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Acquired Intangible Assets (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 57,126,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross   $ 57,299,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
Less accumulated amortization (25,373,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [1]   (24,120,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [1]
Net acquired intangible assets 31,753,000us-gaap_FiniteLivedIntangibleAssetsNet   33,179,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization of acquired intangible assets [Abstract]      
Amortization expense 1,300,000us-gaap_AmortizationOfIntangibleAssets 1,100,000us-gaap_AmortizationOfIntangibleAssets  
Estimated amortization expense, remainder of current year 3,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
Estimated amortization expense in year 2016 4,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Estimated amortization expense in year 2017 4,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Estimated amortization expense in years 2018 through 2028 13,500,000smp_FiniteLivedIntangibleAssetsAmortizationExpenseRemainingYears    
Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 48,473,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		   48,646,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trademarks and Trade Names [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 6,800,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		   6,800,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Intangible assets acquired [Abstract]      
Amount of acquired indefinite-lived intangible assets 5,200,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		    
Non-compete Agreements [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 970,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		   970,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Patents and Supply Contracts [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets 723,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= smp_PatentsAndSupplyContractsMember		   723,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= smp_PatentsAndSupplyContractsMember
Leaseholds [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Total acquired intangible assets $ 160,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember		   $ 160,000smp_AcquiredFiniteLivedIntangibleAssetAmountGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember
[1] Applies to all intangible assets, except for related trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.