Investments In and Advances to Partnerships - Property Matters (Details) (USD $)		0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2013	Dec. 19, 2002 Baltic Plaza [Member]	Mar. 31, 2013 Baltic Plaza [Member]	Apr. 29, 2013 Affiliate of SP Baltic Plaza, LP [Member] Subsequent Event [Member]	Mar. 31, 2013 CRICO Housing Partnership [Member]	Apr. 29, 2013 CRICO Housing Partnership [Member] Affiliate of SP Baltic Plaza, LP [Member] Subsequent Event [Member]	Mar. 31, 2013 C.R.H.C. of Atlantic City, Inc [Member]	Apr. 29, 2013 C.R.H.C. of Atlantic City, Inc [Member] Affiliate of SP Baltic Plaza, LP [Member] Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Cash proceeds from sale		$ 2,053,358
Purchase money note term (in years)		30 years
Purchase money note, principal amount		2,300,000
Interest rate			4.60%
Minimum annual payment, percent of marker/purchaser's annual audited cash flow			50.00%
Beneficial interest in purchase money note			98.00%
Discounted original principal balance plus estimated accrued interest			619,000
Note Receivable, Sale Price	2,000,000
Proceeds from sale of note				$ 1,960,000		$ 39,800		$ 200
Interest in note receivable					1.99%		0.01%