Transactions with PACCAR and Affiliates - Additional Information (Detail) $ in Millions	Mar. 31, 2022 USD ($) Facility
Related Party Transaction [Line Items]
Required ratio of net earnings available for fixed charges to fixed charges	125.00%
Number of facilities leased by company | Facility	4
Foreign Finance Affiliates
Related Party Transaction [Line Items]
Loans to foreign affiliates, upper limit | $	$ 750.0