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Capital Stock and Stock Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reorganization Items, Total $ 3,487us-gaap_ReorganizationItems $ 29,256us-gaap_ReorganizationItems
Stock Issued During Period, Shares, New Issues 694,517us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 32,282us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 58,333us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited 26,051us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited  
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost 8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost  
Number Of Warrants Exchange In Common Stock Issued 695,945osgiq_NumberOfWarrantsExchangeInCommonStockIssued  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Granted, Value, Share-based Compensation, Net of Forfeitures 4,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted Stock Units (RSUs) [Member] | Certain Executive Officers [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Granted, Value, Share-based Compensation, Net of Forfeitures 1,500us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= osgiq_CertainExecutiveOfficersMember
 
Restricted Stock Units (RSUs) [Member] | Ccertain Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Granted, Value, Share-based Compensation, Net of Forfeitures 2,040us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= osgiq_CcertainEmployeesMember
 
Stock Incentive Plan 2004 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reorganization Items, Total $ 357us-gaap_ReorganizationItems
/ us-gaap_PlanNameAxis
= osgiq_StockIncentivePlan2004Member
$ 542us-gaap_ReorganizationItems
/ us-gaap_PlanNameAxis
= osgiq_StockIncentivePlan2004Member