Significant Accounting Policies and Recently Issued Accounting Standards - Narrative (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) property seniorHousingCommunity shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) property seniorHousingCommunity segment shares	Sep. 30, 2021 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Jan. 31, 2021 USD ($)
Accounting Policies [Line Items]
Impairment of long-lived assets	$ 0	$ 0	$ 0	$ 0
Grants receivable	0	$ 0	$ 0	$ 0	$ 9,100,000		$ 8,700,000
Resident receivables due period			30 days
Allowance for doubtful accounts	$ 5,600,000		$ 5,600,000			$ 4,700,000
Number of senior housing communities | seniorHousingCommunity	76		76
Preferred stock, shares issued (in shares) | shares	0		0			0
Number of operating segments | segment			1
Properties | Geographic Concentration Risk | Texas
Accounting Policies [Line Items]
Number of senior housing communities | property	16		16
Properties | Geographic Concentration Risk | Indiana
Accounting Policies [Line Items]
Number of senior housing communities | property	12		12
Properties | Geographic Concentration Risk | Ohio
Accounting Policies [Line Items]
Number of senior housing communities | property	11		11
Properties | Geographic Concentration Risk | Wisconsin
Accounting Policies [Line Items]
Number of senior housing communities | property	8		8
Convertible Preferred Stock
Accounting Policies [Line Items]
Preferred stock, shares issued (in shares) | shares						41,250
Increase in carrying amount of redeemable preferred stock	$ 1,100,000
Housing and support services
Accounting Policies [Line Items]
Contract liabilities for deferred fees paid	2,600,000		$ 2,600,000			$ 2,300,000
Community fees
Accounting Policies [Line Items]
Contract liabilities for deferred fees paid	$ 900,000		$ 900,000			$ 800,000