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Acquisitions, Dispositions and Other Significant Transactions - Additional Information (Details) | 12 Months Ended | 36 Months Ended
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Dec. 31, 2019 community | Dec. 31, 2018 joint_venture community | Dec. 31, 2017 community | Dec. 31, 2016 community | Dec. 31, 2018 community
Communities Disposed Of Through Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of |  | 22 | 3 | 50 | 75
Communities Disposed Of Through Lease Terminations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of |  | 89 | 105 | 7 | 201
Ownership Interests In Unconsolidated Ventures |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of unconsolidated ventures interest sold | joint_venture |  | 7 |  |  |
Communities Disposed Of Through Sale And Lease Terminations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities disposed of |  |  |  |  | 276
Forecast |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities expected to be sold | 13 |  |  |  |
Communities Acquired Previously Leased Or Managed |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities acquired |  | 6 |  |  |
Current Property Ownership Status |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities owned |  | 344 |  |  |
Number of communities leased |  | 343 |  |  | 343
Number of communities managed |  | 18 |  |  |
Number of communities managed by third party |  | 187 |  |  | 187

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