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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
		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.

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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.

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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

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