Student Housing Properties (Details Textual) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Oct. 18, 2010	Dec. 31, 2012	Dec. 31, 2011
Other assets, net			$ 16,275,000	$ 12,819,000
Other Assets [Member]
Depreciation	100,000	200,000	300,000	300,000
Corporate Furniture Fixtures and Equipment [Member]
Other assets, net			$ 3,100,000	$ 500,000