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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

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