Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Net Finance Receivables Modified And Classified As TDRs (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Loan		Dec. 31, 2021 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan			7,220		4,652
TDR Net Finance Receivables | $		$ 1,631	$ 27,494	[1]	$ 16,078	[1]
Small Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan			3,651		2,522
TDR Net Finance Receivables | $		254	$ 6,920	[1]	$ 4,761	[1]
Large Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan			3,554		2,123
TDR Net Finance Receivables | $		$ 1,377	$ 20,537	[1]	$ 11,303	[1]
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan			15		7
TDR Net Finance Receivables | $	[1]		$ 37		$ 14

[1] Represents the post-modification net finance receivables balance of loans that have been modified during the period and resulted in a TDR.