Interest Income Recognized on Cash Basis for Finance Receivables that are on Non-accrual Status (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest income recognized on cash basis for finance receivables that are on non-accrual status	$ 0.7	$ 0.7	$ 1.3
Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest income recognized on cash basis for finance receivables that are on non-accrual status	0.5	0.6	1.2
Owner/Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest income recognized on cash basis for finance receivables that are on non-accrual status	$ 0.2	$ 0.1	$ 0.1