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Inventories Table (Detail) (Truck, Parts and Other, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Truck, Parts and Other
   
Inventory [Line Items]    
Finished products $ 504.0us-gaap_InventoryFinishedGoods
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
$ 512.3us-gaap_InventoryFinishedGoods
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
Work in process and raw materials 536.6us-gaap_InventoryWorkInProcessAndRawMaterials
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
587.7us-gaap_InventoryWorkInProcessAndRawMaterials
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
Inventory, Gross, Total 1,040.6us-gaap_InventoryGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
1,100.0us-gaap_InventoryGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
Less LIFO reserve (174.9)us-gaap_InventoryLIFOReserve
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
(174.3)us-gaap_InventoryLIFOReserve
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
Inventories, net $ 865.7us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
$ 925.7us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_TruckPartsAndOtherMember
[1]
[1] The December 31, 2014 consolidated balance sheet has been derived from audited financial statements.