Organization, Basis of Presentation and Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2018 state community home shares
Accounting Policies [Abstract]
Number of operating apartment communities | community	270
Number of apartment homes included in operating apartment communities owned | home	78,388
Number of states where operating apartment communities owned are located | state	12
Number of Communities with Apartments under Reconstruction | community	15
Number of Apartment Homes under Reconstruction | home	6,260
Number of owned communities under construction | community	18
Expected number of apartment homes under construction | home	5,774
Communities under development rights | community	28
Estimated number of apartment homes in communities to be developed | home	9,268
Antidilutive securities excluded from computation of earnings per share, amount | shares	6,995