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Earnings per Common Share (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 3.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
Common Stock, Shares, Outstanding 44,290,759us-gaap_CommonStockSharesOutstanding  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 453,586us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 854,644us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Earnings Per Share, Potentially Dilutive Securities 3,603  
Common Class A [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock, Shares, Outstanding 310,726,271us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 266,664us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Class A [Member] | Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common Stock, Shares, Outstanding 196,349us-gaap_CommonStockSharesOutstanding
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Class A [Member] | Stock Compensation Plan [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common Stock, Shares, Outstanding 453,586us-gaap_CommonStockSharesOutstanding
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Class A Warrants Outstanding [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Class of Warrant or Right, Outstanding 210,145,872us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementClassOfStockAxis
= osgiq_ClassWarrantsOutstandingMember
 
Class B Warrants Outstanding [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Class of Warrant or Right, Outstanding 2,212,204us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementClassOfStockAxis
= osgiq_ClassBWarrantsOutstandingMember
 
Common Class B [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common Stock, Shares, Outstanding 5,711,847us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember