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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 | $ 90 us-gaap_IncomeTaxExpenseBenefit | $ 294 us-gaap_IncomeTaxExpenseBenefit | $ 537 us-gaap_IncomeTaxExpenseBenefit | $ 794 us-gaap_IncomeTaxExpenseBenefit | $ 775 us-gaap_IncomeTaxExpenseBenefit | $ 691 us-gaap_IncomeTaxExpenseBenefit | $ (1,856)us-gaap_IncomeTaxExpenseBenefit | $ 2,797 us-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 | 31,043 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  | 31,043 us-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 | 3,299 sri_LiabilityForUncertainTaxPositionsReductionToNoncurrentAsset |  |  |  |  |  |  |  | 3,299 sri_LiabilityForUncertainTaxPositionsReductionToNoncurrentAsset |  |  |  |
Liability for uncertain tax positions, noncurrent | 719 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |  |  |  |  |  |  | 719 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |  |  |
Amount affecting the Company's tax rate |  |  |  |  |  |  |  |  | 3,851 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 3,547 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  |  |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | (411)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (82)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 64 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |  |
Accrued payment of interest and penalties | 213 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  | 624 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  | 213 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 624 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  | 51,458 us-gaap_GoodwillImpairmentLoss |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards |  |  |  |  | 101,722 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |  | 101,722 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
General business and foreign tax credit carry forwards | 1,991 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |  |  |  |  | 1,991 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards |  |  |  |  |  |  |  |  |  |  | 19,887 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
General business and foreign tax credit carry forwards | 1,175 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |  |  |  |  |  | 1,175 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 113,901 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |  |  |  |  | 113,901 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |
General business and foreign tax credit carry forwards | $ 13,060 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |  |  |  |  | $ 13,060 us-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 |

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