Significant Transactions (Details Textual) $ in Millions	Apr. 20, 2020 USD ($)	Mar. 31, 2020 Property Community	Mar. 31, 2019 Property
Wholly And Partially Owned Consolidated Properties [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of apartment communities		120
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Wholly And Partially Owned Consolidated Properties [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of apartment communities sold		0	7
Held-for-sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of apartment communities | Community		0
Subsequent Event [Member] | Term Loan [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Secured term loan | $	$ 350.0
Term loan maturity date	Apr. 20, 2021
Term loan option to extend	1 year
Variable interest rate description	currently bears interest at a 30-day LIBOR plus 1.85%, with a 50-basis point LIBOR floor.
Subsequent Event [Member] | Term Loan [Member] | 30-Day LIBOR [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Spread on variable interest rate	1.85%
Subsequent Event [Member] | Term Loan [Member] | LIBOR Floor [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Spread on variable interest rate	0.50%