Real Property Acquisitions and Development - Narrative (Details) $ in Thousands, £ in Millions, shares in Millions, $ in Millions			1 Months Ended				2 Months Ended	3 Months Ended		9 Months Ended
	Oct. 01, 2024 USD ($) property	Sep. 30, 2024 USD ($) property	Oct. 28, 2025 USD ($) shares	Oct. 28, 2025 GBP (£) shares	Mar. 31, 2025 CAD ($) community parcel	Feb. 28, 2025 USD ($) property	Aug. 31, 2025 USD ($) property	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) property	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) property	Oct. 29, 2025 GBP (£) property	Dec. 31, 2024 USD ($)	[1]
Business Combination [Line Items]
Acquisition measurement period adjustments										$ 50,625
Secured debt								$ 2,487,354		2,487,354			$ 2,338,155
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net								4,025	$ 272,266	70,652	$ 443,416
Allowance for credit losses on real estate loans receivable
Business Combination [Line Items]
Loan Carrying Value								2,414,941		2,414,941
Equity Method Joint Venture
Business Combination [Line Items]
Percentage ownership		25.00%							25.00%		25.00%
Number of properties | property		39							39		39
Payments for investments		$ 205,029
Secured debt		$ 532,575							$ 532,575		$ 532,575
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net									$ 179,770		$ 179,770
Seniors Housing Operating
Business Combination [Line Items]
Acquisition measurement period adjustments										50,625
Care UK Acquisition
Business Combination [Line Items]
Number of assets acquired | property	136
Consideration transferred	$ 841,546
Payments to acquire businesses, gross										20,229
Pro forma								$ 213,246		$ 598,980
Seniors Housing Triple-net Acquisition
Business Combination [Line Items]
Number of assets acquired | property						48	37
Consideration transferred						$ 990,908	$ 785,560
Payment to acquire assets						750,833	543,106
Equity issued in acquisition						$ 240,075	$ 242,454
Amica Senior Lifestyles Acquisition
Business Combination [Line Items]
Consideration transferred					$ 4,600
Amica Senior Lifestyles Acquisition | Secured bond
Business Combination [Line Items]
Asset acquisition debt assumed					$ 567
Interest rate (in percent)					3.70%
Amica Senior Lifestyles Acquisition | Senior Housing Communities
Business Combination [Line Items]
Number of assets acquired | community					38
Amica Senior Lifestyles Acquisition | Development Parcels
Business Combination [Line Items]
Number of assets acquired | parcel					9
U.K. And U.S. Acquisitions | Subsequent event
Business Combination [Line Items]
Consideration transferred | £				£ 5,200
Number of shares issued in asset acquisition (in shares) | shares			6.6	6.6
U.K. And U.S. Acquisitions, Properties Under RIDEA Structure | Subsequent event
Business Combination [Line Items]
Number of assets acquired | property												111
U.K. And U.S. Acquisitions, Properties Subject to Triple Net Lease | Subsequent event
Business Combination [Line Items]
Number of assets acquired | property												152
U.K. And U.S. Acquisitions, Properties Under Development | Subsequent event
Business Combination [Line Items]
Number of assets acquired | property												21
HC-One Group Portfolio | Subsequent event
Business Combination [Line Items]
Number of assets acquired | property												279
Consideration transferred | £				£ 1,200
HC-One Group Portfolio | Subsequent event | Allowance for credit losses on real estate loans receivable
Business Combination [Line Items]
Loan Carrying Value | £												£ 660
Seniors Housing Acquisitions | Subsequent event
Business Combination [Line Items]
Expected consideration			$ 4,700,000
In place lease intangibles | Care UK Acquisition
Business Combination [Line Items]
Useful life										1 year 9 months 18 days
Minimum | Secured bond
Business Combination [Line Items]
Interest rate (in percent)								1.51%		1.51%
Minimum | In place lease intangibles
Business Combination [Line Items]
Useful life										1 year
Maximum | Secured bond
Business Combination [Line Items]
Interest rate (in percent)								6.67%		6.67%
Maximum | In place lease intangibles
Business Combination [Line Items]
Useful life										2 years

[1] The consolidated balance sheet at December 31, 2024 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.