Dispositions, Real Property Held for Sale and Impairment - Strategic Dissolution of Revera Joint Ventures (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 30, 2024 USD ($) property	Jun. 30, 2023 USD ($) property joint_venture	Sep. 30, 2023 USD ($) property project	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash consideration				$ 434,326	$ 361,830	$ 0
Net real estate investments				$ 43,851,677	$ 38,775,913
U K Portfolio Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of joint ventures | joint_venture		2
U K Portfolio Revera Joint Venture1
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		75.00%
Proceeds from sale of interest		$ 107,341
U K Portfolio Revera Joint Venture2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		90.00%
U S Portfolio Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage			34.00%
Equity method investments			$ 47,734
U S Portfolio Revera Joint Venture | Revera
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage			66.00%
Canadian Portfolio Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage	75.00%
Proceeds from sale of interest	$ 60,614
Revera Joint Venture Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property	14	4	13		31
Gross sale price	$ 430,898	$ 222,521
Non-cash consideration	434,326	241,728
Other consideration		198,837
Noncontrolling interest	53,174	42,891
Transaction related expenses	3,428	9,049
Payments for disposal		10,158
Real estate property	293,257	224,208	$ 119,258
Gain (loss) on real estate dispositions	137,641	(1,687)	62,075
Payment for transaction related expenses disposal group		5,776
Noncontrolling Interest, decrease from deconsolidation		180,497	$ 56,905
Liabilities		22,270
Realized adjustment on disposal		$ 1,846
Number of projects | project			1
Long term debt	$ 164,640
Revera Joint Venture Disposal Transaction | Avery Healthcare
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties transitioned | property		29
Revera Joint Venture Disposal Transaction U S Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | property			12
Revera Joint Venture Disposal Transaction Now Wholly Owned Properties | Oakmont Management Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties transitioned | 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]
Number of properties transitioned | property			26
Revera Joint Venture Acquisition Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties acquired | property	71	29	10		110
Payment for property acquired	$ 51,986
Transaction cost	17,258
Fair value of interests transferred	219,940
Noncontrolling Interest, decrease from deconsolidation	246,564
Realized adjustment on disposal	$ 42,619
Net real estate investments			$ 479,525
Payments to acquire real estate and real estate joint ventures			31,456
Asset acquisition, consideration transferred			448,069
Asset acquisition debt assumed			$ 270,486
Revera Joint Venture Acquisition Transaction | Cogir Senior Living
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties acquired | property					53
Revera Joint Venture Acquisition Transaction | Levante Living
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties acquired | property					12
Revera Joint Venture Acquisition Transaction | Optima Living
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties acquired | property					6