v3.26.1
Stockholder's Equity - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
[1]
Equity [Abstract]    
Preferred stock dividend percentage 6.00%  
Ownership percentage of PACCAR 100.00%  
Accumulated other comprehensive income $ 4.5 $ 3.7
[1] The December 31, 2025 balance sheet has been derived from audited financial statements.