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Organization, Basis of Presentation, and Significant Accounting Policies (Details) ft² in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² community residential_condominium state home | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Real Estate |  |  |
Number of real estate properties | 273 |  |
Number of apartment homes included in operating apartment communities owned | home | 80,094 |  |
Number of states where operating apartment communities owned are located | state | 11 |  |
Number of owned communities under construction | 18 |  |
Expected number of apartment homes under construction | home | 5,931 |  |
Communities under development rights | 24 |  |
Estimated number of apartment homes in communities to be developed | home | 7,853 |  |
Number of communities held for sale | 1 |  |
Right of use lease assets | $ | $ 133,581,000 | $ 103,063,000 |
Accounts Receivable, Credit Loss Expense (Reversal) | $ | 66,763,000 |  | $ 14,072,000
Impairment of Long-Lived Assets Held-for-use | $ | $ 0 | $ 0 | $ 0
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 |  |
Furniture and Fixtures | Minimum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 3 years |  |
Furniture and Fixtures | Maximum |  |  |
Real Estate |  |  |
Estimated useful life of buildings and improvements (in years) | 7 years |  |
The Park Loggia [Member] |  |  |
Real Estate |  |  |
Number of residential units in development | residential_condominium | 172 |  |
Retail square feet development | ft² | 66 |  |
Percent of Commercial Square Feet Leased | 69.00% |  |

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