     (2,156)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(4,571)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(2,816)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_ProductOrServiceAxis
= gnk_VesselManagementServicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Baltic Trading | Minimum            
Income Taxes            
Aggregate voting power held (as a percent) 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
       
Baltic Trading | United States            
Income Taxes            
Taxable income 900us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
         
Income tax expense 18us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
         
Baltic Trading | Predecessor | United States            
Income Taxes            
Taxable income     1,930us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,664us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,379us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Income tax expense     $ 39us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 34us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 28us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember