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Description of Business - Narrative (Details) |  | 12 Months Ended
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Jul. 01, 2021 | Dec. 31, 2021 community segment
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Number of senior living communities |  | 679
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of communities leased |  | 299
Number of reportable segments | segment |  | 3
Current Property Ownership Status |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of communities owned |  | 347
Number of communities leased |  | 299
Number of communities managed by third party |  | 33
Securities Purchase Agreement | HCA Healthcare, Inc. | Health Care Services |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Percentage of ownership sold in transaction | 80.00% |
Percentage of ownership after transaction | 20.00% | 20.00%

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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