Organization, Basis of Presentation and Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 shares	Mar. 31, 2019 USD ($) state community home	Jan. 01, 2019 USD ($)
Accounting Policies [Abstract]
Number of operating apartment communities | community		272
Number of apartment homes included in operating apartment communities owned | home		79,143
Number of states where operating apartment communities owned are located | state		12
Number of Communities with Apartments under Reconstruction | community		9
Number of Apartment Homes under Reconstruction | home		3,396
Number of owned communities under construction | community		19
Expected number of apartment homes under construction | home		6,170
Communities under development rights | community		29
Estimated number of apartment homes in communities to be developed | home		10,050
Real Estate Properties [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	6,995
Operating lease assets | $		$ 102,312
Operating lease obligation | $		$ 120,202
Accounting Standards Update 2016-02
Real Estate Properties [Line Items]
Operating lease assets | $			$ 122,276
Operating lease obligation | $			$ 122,276