Accounting Policies and Related Matters - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 05, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Agreements with residents, term		1 year	1 year
Agreements with residents, cancelable period			30 days
Redeemable noncontrolling interests, carrying value		$ 343,490	$ 343,490
Current redemption value of redeemable noncontrolling interest that exceeded the carrying value			15,696
Increase in operational cost			$ 78,792
Cost of property operating expense		9,000
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member
Allowance for credit loss on loans receivable		$ 224,036	$ 224,036	$ 68,372	$ 68,372	$ 68,372
Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of property operating expense	$ 34,000
COVID-19
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rent collected percentage			99.00%
Percentage of deferred rent collected		99.00%
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
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]				us-gaap:AccountingStandardsUpdate201613Member
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss on loans receivable				$ 5,212	$ 0	$ 0