Dispositions, Real Property Held for Sale and Impairment - Strategic Dissolution (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2024 USD ($) property	Mar. 31, 2025 USD ($) property	Jun. 30, 2023 property	Jun. 30, 2025 USD ($) property	Jun. 30, 2024 USD ($)	Dec. 31, 2023 property	Dec. 31, 2024 USD ($)	[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net real estate investments				$ 47,381,627			$ 43,851,677
Non-cash consideration				$ 315,468	$ 434,326
Canadian Portfolio, Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership	75.00%
Proceeds from divestiture of interest in joint venture	$ 60,614
Chartwell Joint Venture, Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property		16		16
Real estate property		$ 85,435
Noncontrolling Interest, decrease from deconsolidation		41,064
Gain (loss) on real estate dispositions		$ 53,354
Revera Joint Venture, Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold | property	14		31
Real estate property	$ 293,257
Gain (loss) on real estate dispositions	137,641
Consideration	430,898
Non-cash consideration	434,326
Relieved amount	164,640
Noncontrolling interest	53,174
Transaction related expenses	$ 3,428
Chartwell Joint Venture, Acquisition Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property		23
Net real estate investments		$ 474,384
Payment to acquire assets		77,385
Consideration transferred		396,999
Asset acquisition debt assumed		223,495
Equity method investments		78,538
Other liabilities acquired		$ 9,531
Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property	71		110
Noncontrolling Interest, decrease from deconsolidation	$ 246,564
Consideration transferred, other assets	219,940
Payment for property acquired	51,986
Transaction cost	17,258
Realized gain (loss) on disposal	$ 42,619
Chartwell Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | property		39
Cogir Management Corporation | Chartwell Joint Venture, Disposal Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties transitioned | property		2
Cogir Management Corporation | Chartwell Joint Venture, Acquisition Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property		23
Cogir Senior Living | Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property						53
Levante Living | Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property						12
Optima Living | Revera Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property acquired | property						6

[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.