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Organization, Basis of Presentation, and Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) state community land_parcel home | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($)
Organization and Basis of Presentation |  |  |
Number of Real Estate Properties | community | 270 |  |
Number of apartment homes included in operating apartment communities owned | home | 78,549 |  |
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 | 3,648 |  |
Number of owned communities under construction | community | 21 |  |
Expected number of apartment homes under construction | home | 6,609 |  |
Communities under development rights | community | 28 |  |
Estimated number of apartment homes in communities to be developed | home | 9,769 |  |
Period of lease (in years) | 1 year |  |
Real Estate |  |  |
Number of communities held for sale | community | 1 |  |
Number of land parcels held for sale | land_parcel | 2 |  |
Net operating real estate | $ | $ 15,822,878 |  | $ 16,342,893
Buildings and Building Improvements | Minimum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 7 years |  |
Buildings and Building Improvements | Maximum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 30 years |  |
Computers and furniture | Minimum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 3 years |  |
Computers and furniture | Maximum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 7 years |  |
Accounting Standards Update 2016-02 | Scenario, Forecast | Minimum |  |  |
Real Estate |  |  |
Right of use lease assets | $ |  | $ 100,000 |
Lease liabilities | $ |  | 100,000 |
Accounting Standards Update 2016-02 | Scenario, Forecast | Maximum |  |  |
Real Estate |  |  |
Right of use lease assets | $ |  | 150,000 |
Lease liabilities | $ |  | $ 150,000 |

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