Debt Financing - Summary of Term A/B Trust Collapsed and Paid Off Partnership's Carrying Value Plus Accrued Interest (Details) - Mortgage Revenue Bonds [Member] - Term A/B Trust [Member]	6 Months Ended
	Jun. 30, 2018 USD ($)
Seasons Lakewood Series B [Member]
Short Term Debt [Line Items]
Paydown Applied	$ 4,475,000
Summerhill Series B [Member]
Short Term Debt [Line Items]
Paydown Applied	2,870,000
Oaks at Georgetown Series B [Member]
Short Term Debt [Line Items]
Paydown Applied	4,690,000
San Vicente Series B [Member]
Short Term Debt [Line Items]
Paydown Applied	1,555,000
The Village At Madera Series B [Member]
Short Term Debt [Line Items]
Paydown Applied	$ 1,465,000