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Severance Costs (Details) (Severance Reserve Outsourcing RIF [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Severance Reserve Outsourcing RIF [Member]
    
Activity for the three months ended March 31,    
Beginning Balance $ 1,159us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember		 $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember
Original estimate 0osgiq_RestruturingChangeInEstimate
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember		 6,334osgiq_RestruturingChangeInEstimate
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember
Utilized (693)osgiq_RestructuringUtilized
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember		 (289)osgiq_RestructuringUtilized
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember
Ending Balance $ 466us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember		 $ 6,045us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= osgiq_SeveranceReserveOutsourcingRifMember