Business - Ownership Breakdown (Details)	Jun. 30, 2019 Property ApartmentUnit
Property/Unit schedule
Properties | Property	309
Apartment Units | ApartmentUnit	79,624
Wholly Owned Properties
Property/Unit schedule
Properties | Property	291
Apartment Units | ApartmentUnit	75,927
Master-Leased Properties - Consolidated
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	162
Partially Owned Properties - Consolidated
Property/Unit schedule
Properties | Property	17
Apartment Units | ApartmentUnit	3,535