Debt - Schedule of Company's Outstanding Debt (Parenthetical) (Detail) $ in Millions			3 Months Ended	6 Months Ended
	Aug. 31, 2018	Feb. 23, 2018 Loan	Jun. 30, 2021 USD ($) Property Loan	Jun. 30, 2021 Property Loan
Freddie Mac Utah Loans [Member]
Debt Instrument [Line Items]
Debt instrument, interest payment period		2 years		2 years
Amortization period		30 years		30 years
Number of mortgage loans | Loan		3	3	3
Number of senior housing properties acquired | Property			3	3
Freddie Mac Courtyard Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest payment period	4 years			4 years
Amortization period	30 years			30 years
PPP Loans [Member]
Debt Instrument [Line Items]
Debt forgiveness and the related accrued interest | $			$ 2.0