Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Restructuring (Details)		1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 26, 2020 USD ($) community extensionOption $ / shares shares	Oct. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Initial annual minimum rent amount				$ 1,065,623,000
Repayments of lines of credit				$ 0	$ 166,381,000	$ 0
Common stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01
Payments for lease restructuring					$ 119,200,000
Ventas, Inc
Business Acquisition [Line Items]
Number of communities leased | community	120
Initial annual minimum rent amount	$ 100,000,000
Reduction in rent amount to be paid	$ 83,000,000
Annual escalator rate	3.00%
Number of extensions | extensionOption	2
Term of extensions	10 years
Period of lease	24 months
Capital expenditures incurred but not yet paid	$ 37,800,000
Minimum tangible net worth	600,000,000
Control fees	$ 25,000,000
Number of owned communities transferred | community	5
Extinguishment of debt	$ 78,400,000
Cash payments to related party	115,000,000
Deposit disbursements	42,400,000
Repayments of lines of credit	4,200,000
Operating lease obligations			$ 370,000,000
Assets under leases			$ 159,500,000
Payments for lease restructuring					$ 119,200,000
Ventas, Inc | Community Level Basis
Business Acquisition [Line Items]
Escrow amount	1,500
Ventas, Inc | Aggregate Community Basis
Business Acquisition [Line Items]
Escrow amount	$ 3,600
Disbursement Multiplier | Ventas, Inc
Business Acquisition [Line Items]
Annual escalator rate	50.00%
Multiplier Percentage | Ventas, Inc
Business Acquisition [Line Items]
Annual escalator rate	4.50%
Unsecured Debt | Ventas, Inc
Business Acquisition [Line Items]
Debt face amount	$ 45,000,000
Interest rate	9.00%
Interest rate percentage increase per anniversary	0.50%
Repayment of debt		$ 45,000,000
The Warrant | Ventas, Inc
Business Acquisition [Line Items]
Number of shares authorized to be purchased | shares	16,300,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Share price (in usd per share) | $ / shares	$ 3.00
Shares voting percentage ownership cap	9.60%
Value of warrants issued	$ 22,900,000