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Investments in and Advances to Unconsolidated Joint Ventures - Narrative (Details) $ in Thousands, £ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 property | Oct. 31, 2019 property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Difference between carrying amount and underlying equity |  | $ (63,000) |  | $ 33,000 | $ (63,000) |  |  |
Impairment charge |  |  |  |  | 6,000 |  |  |
Property count | property | 15 |  |  |  |  |  |  |
Losses on sales of investment real estate |  |  |  | $ (90,350) | 40 | $ (831,368) |  |
CCRC JV Investment |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  | $ 12,000 |  |  |
Investment ownership percentage | 49.00% | 49.00% |  | 49.00% | 49.00% |  |  |
U.K. JV |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  | 49.00% |  |  |
Proceeds from sale of equity method investments |  | $ 91,000 | £ 70 |  |  |  |  |
Loss on sale of properties |  | 7,000 |  |  |  |  |  |
Losses on sales of investment real estate |  | $ 1,000 |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Losses on sales of investment real estate | $ (164,000) |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Interest acquired | 51.00% |  |  |  |  |  |  |
CCRC JV Investment | Brookedale MTCA |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Property count | property | 15 |  |  |  |  |  |  |
Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Property count | property |  |  |  |  |  |  | 1 |
Assets leased to others | Other Non-Reporting Segment | Brookedale MTCA |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Property count | property | 13 |  |  |  |  |  |  |
Assets leased to others | Other Non-Reporting Segment | CCRC JV Investment |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Property count | property |  |  |  |  |  |  | 15 | 15
Assets leased to others | Other Non-Reporting Segment | CCRC JV Investment | Brookedale MTCA |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Property count | property | 13 |  |  | 13 |  |  | 13 |

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