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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2020 | Jan. 01, 2020 | Jan. 01, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Residency agreement term, minimum | 30 days |  |  |  |  |  |  |  |
Residency agreement term, maximum | 1 year |  |  |  |  |  |  |  |
Maximum period available for occupancy from cessation of significant construction activity | 1 year |  |  |  |  |  |  |  |
Advertising expense | $ 11,000 | $ 18,000 | $ 13,000 |  |  |  |  |  |
Cumulative effect of new accounting principle | 7,058,760 | 7,289,950 | 6,658,859 |  |  |  |  | $ 6,512,591 |
Present value of lease liability | 204,547 | 179,895 |  |  |  |  |  |  |
Right-of-use asset, net | 233,942 | 192,349 |  |  |  |  |  |  |
Intangible assets, net | $ 519,760 | 519,917 |  |  |  |  |  |  |
Building and Building Improvements |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life | 50 years |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Non refundable entrance fee liabilities | $ 496,000 | 484,000 |  |  | $ 436,000 |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Advertising expense | 3,000 | 12,000 | 13,000 |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Present value of lease liability |  |  |  |  |  |  | $ 153,000 |  |
Right-of-use asset, net |  |  |  |  |  |  | 166,000 |  |
Accrued rent |  |  |  |  |  |  | 20,000 |  |
Intangible assets, net |  |  |  |  |  |  | 33,000 |  |
Cumulative Dividends In Excess Of Earnings |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle | $ (4,120,774) | $ (3,976,232) | (3,601,199) |  |  |  |  | (2,927,196) |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  | (1,524) | [1] |  | $ 2,000 |  | 590 | [2]
Cumulative Effect, Period of Adoption, Adjustment | Cumulative Dividends In Excess Of Earnings |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  | $ (1,524) | [1] |  |  |  | $ 590 | [2]
Cumulative Effect, Period of Adoption, Adjustment | Cumulative Dividends In Excess Of Earnings | ASU 2016-02 |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  |  | $ 1,000 |  |
[1] | On January 1, 2020, the Company adopted a series of ASUs related to accounting for credit losses and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.
[2] | On January 1, 2019, the Company adopted a series of Accounting Standards Updates (“ASUs”) related to accounting for leases, and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.

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