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Inventories Table (Detail) (Truck, Parts and Other, USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Truck, Parts and Other
   
Inventory [Line Items]    
Finished products $ 480.6 $ 432.0
Work in process and raw materials 583.4 519.8
Inventory, Gross, Total 1,064.0 951.8
Less LIFO reserve (170.9) (169.4)
Inventories, net $ 893.1 $ 782.4 [1]
[1] The December 31, 2012 consolidated balance sheet has been derived from audited financial statements.