Pre- and Post-Modification Amortized Cost Basis Balances for Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	$ 7.5	$ 8.1
Post-Modification, Amortized Cost Basis	7.5	8.1
Fleet
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	7.5	8.1
Post-Modification, Amortized Cost Basis	$ 7.5	$ 8.1