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Operating Units Other Segments (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013 Real Estate Segment [Member] real_estate_properties	Dec. 31, 2012 Real Estate Segment [Member]	Mar. 31, 2013 ARI [Member]	Mar. 31, 2013 Viskase [Member] manufacturing_facilities distribution_centers	Mar. 31, 2013 MASSACHUSETTS Real Estate Segment [Member] real_estate_property_units	Mar. 31, 2013 FLORIDA Real Estate Segment [Member] real_estate_property_units
Segment Reporting Information [Line Items]
Percentage of equity ownership in subsidiary			55.60%	70.80%
Nnumber of Manufacturing Facilities				8
Number of Distribution Centers				10
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage				73.00%
Number of Real Estate commercial rental properties	29
Number of units of residential housing in future development					322	870
Pledged assets	$ 72	$ 73

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- Definition

Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage

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- Definition

Nnumber of Manufacturing Facilities

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- Definition

Number of Distribution Centers

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- Definition

Number of Units of Residential Housing in Future Development

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729



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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)-8

-Paragraph B6

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 22

-Article 12

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