Amortized Cost Basis of Finance Receivables for Other Than Insignificant Term Extensions and Payment Delays for Customers in Financial Difficulty (Detail) - Customer Retail - Customers Experiencing Financial Difficulty - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 76.3	$ 4.7
Annualized % of total retail portfolio	3.80%	0.30%
Fleet
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 76.3	$ 4.5
Owner/Operator
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.2

Amortized Cost Basis of Finance Receivables for Other Than Insignificant Term Extensions and Payment Delays for Customers in Financial Difficulty (Detail) - Customer Retail - Customers Experiencing Financial Difficulty - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Financing Receivable, Modified [Line Items]

Amortized Cost Basis

$ 76.3

$ 4.7

Annualized % of total retail portfolio

3.80%

0.30%

Fleet

Financing Receivable, Modified [Line Items]

Amortized Cost Basis

$ 76.3

$ 4.5

Owner/Operator

Financing Receivable, Modified [Line Items]

Amortized Cost Basis

$ 0.2