Mortagage on real estate (Details) (USD $)	Breakwater Bay USD ($)	Northside on Travis	Capitol Hill	Toulon	Mansions of Mansfield	Preserve at Pecan Creek	Parc at Clarksville	Dorado Ranch	Legends of El Paso apartments	Vistas of Pinnacle Park
Balance of mortagage at Dec. 31, 2012	$ 0
No of units in apartments	176	200	156	240	208	192	168	224	240	332
Amortization schedule in years	40	40	40	40	40	40	40	40	40	40
Balance of mortagage; at Jun. 30, 2013	$ 0
Accrued interest percentage at Jun. 30, 2013	2.50%	2.50%	2.50%	5.37%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
New existing mortagage millions at Jun. 30, 2013	9.8	13.9	9.4	17	16.3	15.1	13.4	16.6	16	19
Paid off amt on existing mortagage at Jun. 30, 2013	9.1	13.5	8.8		15.8	14.6	13.0	16.2	15.2	18.6
Closing costs at Jun. 30, 2013	0.3	1.3	0.3		1.2	1.1	0.7	1.4	1.2	2