Accounting Policies and Related Matters - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agreements with residents, cancelable period	30 days
Redeemable noncontrolling interest weighted average redemption period	4 years
Redeemable noncontrolling interests, carrying value	$ 384,443
Current redemption value of redeemable noncontrolling interest that exceeded the carrying value	$ 65,575
Shares issuable upon redemption	1
Property operating expenses	$ 3,558,770	$ 2,774,562	$ 2,597,823
COVID-19 | Grant
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from contract with customer		$ 4,642	3,014
COVID-19 | Seniors Housing Operating
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Spot occupancy	78.30%	76.30%		78.00%	77.10%	76.30%	74.90%	73.00%	72.70%
Increase in operational cost	$ 33,099	$ 63,681	110,719
Cost of property operating expense	$ 38,607	$ 97,933	$ 31,927
Buildings | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	15 years
Buildings | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	40 years
Improvements | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	5 years
Improvements | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Properties, estimated useful life	15 years