Description of Business (Details)	Jul. 29, 2016	Jun. 30, 2016	Apr. 26, 2016	Jan. 31, 2015
Business Acquisition [Line Items]
Number of multifamily properties owned, operated, or under development		164
Total number of apartment homes in multifamily properties		57,461
Number of multifamily properties under development		7
Total Number of apartment homes in multifamily properties upon completion of development		2,477
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Business Acquisition [Line Items]
Number of operating properties sold			15
Number of Units in Real Estate Property			4,918
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Number of operating properties sold		1		2
Number of Units in Real Estate Property		278		1,116
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Number of operating properties sold	1
Number of Units in Real Estate Property	775
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Subsequent Event [Member] | Dual-Phase Property Sale [Member]
Business Acquisition [Line Items]
Number of operating properties sold	1