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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                          
Income tax expense (benefit) on operations $ (1,066)us-gaap_IncomeTaxExpenseBenefit $ (1,174)us-gaap_IncomeTaxExpenseBenefit $ 90us-gaap_IncomeTaxExpenseBenefit $ 294us-gaap_IncomeTaxExpenseBenefit $ 537us-gaap_IncomeTaxExpenseBenefit $ 794us-gaap_IncomeTaxExpenseBenefit $ 775us-gaap_IncomeTaxExpenseBenefit $ 691us-gaap_IncomeTaxExpenseBenefit $ (1,856)us-gaap_IncomeTaxExpenseBenefit $ 2,797us-gaap_IncomeTaxExpenseBenefit $ (33)us-gaap_IncomeTaxExpenseBenefit    
Effective income tax rate                 (3.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 12.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations    
Unremitted earnings of foreign subsidiaries 31,043us-gaap_UndistributedEarningsOfForeignSubsidiaries               31,043us-gaap_UndistributedEarningsOfForeignSubsidiaries        
Operating loss carry forwards, expiration dates                   Dec. 31, 2025      
General business and foreign tax credit carry forwards, expiration date                   Dec. 31, 2021      
Liability for uncertain tax positions reduction to noncurrent asset 3,299sri_LiabilityForUncertainTaxPositionsReductionToNoncurrentAsset               3,299sri_LiabilityForUncertainTaxPositionsReductionToNoncurrentAsset        
Liability for uncertain tax positions, noncurrent 719us-gaap_LiabilityForUncertainTaxPositionsNoncurrent               719us-gaap_LiabilityForUncertainTaxPositionsNoncurrent        
Amount affecting the Company's tax rate                 3,851us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 3,547us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate      
Gross interest and penalties expense (benefit)                 (411)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense (82)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 64us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense    
Accrued payment of interest and penalties 213us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued       624us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued       213us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 624us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued      
Goodwill impairment charge (benefit)                 51,458us-gaap_GoodwillImpairmentLoss        
State and Local Jurisdiction [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards         101,722us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		         101,722us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
General business and foreign tax credit carry forwards 1,991us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		               1,991us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		        
Foreign Tax Authority [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards                     19,887us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
General business and foreign tax credit carry forwards 1,175us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		               1,175us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		        
U.S. Federal [Member]                          
Operating Loss Carryforwards [Line Items]                          
Net operating loss carry forwards 113,901us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		               113,901us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		        
General business and foreign tax credit carry forwards $ 13,060us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		               $ 13,060us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		        
PST Eletronicaltda [Member]                          
Operating Loss Carryforwards [Line Items]                          
Equity method investment, ownership percentage                         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember
Increase in equity method investment, ownership percentage                       24.00%sri_IncreaseDecreaseInEquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember