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]
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Unit
Dec. 31, 2018
USD ($)
Unit
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables, net $ 245,200 $ 237,000
Delinquent assessments 667,000 707,000
Accrued interest and late fees $ 413,600 $ 465,000
Number of active units with delinquent assessments | Unit 63 58