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Changes in Product Support Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product Warranties Disclosures [Abstract]      
Beginning balance $ 630.5pcar_WarrantyAndRepairMaintenanceReserves $ 540.7pcar_WarrantyAndRepairMaintenanceReserves $ 448.7pcar_WarrantyAndRepairMaintenanceReserves
Cost accruals and revenue deferrals 642.4pcar_WarrantyAndRepairMaintenanceReservesIncrease 479.6pcar_WarrantyAndRepairMaintenanceReservesIncrease 437.4pcar_WarrantyAndRepairMaintenanceReservesIncrease
Payments and revenue recognized (456.6)pcar_WarrantyAndRepairMaintenanceReservesDecrease (399.8)pcar_WarrantyAndRepairMaintenanceReservesDecrease (351.7)pcar_WarrantyAndRepairMaintenanceReservesDecrease
Currency translation (43.5)pcar_WarrantyAndRepairMaintenanceReservesCurrencyTranslationIncreaseDecrease 10.0pcar_WarrantyAndRepairMaintenanceReservesCurrencyTranslationIncreaseDecrease 6.3pcar_WarrantyAndRepairMaintenanceReservesCurrencyTranslationIncreaseDecrease
Ending balance $ 772.8pcar_WarrantyAndRepairMaintenanceReserves $ 630.5pcar_WarrantyAndRepairMaintenanceReserves $ 540.7pcar_WarrantyAndRepairMaintenanceReserves