Description of Business (Details)			9 Months Ended
	Sep. 30, 2021 community segment	Jul. 01, 2021	Sep. 30, 2021 segment community
Segment Reporting Information [Line Items]
Number of senior living communities | community	682		682
Number of reportable segments | segment	4		4
Securities Purchase Agreement | HCA Healthcare, Inc. | Health Care Services
Segment Reporting Information [Line Items]
Sale of stock, percentage of ownership sold in transaction		80.00%
Sale of stock, percentage of ownership after transaction		20.00%