Quarterly report pursuant to Section 13 or 15(d)

Finance Receivables - Special Product (New Neighbor Guaranty program) - Schedule of Delinquent Assessments and Accrued Charges (Detail)

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Finance Receivables - Special Product (New Neighbor Guaranty program) - Schedule of Delinquent Assessments and Accrued Charges (Detail) - Special Product [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Unit
Dec. 31, 2017
USD ($)
Unit
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables, net $ 264,000 $ 339,000
Delinquent assessments 799,000 1,200,000
Accrued interest and late fees $ 515,000 $ 728,000
Number of active units with delinquent assessments | Unit 68 97