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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of TDR Net Finance Receivables And TDR Allowance For Credit Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | $ 1,314,233 |  | $ 1,136,259 | $ 1,059,554 |  |
Allowance for credit losses | 150,100 | $ 139,400 | 150,000 | 144,000 | $ 142,000 | $ 62,200
Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 17,017 |  |  | 22,883 |  |
Allowance for credit losses | 5,646 |  |  | 8,371 |  |
Small Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 419,602 |  | 403,062 | 382,785 |  |
Allowance for credit losses | 57,786 | 51,578 | 59,410 | 57,016 | 58,205 | 30,588
Small Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 3,564 |  |  | 6,006 |  |
Allowance for credit losses | 1,411 |  |  | 2,403 |  |
Large Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 882,514 |  | 715,210 | 655,932 |  |
Allowance for credit losses | 90,422 | 85,649 | 87,275 | 83,002 | 79,305 | 29,148
Large Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 13,201 |  |  | 16,446 |  |
Allowance for credit losses | 4,154 |  |  | 5,775 |  |
Automobile Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 1,757 |  | 3,889 | 4,892 |  |
Allowance for credit losses | 319 | 455 | 783 | 995 | 1,160 | 820
Automobile Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 189 |  |  | 352 |  |
Allowance for credit losses | 61 |  |  | 158 |  |
Retail Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 10,360 |  | 14,098 | 15,945 |  |
Allowance for credit losses | 1,573 | $ 1,718 | $ 2,532 | 2,987 | $ 3,330 | $ 1,644
Retail Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 63 |  |  | 79 |  |
Allowance for credit losses | $ 20 |  |  | $ 35 |  |

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