XML 56 R100.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of option granted $ 8.6pcar_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 11.2pcar_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 12.0pcar_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Fair value of option vested 10.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Unrecognized compensation cost related to unvested stock 8.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Recognized over a remaining weighted-average vesting period (year) 1 year 5 months 19 days      
Stock options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration term from the grant date (in years) 10 years      
Stock options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to unvested stock $ 1.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Recognized over a remaining weighted-average vesting period (year) 1 year 3 months 18 days      
Stock granted 112,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Stock granted, weighted-average fair value $ 59.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
[1]      
Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Stock Options and Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock authorized for issuance 46,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= pcar_EmployeeStockOptionPlanAndRestrictedStockUnitsRsuMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Shares available for future grants 16,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= pcar_EmployeeStockOptionPlanAndRestrictedStockUnitsRsuMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Performance Based Restricted Equity Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)       5 years
Stock granted       187,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Stock granted, weighted-average fair value       $ 43.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
[1] Weighted Average