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Fair Value Measurements - Carrying Amount and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Net finance receivables, less unearned insurance premiums and allowance for credit losses	$ 1,790,030	$ 1,644,967
Restricted AFS investments	22,344	21,712
Level 1 [Member] | Carrying Amount [Member]
Assets
Cash	4,084	3,951
Restricted cash	104,459	131,684
Level 1 [Member] | Estimated Fair Value [Member]
Assets
Cash	4,084	3,951
Restricted cash	104,459	131,684
Level 3 [Member] | Carrying Amount [Member]
Assets
Net finance receivables, less unearned insurance premiums and allowance for credit losses	1,790,030	1,644,967
Liabilities:
Debt	1,581,992	1,478,336
Level 3 [Member] | Estimated Fair Value [Member]
Assets
Net finance receivables, less unearned insurance premiums and allowance for credit losses	1,820,986	1,695,325
Liabilities:
Debt	1,556,879	1,428,607
Level 2 [Member] | Carrying Amount [Member] | Fair Value, Recurring
Assets
Restricted AFS investments	22,344	21,712
Level 2 [Member] | Estimated Fair Value [Member] | Fair Value, Recurring
Assets
Restricted AFS investments	$ 22,344	$ 21,712

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- Definition

The fair value amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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