Quarterly report pursuant to Section 13 or 15(d)

Finance Receivables - Original Product - Schedule of Finance Receivables for Original Product (Detail)

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Finance Receivables - Original Product - Schedule of Finance Receivables for Original Product (Detail) - Original Product [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Unit
Dec. 31, 2019
USD ($)
Unit
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding $ 357,700 $ 386,000
Reserve for credit losses (112,000) (112,000)
Finance receivables, net $ 245,700 $ 274,000
Number of active units with delinquent assessments | Unit 561 598
Amount of outstanding interest and late fees on active units $ 8,793,000 $ 9,167,000
Funded During The Current Year [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 11,900 40,000
1-2 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 27,100 15,000
2-3 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 13,300 20,000
3-4 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding 19,800 11,000
Greater Than 4 Years Outstanding [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Finance receivables outstanding $ 285,600 $ 300,000