Investments in and Advances to Partnerships (Details)	9 Months Ended
	Sep. 30, 2013 partnership property	Sep. 30, 2012 partnership property
Schedule of Equity Method Investments [Line Items]
Number of Local Partnership investments	1
Local Partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Number of Local Partnership investments	1	4
Number of apartment complexes owned	0	3