Dispositions, Real Property Held for Sale and Impairment - Strategic Dissolution of Revera Joint Ventures (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) property joint_venture	Sep. 30, 2023 USD ($) property project	Jun. 30, 2023 USD ($) property joint_venture	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Dec. 31, 2023 property	Dec. 31, 2022 USD ($)	[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash consideration				$ 361,830,000	$ 0
Loss on real estate dispositions, net				(69,681,000)	(20,466,000)
Net real estate investments		$ 35,690,499,000		35,690,499,000			$ 34,139,819,000
Impairment of assets held for sale				$ 15,401,000	$ 4,356,000
U.K. Portfolio, Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of joint ventures | joint_venture	2		2
U.K. Portfolio, Joint Venture 1
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership	75.00%		75.00%
Proceeds from divestment in joint venture	$ 107,341,000
U.K. Portfolio, Joint Venture 2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership	90.00%		90.00%
US Portfolio, Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership		34.00%		34.00%
Retained interest		$ 47,734,000		$ 47,734,000
US Portfolio, Joint Venture | Revera
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership		66.00%		66.00%
Canadian Portfolio, Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership		75.00%		75.00%
Number of properties | property		85		85
Canadian Portfolio, Joint Venture | Revera
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership		25.00%		25.00%
Revera Joint Venture, Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property	4	13	31
Disposal consideration	$ 222,521,000		$ 222,521,000
Non-cash consideration	241,728,000
Other consideration	198,837,000		198,837,000
Consideration, noncontrolling interest	42,891,000		42,891,000
Transaction related expenses	9,049,000
Real estate disposed	224,208,000	$ 119,258,000	224,208,000	$ 119,258,000
Loss on real estate dispositions, net	1,687,000	(62,075,000)
Cash paid for transaction related expenses	5,776,000
Divestment of noncontrolling interest	180,497,000	$ 56,905,000
Disposal of liabilities	22,270,000		22,270,000
Loss on divestment	$ 1,846,000
Number of projects | project		1
Impairment of assets held for sale			$ 28,708,000
Revera Joint Venture, Disposal Transaction | Avery Healthcare
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property	29
Revera Joint Venture, Disposal Transaction | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property						14
Revera Joint Venture, US Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property		12
Revera Joint Venture, Now Wholly-Owned Properties | Oakmont Management Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property		2
Revera Joint Venture, Existing Wholly-Owned Properties | Oakmont Management Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property		26
Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property	29	10	110	18
Payment for property acquired	$ 10,158,000
Net real estate investments		$ 479,525,000		$ 479,525,000
Cash consideration		31,456,000
Consideration transferred		448,069,000
Debt assumed		$ 270,486,000		$ 270,486,000
Revera Joint Venture | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property						71

[1] The consolidated balance sheet at December 31, 2022 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.