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Finance Receivables by Credit Quality Indicator and Portfolio Class (Detail) (Financial Services, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables $ 9,065.1us-gaap_NotesReceivableGross $ 8,820.1us-gaap_NotesReceivableGross
Pass
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 8,970.7us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember		 8,713.0us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
Special Mention
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 45.8us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember		 56.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
Substandard
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 48.6us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember		 50.6us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
Dealer | Wholesale
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,755.8us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember		 1,616.5us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember
Dealer | Wholesale | Pass
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,739.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember		 1,576.9us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember
Dealer | Wholesale | Special Mention
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 11.4us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember		 31.1us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember
Dealer | Wholesale | Substandard
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 4.9us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember		 8.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_WholesaleMember
Dealer | Retail
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,606.5us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember		 1,525.6us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember
Dealer | Retail | Pass
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,606.4us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember		 1,520.1us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember
Dealer | Retail | Special Mention
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 0.1us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember		 5.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_DealerMember
/ us-gaap_SubsegmentsAxis
= pcar_RetailMember
Customer Retail | Fleet
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 4,487.5us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember		 4,442.5us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember
Customer Retail | Fleet | Pass
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 4,430.9us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember		 4,396.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember
Customer Retail | Fleet | Special Mention
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 21.8us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember		 12.7us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember
Customer Retail | Fleet | Substandard
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 34.8us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember		 33.3us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_FleetMember
Customer Retail | Owner/Operator
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,215.3us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember		 1,235.5us-gaap_NotesReceivableGross
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember
Customer Retail | Owner/Operator | Pass
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 1,193.9us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember		 1,219.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember
Customer Retail | Owner/Operator | Special Mention
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables 12.5us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember		 7.2us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember
Customer Retail | Owner/Operator | Substandard
    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivables $ 8.9us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember		 $ 8.8us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcar_FinancialServicesMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= pcar_CustomerRetailMember
/ us-gaap_SubsegmentsAxis
= pcar_OwnerOperatorMember