Acquisitions, Dispositions, Leasing and Financing Activities (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
The accompanying unaudited pro forma information
Total revenue	$ 21,430	$ 20,104
Consolidated net income	12,919	7,815
Net income attributable to Winthrop Realty Trust	$ 13,987	$ 8,691
Per common share data - basic	$ 0.34	$ 0.23
Per common share data - diluted	$ 0.34	$ 0.23