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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic Net Earnings Per Common Shares [Abstract]    
Earnings from continuing operations $ 9,339us-gaap_IncomeLossFromContinuingOperations $ 12,407us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operation (391)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (682)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net earnings available to common stockholders 8,948us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 11,725us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding (in shares) 22,910,889us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,947,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Earnings from continuing operations per common share (in dollars per share) $ 0.41us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.54us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss from discontinued operations per common share (in dollars per share) $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net earnings per common share - Basic (in dollars per share) $ 0.39us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic
Diluted Net Earnings Per Common Share [Abstract]    
Earnings from continuing operations 9,339us-gaap_IncomeLossFromContinuingOperations 12,407us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operation (391)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (682)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net earnings available to common stockholders $ 8,948us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 11,725us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Plus incremental shares from assumed conversions [Abstract]    
Dilutive effect of restricted stock and performance stock (in shares) 323,000smp_IncrementalCommonSharesAttributableToRestrictedAndPerformanceStock 272,000smp_IncrementalCommonSharesAttributableToRestrictedAndPerformanceStock
Dilutive effect of stock options (in shares) 4,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 6,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding - Diluted (in shares) 23,238,050us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,224,698us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings from continuing operations per common share (in dollars per share) $ 0.40us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.53us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss from discontinued operations per common share (in dollars per share) $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net earnings per common share - Diluted (in dollars per share) $ 0.39us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted
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) 3,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
6,000us-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) 358,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= smp_RestrictedAndPerformanceBasedSharesMember
308,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= smp_RestrictedAndPerformanceBasedSharesMember