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Investment In Unconsolidated Subsidiaries And Investees - Percentage in TCI (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
TCI Eton Square, L.P. ("Eton Square")	10.00%	10.00%	10.00%

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- Definition

The percentage of Income Opportunity Realty Investors, Inc. interest in the Other Investee (TCI Eton Square, L.P.) as of stated dates.

+ References

No definition available.

+ Details

Name:	fil_TCIEtonSquareLPEtonSquare
Namespace Prefix:	fil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration