Name:	osgiq_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of operating expenses associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services.

No definition available.

Name:	osgiq_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net result for the period of deducting operating expenses from operating revenues reported by an equity method investment of the entity.

No definition available.

Name:	osgiq_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss
Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities.

No definition available.

Name:	osgiq_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss
Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of net income (loss) reported by an equity method investment of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

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-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Name:	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

No definition available.