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Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Customer
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]      
Equity ownership in entities included in consolidated financial statements, minimum (in hundredths) 50.00%smp_EquityOwnershipInEntitiesIncludedInConsolidatedFinancialStatementsMinimum    
Inventory reserve $ 45,200,000us-gaap_InventoryValuationReserves $ 42,700,000us-gaap_InventoryValuationReserves  
Property, Plant and Equipment [Line Items]      
Valuation allowance 353,000us-gaap_DeferredTaxAssetsValuationAllowance [1] 6,694,000us-gaap_DeferredTaxAssetsValuationAllowance [1]  
Net deferred tax asset 51,475,000us-gaap_DeferredTaxAssetsLiabilitiesNet 45,911,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Reconciliation of the shares used in calculating basic and dilutive net earnings per common share [Abstract]      
Weighted average common shares outstanding - Basic (in shares) 22,899,516us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,974,690us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,812,077us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus incremental shares from assumed conversions [Abstract]      
Dilutive effect of restricted stock and performance shares (in shares) 335,000smp_IncrementalCommonSharesAttributableToRestrictedAndPerformanceStock 287,000smp_IncrementalCommonSharesAttributableToRestrictedAndPerformanceStock 231,000smp_IncrementalCommonSharesAttributableToRestrictedAndPerformanceStock
Dilutive effect of stock options (in shares) 5,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 8,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 7,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding - Diluted (in shares) 23,239,925us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,270,067us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,050,340us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Minimum product warranty period 90 days    
Concentration Risk [Line Items]      
Number of largest individual customers 5smp_NumberOfLargestIndividualCustomers    
Concentration risk, percentage (in hundredths) 68.00%us-gaap_ConcentrationRiskPercentage1 66.00%us-gaap_ConcentrationRiskPercentage1 64.00%us-gaap_ConcentrationRiskPercentage1
Foreign cash balance $ 10,700,000smp_ForeignCash $ 4,700,000smp_ForeignCash  
NAPA Auto Parts [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= smp_NapaAutoPartsMember		    
Benchmark percentage to consider customer as major customer (in hundredths) 19.00%smp_BenchmarkPercentageToConsiderCustomerAsMajorCustomer
/ us-gaap_MajorCustomersAxis
= smp_NapaAutoPartsMember		    
Advance Auto Parts, Inc. [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= smp_AdvanceAutoPartsIncMember		    
Benchmark percentage to consider customer as major customer (in hundredths) 16.00%smp_BenchmarkPercentageToConsiderCustomerAsMajorCustomer
/ us-gaap_MajorCustomersAxis
= smp_AdvanceAutoPartsIncMember		    
O' Reilly Automotive, Inc. [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= smp_OReillyAutomotiveIncMember		    
Benchmark percentage to consider customer as major customer (in hundredths) 19.00%smp_BenchmarkPercentageToConsiderCustomerAsMajorCustomer
/ us-gaap_MajorCustomersAxis
= smp_OReillyAutomotiveIncMember		    
AutoZone, Inc [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= smp_AutoZoneIncMember		    
Benchmark percentage to consider customer as major customer (in hundredths) 10.00%smp_BenchmarkPercentageToConsiderCustomerAsMajorCustomer
/ us-gaap_MajorCustomersAxis
= smp_AutoZoneIncMember		    
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 4,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 8,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 22,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Restricted and Performance Shares [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 276,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= smp_RestrictedAndPerformanceSharesMember		 203,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= smp_RestrictedAndPerformanceSharesMember		 200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= smp_RestrictedAndPerformanceSharesMember
Buildings [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 25 years    
Buildings [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 33 years 6 months    
Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 10 years    
Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 25 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 7 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 12 years    
Tools, Dies and Auxiliary Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Tools, Dies and Auxiliary Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 8 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life 12 years    
[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.