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Real Estate Investments - Narrative (Details) | 1 Months Ended | 12 Months Ended |
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Jun. 30, 2022 USD ($) | Jan. 31, 2022 USD ($) investor | Dec. 31, 2021 USD ($) property | Dec. 31, 2023 USD ($) ft² property unit | Dec. 31, 2022 USD ($) ft² property | Dec. 31, 2021 USD ($) property | Mar. 31, 2017
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 371 |  |  |
Impairment of assets |  |  |  | $ 18,380,000 | $ 0 | $ (174,000) |
Lease committed but unspent tenant related obligations |  |  |  | 54,124,000 | 39,314,000 |  |
Hurricane damage, loss and deductible amount |  |  |  |  | 11,253,000 |  |
Hurricane damage, loss |  |  |  |  | 7,635,000 |  |
Proceeds from insurance recoveries |  |  |  | 534,000 | 14,466,000 | 0 |
Hurricane damage, loss recovered |  |  |  |  | 7,635,000 |  |
Hurricane damage, deductible amount |  |  |  |  | 3,618,000 |  |
Hurricane damage, insurance proceeds in excess of loss, liability |  |  |  | 534,000 | 3,213,000 |  |
Gain (loss) on sale of properties |  |  |  | 1,205,000 | 321,862,000 | 492,272,000 |
Proceeds from sale of interest in joint venture, net |  |  |  | $ 0 | $ 108,424,000 | 367,033,000 |
Seaport Innovation LLC |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Aggregate property valuation amount |  |  | $ 1,700,000,000 |  |  | 1,700,000,000 |
Aggregate principal amount of mortgage debt |  |  | $ 620,000,000 |  |  | $ 620,000,000 |
Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 11 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 2,203,242 |  |  |
Aggregate property valuation amount |  | $ 702,500,000 |  |  |  |  |
Aggregate principal amount of mortgage debt |  | 456,600,000 |  |  |  |  |
Seaport Innovation LLC | Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Proceeds from sale of interest in joint venture, net | $ 108,000 |  |  |  |  |  |
Seaport Innovation LLC | Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 1 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 1,134,479 |  |  |
Equity method investment ownership percentage | 20.00% |  | 20.00% | 10.00% |  | 20.00% | 55.00%
Additional equity joint venture percentage | 10.00% |  | 35.00% |  |  |  |
Proceeds from sale of interest in joint venture, net |  |  | $ 378,000 |  |  |  |
Seaport Innovation LLC | Corporate Joint Venture | Investor |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  | 45.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  | 5 | 8 | 0 | 5 |
Sale price of property sold and agreed to be sold |  |  |  | $ 18,880,000 |  | $ 104,500,000 |
Medical Office Building and Life Science Building |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 102 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 8,600,000 |  |  |
Medical Office Building and Life Science Building | Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Proceeds from sale of interest in joint venture, net |  | $ 653,300,000 |  |  |  |  |
Number of third party institutional investors | investor |  | 2 |  |  |  |  |
Medical Office Building and Life Science Building | Seaport Innovation LLC | Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Equity method investment ownership percentage | 10.00% |  |  |  |  |  |
Medical Office Building and Life Science Building | Diversified Healthcare Trusts | Corporate Joint Venture |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 20.00% |  |  |  |  |
Medical Office Building and Life Science Building | Diversified Healthcare Trusts | Corporate Joint Venture | Unrelated Investor One |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 41.00% |  |  |  |  |
Medical Office Building and Life Science Building | Diversified Healthcare Trusts | Corporate Joint Venture | Unrelated Investor Two |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 39.00% |  |  |  |  |
Medical Office Building and Life Science Building | Capital Commitments |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 900,000 | 900,000 |  |
Leases committed expenditure |  |  |  | $ 62,180,000 | $ 22,911,000 |  |
Senior Living Communities, Independent Living, Assisted Living, and Skilled Nursing Facility |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 259 |  |  |
Senior Living Communities |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of units in real estate property | unit |  |  |  | 27,271 |  |  |
Senior Living Communities | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of real estate properties held for sale | property |  |  |  | 1 | 1 |  |
Welness Centers |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 10 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 812,000 |  |  |
Welness Centers | Capital Commitments |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 200,000 |  |  |
Life Science And Medical Office And Senior Living Communities |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Impairment of assets |  |  |  | $ 14,034,000 |  |  |
Life Science / Medical Office |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 4 |  |  |
Life Science / Medical Office | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 3 |  |  |
Life Science / Medical Office | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 1 |  |  |
Senior Living Communities |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 2 |  |  |
Impairment of assets |  |  |  | $ 4,346,000 |  |  |
Senior Living Communities | Skilled Nursing Bed License |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Gain (loss) on sale of properties |  | $ 322,468,000 |  |  | $ (1,428,000) | $ 461,434,000 |
Senior Living Communities | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 1 |  |  |
Skilled Nursing Bed Licenses |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Gain on transaction |  |  |  | $ 940,000 |  |  |

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