Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 11.7	$ 5.2
Financing receivable modifications percentage	0.30%	0.20%
Fleet
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 11.6	$ 5.1
Owner/Operator
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 0.1	$ 0.1

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.

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