Pre-Modification and Post-Modification Amortized Cost Basis (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Modifications [Line Items]
Pre-Modification Amortized cost basis	$ 0
Post-Modification Amortized cost basis	$ 0
Customer Retail
Financing Receivable, Modifications [Line Items]
Pre-Modification Amortized cost basis		$ 800,000
Post-Modification Amortized cost basis		700,000
Customer Retail | Fleet
Financing Receivable, Modifications [Line Items]
Pre-Modification Amortized cost basis		700,000
Post-Modification Amortized cost basis		600,000
Customer Retail | Owner Operator
Financing Receivable, Modifications [Line Items]
Pre-Modification Amortized cost basis		100,000
Post-Modification Amortized cost basis		$ 100,000