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Business Acquisitions and Investments, Gwo Yng Enterprise Co., Ltd. Equity Investment (Details) (Gwo Yng Enterprise Co. [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2014
Gwo Yng Enterprise Co. [Member]
 
Business Acquisition [Line Items]  
Percentage of minority interest acquired (in hundredths) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= smp_GwoYngEnterpriseCoMember
Purchase price of business $ 14.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= smp_GwoYngEnterpriseCoMember