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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current [Abstract]      
Domestic $ 30,415,000us-gaap_CurrentFederalTaxExpenseBenefit $ 31,220,000us-gaap_CurrentFederalTaxExpenseBenefit $ 17,791,000us-gaap_CurrentFederalTaxExpenseBenefit
Foreign 3,740,000us-gaap_CurrentForeignTaxExpenseBenefit 1,706,000us-gaap_CurrentForeignTaxExpenseBenefit 1,362,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current 34,155,000us-gaap_CurrentIncomeTaxExpenseBenefit 32,926,000us-gaap_CurrentIncomeTaxExpenseBenefit 19,153,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract]      
Domestic (4,732,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,178,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 5,909,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign (569,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 171,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (84,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred (5,301,000)us-gaap_DeferredIncomeTaxExpenseBenefit (1,007,000)us-gaap_DeferredIncomeTaxExpenseBenefit 5,825,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision 28,854,000us-gaap_IncomeTaxExpenseBenefit 31,919,000us-gaap_IncomeTaxExpenseBenefit 24,978,000us-gaap_IncomeTaxExpenseBenefit
Cumulative undistributed earnings of foreign subsidiaries 35,200,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 25,500,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 27,600,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
Earnings before income taxes of foreign operations 11,600,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 6,400,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 4,400,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Reconciliations between taxes at the U.S. Federal income tax rate and taxes at our effective income tax rate on earnings [Abstract]      
U.S. Federal income tax rate of 35% 28,614,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 29,737,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 23,781,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in tax rate resulting from [Abstract]      
State and local income taxes, net of federal income tax benefit 2,309,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,936,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,021,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Income tax (tax benefits) attributable to foreign income (1,511,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (428,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (852,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in unrecognized tax benefits (350,000)smp_IncomeTaxReconciliationChangeInUnrecognizedTaxBenefits 0smp_IncomeTaxReconciliationChangeInUnrecognizedTaxBenefits 0smp_IncomeTaxReconciliationChangeInUnrecognizedTaxBenefits
Other non-deductible items, net 134,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther (806,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 697,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Change in valuation allowance (342,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 480,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (669,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Total income tax provision 28,854,000us-gaap_IncomeTaxExpenseBenefit 31,919,000us-gaap_IncomeTaxExpenseBenefit 24,978,000us-gaap_IncomeTaxExpenseBenefit
U.S. Federal income tax rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Deferred tax assets [Abstract]      
Inventories 17,529,000us-gaap_DeferredTaxAssetsInventory 16,801,000us-gaap_DeferredTaxAssetsInventory  
Allowance for customer returns 11,409,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances 11,622,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances  
Postretirement benefits 2,155,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 2,446,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Allowance for doubtful accounts 2,347,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,592,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Accrued salaries and benefits 10,802,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 9,110,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Capital loss 234,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 5,999,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Tax credit carryforwards 313,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 695,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Deferred gain on building sale 1,299,000us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction 1,713,000us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction  
Accrued asbestos liabilities 13,625,000smp_DeferredTaxAssetsAccruedLitigationLiabilities 9,780,000smp_DeferredTaxAssetsAccruedLitigationLiabilities  
Deferred tax assets, gross 59,713,000us-gaap_DeferredTaxAssetsGross 60,758,000us-gaap_DeferredTaxAssetsGross  
Valuation Allowance (353,000)us-gaap_DeferredTaxAssetsValuationAllowance [1] (6,694,000)us-gaap_DeferredTaxAssetsValuationAllowance [1]  
Total deferred tax assets 59,360,000us-gaap_DeferredTaxAssetsNet 54,064,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities [Abstract]      
Depreciation 7,023,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 7,583,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Promotional costs 124,000smp_DeferredTaxLiabilitiesPromotionalCosts 187,000smp_DeferredTaxLiabilitiesPromotionalCosts  
Other 738,000us-gaap_DeferredTaxLiabilitiesOther 383,000us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities 7,885,000us-gaap_DeferredIncomeTaxLiabilities 8,153,000us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets 51,475,000us-gaap_DeferredTaxAssetsLiabilitiesNet 45,911,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Current net deferred tax assets 36,534,000us-gaap_DeferredTaxAssetsNetCurrent 35,633,000us-gaap_DeferredTaxAssetsNetCurrent  
Non-current net deferred tax assets 14,941,000us-gaap_DeferredTaxAssetsNetNoncurrent 10,278,000us-gaap_DeferredTaxAssetsNetNoncurrent  
Tax valuation allowance allocated to long term deferred tax assets 400,000us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent 6,700,000us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent  
Tax valuation allowance allocated to current deferred tax assets 0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent 0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent  
Valuation allowance reductions resulting from lapse of applicable statute of limitations 6,000,000smp_ValuationAllowanceReductionsResultingFromLapseOfApplicableStatuteOfLimitations    
Valuation allowance, remaining amount 400,000smp_ValuationAllowanceRemainingAmount    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at the beginning 350,000us-gaap_UnrecognizedTaxBenefits    
Increase based on tax positions taken in the current year 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions    
Decrease based on tax positions taken in the current year (350,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions  
Balance at the ending 0us-gaap_UnrecognizedTaxBenefits 350,000us-gaap_UnrecognizedTaxBenefits  
Reduction in effective tax rate due to uncertain tax positions recognized (in hundredths) 0.43%smp_ReductionInEffectiveTaxRateDueToUncertainTaxPositionsRecognized    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 51,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2022    
Tax credit carryforward $ 300,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Foreign Tax Authority [Member] | Minimum [Member]      
Income Tax Contingency [Line Items]      
Period for statutes of limitations 2 years    
Foreign Tax Authority [Member] | Maximum [Member]      
Income Tax Contingency [Line Items]      
Period for statutes of limitations 6 years    
Canada Tax Authority [Member]      
Income Tax Contingency [Line Items]      
Open Tax Years 2010 onward    
Hong Kong Tax Authority [Member]      
Income Tax Contingency [Line Items]      
Open Tax Years 2009 onward    
Poland Tax Authority [Member]      
Income Tax Contingency [Line Items]      
Open Tax Years 2009 onward    
[1] Current net deferred tax assets are $36.6 million and $35.6 million for 2014 and 2013, respectively. Non-current net deferred tax assets are $14.9 million and $10.3 million for 2014 and 2013, respectively. The tax valuation allowance was allocated to long term deferred tax assets in the amounts of $0.4 million and $6.7 million in 2014 and 2013, respectively. None of the valuation allowance was allocated to current deferred tax assets in 2014 and 2013. The valuation allowance was reduced by $6 million due to the expiration of the statue of limitations relating to a capital loss carryover.