Condensed Combined Financial Statements of Debtor Subsidiaries (Details Textual) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Reserve For Uncertain Tax Positions	$ 326,121	$ 326,121

Income taxes payable reserve for uncertain tax positions during the period.

No definition available.

Name:	osgiq_ReserveForUncertainTaxPositions
Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant