Investments in Marketable Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Net realized losses on marketable equity securities	$ 5,200,000	$ 0
Allowance for credit losses	0	0
Truck, Parts and Other
Schedule Of Available For Sale Securities [Line Items]
Gross realized gains from sales of marketable debt securities	500,000	2,100,000	$ 2,700,000
Gross realized loss from sales of marketable debt securities	$ 2,300,000	$ 400,000	$ 300,000