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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Rating
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Net finance receivables included net deferred origination fees   $ 12,700   $ 12,700     $ 12,600      
Number of FICO band categories | Rating       6            
Accrued interest reversed as a reduction of interest and fee income   1,800 $ 2,300 $ 6,500 $ 8,500          
Allowance for credit losses   $ 150,100 $ 144,000 $ 150,100 $ 144,000 $ 139,400 $ 150,000 $ 142,000   $ 62,200
Allowance as Percentage of Finance Receivables   11.40% 13.60% 11.40% 13.60%          
C A R E S Act | Forecast                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase in U.S. unemployment rate 7.00%                  
Net Build Related to Portfolio Growth [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase decrease in allowance for credit losses   $ 12,700 $ 3,500 $ 15,000            
Reserve Release Due to Portfolio Liquidation [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase decrease in allowance for credit losses         $ 10,200          
Expected Economic Impact of the COVID-19 Pandemic [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
COVID-19 reserves included in the allowance for credit losses       $ 15,500            
CECL Allowance [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Allowance for credit losses                 $ 122,300  
Allowance percentage of net finance receivables                 10.80%  
Quarterly Trend - Amortized Cost Basis [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Allowance for credit losses                   $ 62,200
Allowance as Percentage of Finance Receivables                   5.50%