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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Net Finance Receivables Modified And Classified As TDRs (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) Loan | Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 962 | 1,120 | 3,420 | 5,583
TDR Net Finance Receivables | $ | [1] | $ 3,534 | $ 3,561 | $ 11,603 | $ 17,273
Small Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 511 | 683 | 1,879 | 3,372
TDR Net Finance Receivables | $ | [1] | $ 1,008 | $ 2,183 | $ 3,548 | $ 10,353
Large Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 450 | 431 | 1,533 | 2,184
TDR Net Finance Receivables | $ | [1] | $ 2,524 | $ 1,359 | $ 8,032 | $ 6,821
Automobile Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  |  | 2 | 1
TDR Net Finance Receivables | $ | [1] |  |  | $ 13 | $ 3
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 1 | 6 | 6 | 26
TDR Net Finance Receivables | $ | [1] | $ 2 | $ 19 | $ 10 | $ 96
[1] | Represents the post-modification net finance receivables balance of loans that have been modified during the period and resulted in a TDR.

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- Definition The number of finance receivables modified as troubled debt restructurings. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Details
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