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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 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables | $ 1,676,230 | $ 1,699,393 | $ 1,446,071 |
TDR Allowance for Credit Losses | 183,800 | 178,800 | 158,800 | $ 159,300
Troubled Debt Restructurings [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables |  |  | 16,602 |
TDR Allowance for Credit Losses |  |  | 4,879 |
Small Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables | 456,313 | 481,605 | 438,153 |
TDR Allowance for Credit Losses | 62,112 | 57,915 | 58,330 | 61,294
Small Loans [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables |  |  | 3,249 |
TDR Allowance for Credit Losses |  |  | 1,078 |
Large Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables | 1,211,836 | 1,208,185 | 997,226 |
TDR Allowance for Credit Losses | 120,382 | 119,592 | 98,933 | 96,494
Large Loans [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables |  |  | 13,295 |
TDR Allowance for Credit Losses |  |  | 3,782 |
Retail Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables | 8,081 | 9,603 | 10,692 |
TDR Allowance for Credit Losses | $ 1,306 | $ 1,293 | 1,537 | $ 1,512
Retail Loans [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net finance receivables |  |  | 58 |
TDR Allowance for Credit Losses |  |  | $ 19 |

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