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Debt (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Oct. 15, 2014 USD ($) | Dec. 31, 2013 USD ($) | Nov. 02, 2007 USD ($) | Oct. 15, 2014 Senior Notes [Member] USD ($) | Sep. 02, 2014 Senior Notes [Member] USD ($) | Dec. 31, 2014 Senior Notes [Member] USD ($) | Sep. 30, 2014 Senior Notes [Member] USD ($) | Dec. 31, 2014 Senior Notes [Member] USD ($) | Oct. 18, 2014 Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] USD ($) | Dec. 31, 2012 Senior Notes [Member] USD ($) | Oct. 04, 2010 Senior Notes [Member] USD ($) | Dec. 31, 2014 Revolving Credit Facility [Member] USD ($) | Sep. 12, 2014 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2013 Revolving Credit Facility [Member] USD ($) | Nov. 02, 2007 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2014 Revolving Credit Facility [Member] Maximum [Member] | Dec. 31, 2014 Revolving Credit Facility [Member] Minimum [Member] | Dec. 31, 2014 Line of Credit [Member] USD ($) | Dec. 31, 2014 Line of Credit [Member] SEK | Dec. 31, 2013 Line of Credit [Member] USD ($) | Feb. 25, 2014 Term Loan One [Member] CNY | Dec. 31, 2013 Term Loan One [Member] USD ($) | Dec. 31, 2014 Term Loan Two [Member] USD ($) | Oct. 17, 2014 Term Loan Two [Member] CNY | Dec. 31, 2014 Term Loan Two [Member] People's Bank of China One-Year Lending Rate [Member] | Dec. 31, 2014 PST Eletronicaltda [Member] | Dec. 31, 2014 PST Eletronicaltda [Member] Term Loan [Member] USD ($) | Jul. 01, 2014 PST Eletronicaltda [Member] Term Loan [Member] BRL | Dec. 31, 2014 PST Eletronicaltda [Member] Term Loan One [Member] | Dec. 31, 2014 PST Eletronicaltda [Member] Term Loan Two [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred financing costs |  |  |  |  |  |  |  |  | $ 535,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  | $ 100,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,666,000 us-gaap_DeferredFinanceCostsGross / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1.82%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sri_TermLoanOneMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sri_TermLoanTwoMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  | Oct. 15, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 15, 2017 | Nov. 15, 2021
Debt instrument, unamortized discount, percentage |  |  |  |  |  |  |  |  |  |  |  | 2.50%sri_DebtInstrumentUnamortizedDiscountPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 2.50%sri_DebtInstrumentUnamortizedDiscountPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  |  |  |  |  | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 2,562,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember | 20,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember | 3,107,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 sri_IncreaseInMaximumBorrowingCapacityOfCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 100,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  | 100,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding | 100,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  | 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate multiplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00%sri_InterestRatePercentOfVariableRate / us-gaap_DebtInstrumentAxis = sri_TermLoanTwoMember / us-gaap_VariableRateAxis = sri_PeopleSBankOfChinaOneYearLendingRateMember |  |  |  |  |
Face value of senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 175,000,000 us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding debt redeemed |  |  |  |  |  |  |  | 10.00%sri_PercentageOfOutstandingDebtRedeemed / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt early redemption percentage |  |  |  |  |  |  | 104.75%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 103.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 2,732,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount (premium) |  |  |  |  |  |  |  |  | 2,019,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 295,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
De-designation date unrecognized gain on interest rate swap |  |  |  |  |  |  |  |  | 348,000 us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of notes |  |  |  |  |  |  | 157,500,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 17,500,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  | 9,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanOneMember |  |  | 9,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanTwoMember |  |  |  | 17,770,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,487,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanOneMember | 1,450,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanTwoMember |  |  |  | 6,690,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
Maximum leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300.00%sri_MaximumLeverageRatio / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350.00%sri_MinimumInterestCoverageRatio / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt, net | 10,651,000 us-gaap_LongTermDebtNoncurrent |  | 10,651,000 us-gaap_LongTermDebtNoncurrent |  | 185,045,000 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: current portion | 19,655,000 us-gaap_LongTermDebtCurrent |  | 19,655,000 us-gaap_LongTermDebtCurrent |  | 12,187,000 us-gaap_LongTermDebtCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | (9,687,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | (920,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | (10,607,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  | (9,687,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | (820,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium paid on extinguishment of debt |  |  |  |  |  |  |  |  | 7,481,000 sri_PremiumPaidOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 525,000 sri_PremiumPaidOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 19,655,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  | 19,655,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,368,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2016 | 4,171,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  | 4,171,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,171,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2017 | 2,711,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  | 2,711,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,711,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2018 | 1,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  | 1,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2019 | 101,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  | 101,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,418,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 486,000 sri_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 447,000 sri_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven / us-gaap_DebtInstrumentAxis = sri_TermLoanMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |
Thereafter | $ 933,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  | $ 933,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |
Short-term debt, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.20%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |  |  |

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