Pre- and Post-Modification Amortized Cost Basis Balances for Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	$ 0.6
Post-Modification, Amortized Cost Basis	0.6
Fleet
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	0.6
Post-Modification, Amortized Cost Basis	0.6
Owner/Operator
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	0.0
Post-Modification, Amortized Cost Basis	$ 0.0