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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%

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