Quarterly report pursuant to Section 13 or 15(d)

Finance Receivables - Special Product (New Neighbor Guaranty program) - Additional Information (Detail)

v3.10.0.1
Finance Receivables - Special Product (New Neighbor Guaranty program) - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Special Product [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Delinquent assessments maximum due period purchases basis 48 months  
Maximum future contingent payments $ 269,000  
New Neighbor Guaranty (NNG) [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Allowance for credit losses $ 51,000 $ 51,000