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Investments in and Advances to Unconsolidated Joint Ventures - Schedule of Equity Method Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) property | May 31, 2021 USD ($) property | Apr. 30, 2021 USD ($) preferred_equity_investment property | Jan. 31, 2021 property | Dec. 31, 2019 property | Dec. 31, 2020 USD ($) joint_venture | Jan. 31, 2020 property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count |  |  |  |  |  |  | 15
Investments in and advances to unconsolidated joint ventures | $ | $ 403,634 |  |  |  |  | $ 402,871 |
Number of unconsolidated joint ventures | 3 |  |  |  |  |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments | $ |  |  |  |  |  | $ 6,000 |
Discovery Naples JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  | 41.00% |
Discovery Sarasota JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  | 47.00% |
HCP Ventures IV, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage | 20.00% |  |  |  |  |  |
H C P Ventures III, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage | 30.00% |  |  |  |  |  |
Suburban Properties, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage | 67.00% |  |  |  |  |  |
CCRC JV Investment |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  | 49.00% |  | 49.00%
Proceeds from sale of buildings | $ |  | $ 19,000 |  |  |  |  |
Otay Ranch |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ |  |  | $ 32,000 |  |  |  |
Otay Ranch | Discontinued Operations |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gain on sale of unconsolidated joint venture | $ |  |  | $ 5,000 |  |  |  |
Otay Ranch | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  | 90.00% |
Discovery Naples JV and Discovery Sarasota JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of unconsolidated joint ventures | joint_venture |  |  |  |  |  | 2 |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of assets sold |  | 2 |  |  |  |  |
Proceeds from sale of buildings | $ |  | $ 38,000 |  |  |  |  |
Other | SWF SH JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 19 |  |  |  |  |  |
Investment ownership percentage | 54.00% |  |  |  |  |  |
Equity method investments | $ | $ 355,394 |  |  |  |  | $ 357,581 |
Other | Other Portfolio JVs |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 0 |  |  |  |  |  |
Investment ownership percentage | 0.00% |  |  |  |  |  |
Equity method investments | $ | $ 0 |  |  |  |  | 9,157 |
Life science | Life Science JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 1 |  |  |  |  |  |
Investment ownership percentage | 49.00% |  |  |  |  |  |
Equity method investments | $ | $ 25,605 |  |  |  |  | 24,879 |
Life science | Needham Land Parcel JV |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 0 |  |  |  |  |  |
Investment ownership percentage | 38.00% |  |  |  |  |  |
Equity method investments | $ | $ 13,566 |  |  |  |  | 0 |
Payments to acquire equity method investments | $ | $ 13,000 |  |  |  |  |  |
Medical office |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 4 |  |  |  |  |  |
Number of assets sold |  |  |  |  | 11 |  |
Medical office | Medical Office JVs |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 3 |  |  |  |  |  |
Equity method investments | $ | $ 9,069 |  |  |  |  | 9,673 |
Medical office | Medical Office JVs | Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage | 20.00% |  |  |  |  |  |
Medical office | Medical Office JVs | Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment ownership percentage | 67.00% |  |  |  |  |  |
CCRC | CCRC JV Investment |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count | 0 |  |  |  |  |  |
Investment ownership percentage | 0.00% |  |  |  |  |  |
Equity method investments | $ | $ 0 |  |  |  |  | $ 1,581 |
Senior Housing Operating Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of assets sold |  |  |  | 16 | 18 |  |
Senior Housing Operating Portfolio | Discovery SHOP Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of preferred equity method investments sold | preferred_equity_investment |  |  | 2 |  |  |  |
Number of assets sold |  |  | 10 |  |  |  |
Other non-reportable | Brookedale MTCA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Property count |  |  |  |  |  |  | 13

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