Business (Details)	Dec. 31, 2015
Property/Unit schedule
Wholly Owned Properties	367
Master Leased Properties Acquired	3
Partially Owned Consolidated Properties	19
Partially Owned Unconsolidated Properties	3
Military Housing Properties	2
Wholly Owned Units	98,608
Master Leased Units	853
Partially Owned Consolidated Units	3,771
Partially Owned Unconsolidated Units	1,281
Military Housing Units	5,139
Business (Textuals) [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	96.20%
Number of Real Estate Properties	394
Number of States in which Entity Operates	12
Number of Units in Real Estate Property	109,652
Number of operating properties under long-term ground leases	14