Notes Payable - Narrative (Detail) $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2020 USD ($) property	Mar. 31, 2020 seniorHousingCommunity	Sep. 30, 2021 USD ($) seniorHousingCommunity	Sep. 30, 2022 USD ($) property seniorHousingCommunity	Sep. 30, 2021 USD ($) seniorHousingCommunity	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Property and equipment, net				$ 599,200
Other assets, net				2,460			$ 1,166
Amortization of deferred financing costs				946	$ 1,121
Gain (loss) on debt				$ (641)	168,292
Number of properties | seniorHousingCommunity				76
Current portion of note payable, net of deferred loan costs				$ 31,800			31,800
Deferred costs				$ 200			200
Fixed rate mortgage notes payable | Minimum
Debt Instrument [Line Items]
Debt effective interest rate				3.60%
Fixed rate mortgage notes payable | Maximum
Debt Instrument [Line Items]
Debt effective interest rate				6.30%
Variable rate mortgage notes payable (2) | LIBOR
Debt Instrument [Line Items]
Debt instrument, variable rate at period end				3.20%
Debt instrument, basis spread on variable rate				2.14%
Variable rate mortgage notes payable (2) | SOFR
Debt Instrument [Line Items]
Debt instrument, variable rate at period end				3.00%
Debt instrument, basis spread on variable rate				3.50%
Refinance Facility
Debt Instrument [Line Items]
Debt issuance costs, net				$ 2,200
Amortization of deferred financing costs				300
Refinance Facility | Mortgage Debt
Debt Instrument [Line Items]
Number of communities refinanced | seniorHousingCommunity		10
Finance agreement amount						$ 80,000
Amount available as delayed loans						10,000
Additional uncommitted amount						40,000
Debt instrument, covenant, tangible net worth, amount, minimum						150,000
Debt instrument, covenant, liquidity, amount, minimum						13,000
Other assets, net						$ 1,500
Gain (loss) on debt				$ (600)
Refinance Facility | Mortgage Debt | Covenant Achievement, Scenario One
Debt Instrument [Line Items]
Limited payment guaranty, percentage of outstanding balance of the refinance facility						0.33
Refinance Facility | Mortgage Debt | Covenant Achievement, Scenario Two
Debt Instrument [Line Items]
Limited payment guaranty, percentage of outstanding balance of the refinance facility						0.25
Refinance Facility | Mortgage Debt | Covenant Achievement, Scenario Three
Debt Instrument [Line Items]
Limited payment guaranty, percentage of outstanding balance of the refinance facility						0.10
Forbearance Agreements
Debt Instrument [Line Items]
Number of properties | property				2
Accrued interest				$ 3,700			$ 2,700
Fannie Mae Loan | Forbearance Agreements
Debt Instrument [Line Items]
Gain (loss) on debt			$ 54,100		$ 168,300
Unpaid loans	$ 3,800
Number of properties | property	18
Transition of ownership, number of real estate properties | seniorHousingCommunity			5		14