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SEGMENT INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Dec. 31, 2014
SEGMENT INFORMATION      
Number of reportable segments 2us-gaap_NumberOfReportableSegments    
Number of operating segments 2us-gaap_NumberOfOperatingSegments    
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers $ 33,609us-gaap_CargoAndFreightRevenue    
Intersegment revenue      
Total consolidated intersegment revenue 810us-gaap_SalesRevenueServicesNet    
Net loss      
Net loss (79,115)us-gaap_ProfitLoss    
Total assets      
Total consolidated assets 1,694,819us-gaap_Assets   1,752,913us-gaap_Assets
Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers 33,609us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
   
Intersegment revenue      
Total consolidated intersegment revenue 1,379us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
   
Net loss      
Net loss (78,840)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
   
Total assets      
Total consolidated assets 1,696,884us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
  1,753,338us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Intersegment Elimination      
Intersegment revenue      
Total consolidated intersegment revenue (1,379)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
   
Net loss      
Net loss (275)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
   
Total assets      
Total consolidated assets (2,065)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
  (425)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Predecessor      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers   63,180us-gaap_CargoAndFreightRevenue
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Intersegment revenue      
Total consolidated intersegment revenue   810us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net loss      
Net loss   (42,238)us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers   63,180us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Intersegment revenue      
Total consolidated intersegment revenue   1,045us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net loss      
Net loss   (42,102)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Intersegment Elimination      
Intersegment revenue      
Total consolidated intersegment revenue   (1,045)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net loss      
Net loss   (136)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Baltic Trading | Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers 6,911us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
   
Net loss      
Net loss (45,811)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
   
Total assets      
Total consolidated assets 451,181us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
  482,415us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
Baltic Trading | Predecessor | Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers   13,091us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net loss      
Net loss   (3,533)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_BalticTradingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
GS&T | Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers 26,698us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
   
Intersegment revenue      
Total consolidated intersegment revenue 1,379us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
   
Net loss      
Net loss (33,029)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
   
Total assets      
Total consolidated assets 1,245,703us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
  1,270,923us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
GS&T | Predecessor | Operating Segments      
Voyage revenue from external customers      
Total consolidated voyage revenue from external customers   50,089us-gaap_CargoAndFreightRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Intersegment revenue      
Total consolidated intersegment revenue   1,045us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Net loss      
Net loss   $ (38,569)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= gnk_GencoShippingAndTradingMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember