Finance Receivables - Special Product (New Neighbor Guaranty program) - Schedule of Delinquent Assessments and Accrued Charges (Detail) - Special Product [Member]	12 Months Ended
	Dec. 31, 2021 USD ($) Unit	Dec. 31, 2020 USD ($) Unit
Accounts Notes And Loans Receivable [Line Items]
Finance receivables, net	$ 14,000	$ 53,000
Delinquent assessments	121,000	148,000
Accrued interest and late fees	$ 45,000	$ 57,000
Number of active units with delinquent assessments | Unit	8	20