Organization, Basis of Presentation and Significant Accounting Policies (Details) ft² in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) state community home ft²	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) state community home ft²	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Real Estate Properties [Line Items]
Number of operating apartment communities | community	272		272
Number of apartment homes included in operating apartment communities owned | home	78,947		78,947
Number of states where operating apartment communities owned are located | state	11		11
Number of Communities with Apartments under Reconstruction | community	5		5
Number of Apartment Homes under Reconstruction | home	1,818		1,818
Number of owned communities under construction | community	20		20
Expected number of apartment homes under construction | home	6,700		6,700
Communities under development rights | community	31		31
Estimated number of apartment homes in communities to be developed | home	9,994		9,994
Income Tax Expense (Benefit)	$ 11,184	$ 29	$ 11,178	$ 87
Operating lease assets	99,270		99,270
Operating lease obligation	$ 116,489		$ 116,489
Number of Communities Sold with Deferred Tax Obligations | community			2
Accounting Standards Update 2016-02
Real Estate Properties [Line Items]
Operating lease assets					$ 122,276
Operating lease obligation					$ 122,276
TRS Disposed Communities [Member]
Real Estate Properties [Line Items]
Income Tax Expense (Benefit)			$ 4,539
Development Communities [Member] | The Park Loggia [Member]
Real Estate Properties [Line Items]
Retail Square Feet Development | ft²	67		67
Income Tax Expense (Benefit)			$ 6,645
Number Of Residential Units In Development | home	172		172