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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 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | $ 1,183,387 |  | $ 1,136,259 | $ 1,022,635 |  |
Allowance for credit losses | 139,400 | $ 139,600 | 150,000 | 142,000 | $ 142,400 | $ 62,200
Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 17,576 |  |  | 25,474 |  |
Allowance for credit losses | 5,969 |  |  | 9,185 |  |
Small Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 380,780 |  | 403,062 | 380,083 |  |
Allowance for credit losses | 51,578 | 53,673 | 59,410 | 58,205 | 62,454 | 30,588
Small Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 3,844 |  |  | 7,162 |  |
Allowance for credit losses | 1,576 |  |  | 2,883 |  |
Large Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 789,743 |  | 715,210 | 618,134 |  |
Allowance for credit losses | 85,649 | 83,345 | 87,275 | 79,305 | 75,013 | 29,148
Large Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 13,441 |  |  | 17,825 |  |
Allowance for credit losses | 4,278 |  |  | 6,085 |  |
Automobile Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 2,303 |  | 3,889 | 6,059 |  |
Allowance for credit losses | 455 | 604 | 783 | 1,160 | 1,247 | 820
Automobile Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 224 |  |  | 402 |  |
Allowance for credit losses | 88 |  |  | 179 |  |
Retail Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 10,561 |  | 14,098 | 18,359 |  |
Allowance for credit losses | 1,718 | $ 1,978 | $ 2,532 | 3,330 | $ 3,686 | $ 1,644
Retail Loans [Member] | Troubled Debt Restructurings |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net finance receivables | 67 |  |  | 85 |  |
Allowance for credit losses | $ 27 |  |  | $ 38 |  |

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