Percentage of litigation recovery during the period.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_LitigationCaseAxis=osgiq_SecInvestigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	osgiq_LitigationSettlementAxis=osgiq_FinalOrderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands					3 Months Ended
	Aug. 05, 2016	Apr. 05, 2016	Aug. 05, 2015	Aug. 05, 2014	Mar. 31, 2016	Dec. 31, 2016	Aug. 12, 2014
Loss Contingencies [Line Items]
Litigation recovery percentage expected to be disbursed to the class action plaintiffs	15.00%	15.00%
Proskauer Action [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 2,136
Litigation recovery percentage expected to be disbursed to the class action plaintiffs	15.00%				15.00%
Equity Plan [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount				$ 7,000
Equity Plan [Member] \| Proskauer Action [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount			$ 3,000
Equity Plan [Member] \| SEC Investigation [Member]
Loss Contingencies [Line Items]
Estimated litigation liability						$ 5,000
Final Order [Member] \| Equity Plan [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount	$ 5,000
Former Officers And Directors [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss							$ 10,500
Former Underwriters [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss							4,000
Independent Registered Public Accounting Firm [Member] \| Former Officers And Directors [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss							$ 1,750