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Stockholder's Equity - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
[1]
Equity [Abstract]    
Preferred stock dividend percentage 6.00%  
Ownership percentage of PACCAR 100.00%  
Accumulated other comprehensive (loss) income $ (3.0) $ 0.8
[1] The December 31, 2018 balance sheet has been derived from audited financial statements.