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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
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                 $ 535,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		             $ 100,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                                    
Capitalized deferred financing costs                               1,666,000us-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           100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity                     300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		   100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		     2,562,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember		 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember		 3,107,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember		                    
Increase in maximum borrowing capacity of credit facility                                 80,000,000sri_IncreaseInMaximumBorrowingCapacityOfCreditFacility
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		                                  
Borrowings outstanding 100,000,000us-gaap_LineOfCreditFacilityAmountOutstanding   100,000,000us-gaap_LineOfCreditFacilityAmountOutstanding 100,000,000us-gaap_LineOfCreditFacilityAmountOutstanding                       100,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		   0us-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                         175,000,000us-gaap_SecuredLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 175,000,000us-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                 0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   2,732,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                                          
Amortization of debt discount (premium)                 2,019,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 295,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                                                
De-designation date unrecognized gain on interest rate swap                 348,000us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                                                  
Redemption of notes             157,500,000us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 17,500,000us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                                                    
Debt, face amount                             175,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                   9,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanOneMember		     9,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanTwoMember		       17,770,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		    
Debt outstanding                                                   1,487,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanOneMember		 1,450,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanTwoMember		       6,690,000us-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 10,651,000us-gaap_LongTermDebtNoncurrent   10,651,000us-gaap_LongTermDebtNoncurrent   185,045,000us-gaap_LongTermDebtNoncurrent                                                          
Less: current portion 19,655,000us-gaap_LongTermDebtCurrent   19,655,000us-gaap_LongTermDebtCurrent   12,187,000us-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                 7,481,000sri_PremiumPaidOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 525,000sri_PremiumPaidOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		                                                
2015 19,655,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths   19,655,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths                                                       17,368,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2016 4,171,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo   4,171,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo                                                       4,171,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2017 2,711,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree   2,711,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree                                                       2,711,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2018 1,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour   1,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                                                       1,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2019 101,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive   101,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive                                                       1,418,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2020                                                             486,000sri_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
2021                                                             447,000sri_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven
/ us-gaap_DebtInstrumentAxis
= sri_TermLoanMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sri_PstEletronicaltdaMember		      
Thereafter $ 933,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive   $ 933,000us-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