Mortgage Payable and Other Secured Financing - Additional Information (Details) - Real Estate [Member] - The 50/50 Student Housing--UNL [Member]	1 Months Ended
	Feb. 29, 2020
Tax Increment Financing [Member]
Mortgage Loans On Real Estate [Line Items]
Debt instrument extended maturity period	5 years
Stated Maturities	2025-03
Debt instrument, interest rate, decrease to fixed rate.	4.40%
Mortgages payable [Member]
Mortgage Loans On Real Estate [Line Items]
Debt instrument extended maturity period	7 years
Stated Maturities	2027-04
Debt instrument, interest rate, decrease to fixed rate.	4.35%