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Finance Receivables - Summary of Credit Quality Finance Receivable Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Recency delinquency    
Financing Receivable, Past Due [Line Items]    
Finance receivables $ 1,415 $ 255,943
Recency delinquency | Current    
Financing Receivable, Past Due [Line Items]    
Finance receivables 1,368 240,623
Recency delinquency | 30-59 days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 44 7,760
Recency delinquency | 60-89 days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 3 7,560
Recency delinquency | 90+ days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 0 0
Recency delinquency | Total delinquency    
Financing Receivable, Past Due [Line Items]    
Finance receivables 47 15,320
Contractual delinquency    
Financing Receivable, Past Due [Line Items]    
Finance receivables 1,415 255,943
Contractual delinquency | Current    
Financing Receivable, Past Due [Line Items]    
Finance receivables 1,378 220,438
Contractual delinquency | 30-59 days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 34 12,574
Contractual delinquency | 60-89 days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 3 9,852
Contractual delinquency | 90+ days    
Financing Receivable, Past Due [Line Items]    
Finance receivables 0 13,079
Contractual delinquency | Total delinquency    
Financing Receivable, Past Due [Line Items]    
Finance receivables $ 37 $ 35,505