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Finance Receivables - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Accrual period for financing receivables 60 days    
Aggregate unpaid principal balance $ 332,517,000 $ 332,244,000  
Fair value of receivables 381,845,000 [1] 383,890,000  
Reserve for repurchase liability for third-party lender losses     $ 0
Finance receivables in non-accrual status $ 500,000 100,000  
Recency delinquency      
Accrual period for financing receivables 60 days    
Contractual delinquency      
Accrual period for financing receivables 90 days    
90+ days      
Aggregate unpaid principal balance $ 10,100,000 10,500,000  
Fair value of receivables $ 1,500,000 $ 1,500,000  
[1] (1) Includes amounts in consolidated variable interest entities ("VIEs") presented separately in the table below.