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Variable Interest Entities - Narrative (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 01, 2024 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2025 USD ($) entity joint_venture hospital | Feb. 28, 2025 USD ($) | Dec. 31, 2024 USD ($) joint_venture entity
Variable Interest Entity [Line Items] |  |  |  |  |
Number of DownREIT LLCs | entity |  |  | 8 |  | 8
Secured Mortgage Loans |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Loans receivable, outstanding balance | $ 89,000 |  |  |  |
Outpatient medical | Other | Secured Mortgage Loans |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Loans receivable, outstanding balance |  |  | $ 41,000 |  |
Other Equity |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity method investment, amount |  |  | 3,000 |  | $ 1,000
Equity investment, aggregate cost |  |  | 12,000 |  |
Needham Land Parcel JV | Lab Buildings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity method investment, amount |  |  | $ 12,291 |  | $ 21,348
Investment ownership (as a percent) |  | 38.00% | 38.00% |  |
Cash paid |  | $ 13,000 |  |  |
HQ Point Investment |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity investment, aggregate cost |  |  |  | $ 50,000 |
HQ Point Investment | Lab Buildings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Payments to acquire equity investments |  |  | $ 45,000 |  |
Unconsolidated Variable Interest Entities | Commercial Mortgage-Backed Securities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of hospitals | hospital |  |  | 3 |  |
Ventures V |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ownership percentage (as a percent) |  |  | 51.00% |  |
MSREI JV |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ownership percentage (as a percent) |  |  | 51.00% |  |
DownREIT Partnerships |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of DownREIT LLCs | joint_venture |  |  | 8 |  | 8

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