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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of TDR Finance Receivables that Subsequently Defaulted (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
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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 |  | 502 | 559 | 1,182 | 2,445
TDR Net Finance Receivables | $ | [1] | $ 1,643 | $ 1,667 | $ 3,754 | $ 7,280
Small Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 286 | 342 | 692 | 1,506
TDR Net Finance Receivables | $ | [1] | $ 539 | $ 619 | $ 1,263 | $ 2,675
Large Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 214 | 214 | 484 | 908
TDR Net Finance Receivables | $ | [1] | $ 1,100 | $ 1,045 | $ 2,472 | $ 4,551
Automobile Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  |  | 1 |
TDR Net Finance Receivables | $ | [1] |  |  | $ 10 |
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 2 | 3 | 5 | 31
TDR Net Finance Receivables | $ | [1] | $ 4 | $ 3 | $ 9 | $ 54
[1] | Only includes defaults occurring within 12 months of a loan being designated as a TDR. Represents the corresponding balance of TDR net finance receivables at the end of the month in which they defaulted.

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- Definition Represents the number of TDR net finance receivables that defaulted within 12 months of a loan being designated as a TDR. + 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 of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
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- Details
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