Business (Details)	Sep. 30, 2016
Business (Textuals) [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	96.20%
Number of States in which Entity Operates	10
Property/Unit schedule
Properties	308
Apartment Units	78,826
Wholly Owned Properties
Property/Unit schedule
Properties	285
Apartment Units	73,557
Master-Leased Properties – Consolidated
Property/Unit schedule
Properties	3
Apartment Units	853
Partially Owned Properties – Consolidated
Property/Unit schedule
Properties	18
Apartment Units	3,471
Partially Owned Properties – Unconsolidated
Property/Unit schedule
Properties	2
Apartment Units	945