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Business Acquisitions and Investments, Pensacola Fuel Injection, Inc, and Annex Manufacturing Acquisiti (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2014
Apr. 30, 2014
Assets acquired and liabilities assumed [Abstract]                          
Goodwill $ 54,975,000us-gaap_Goodwill       $ 38,005,000us-gaap_Goodwill       $ 54,975,000us-gaap_Goodwill $ 38,005,000us-gaap_Goodwill $ 35,827,000us-gaap_Goodwill    
Revenues 218,054,000us-gaap_SalesRevenueGoodsNet 257,046,000us-gaap_SalesRevenueGoodsNet 272,540,000us-gaap_SalesRevenueGoodsNet 232,752,000us-gaap_SalesRevenueGoodsNet 218,708,000us-gaap_SalesRevenueGoodsNet 264,162,000us-gaap_SalesRevenueGoodsNet 270,126,000us-gaap_SalesRevenueGoodsNet 230,708,000us-gaap_SalesRevenueGoodsNet 980,392,000us-gaap_SalesRevenueGoodsNet 983,704,000us-gaap_SalesRevenueGoodsNet 948,916,000us-gaap_SalesRevenueGoodsNet    
Pensacola Fuel Injection Inc. [Member]                          
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                          
Purchase price:                 12,225,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
    12,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
 
Assets acquired and liabilities assumed [Abstract]                          
Receivables 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Inventory 2,815,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              2,815,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Property, plant and equipment, net 466,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              466,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Intangible assets 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Goodwill 12,528,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              12,528,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Current liabilities (3,584,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              (3,584,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Net assets acquired 12,225,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
              12,225,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= smp_PensacolaFuelInjectionIncMember
       
Annex Manufacturing [Member]                          
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract]                          
Purchase price:                 11,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
      11,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
Assets acquired and liabilities assumed [Abstract]                          
Receivables 2,581,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              2,581,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Inventory 2,630,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              2,630,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Property, plant and equipment, net 128,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              128,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Intangible assets 4,760,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              4,760,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Goodwill 4,567,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              4,567,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Current liabilities (3,166,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              (3,166,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Net assets acquired 11,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
              11,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Revenue reported by acquired entity for last annual period                   22,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
     
Percentage of volume from acquired business sold to parent (in hundredths)                   40.00%smp_PercentageOfVolumeFromAcquiredBusinessSoldToParent
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
     
Revenues                 8,500,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
       
Annex Manufacturing [Member] | Customer Relationships [Member]                          
Assets acquired and liabilities assumed [Abstract]                          
Intangible assets acquired in business acquisition                 4,700,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Estimated useful life of intangible assets                 7 years        
Annex Manufacturing [Member] | Non-Compete Agreements [Member]                          
Assets acquired and liabilities assumed [Abstract]                          
Intangible assets acquired in business acquisition                 $ 100,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= smp_AnnexManufacutringMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
       
Estimated useful life of intangible assets                 5 years