Changes in Product Support Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product Liability Contingency [Line Items]
Beginning balance	$ 540.7	$ 448.7	$ 372.2
Cost accruals and revenue deferrals	340.4	305.4	304.3
Payments and revenue recognized	(260.6)	(219.7)	(219.6)
Currency translation	10.0	6.3	(8.2)
Ending balance	$ 630.5	$ 540.7	$ 448.7

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard, extended warranty protection rights granted to customers, repair and maintenance contracts and related revenue deferrals.

No definition available.

Name:	pcar_WarrantyAndRepairMaintenanceReserves
Namespace Prefix:	pcar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant