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Summary of Significant Accounting Policies (Statements of Operations for Discontinued Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net sales $ 166,811us-gaap_SalesRevenueNet $ 170,338us-gaap_SalesRevenueNet $ 162,099us-gaap_SalesRevenueNet $ 161,331us-gaap_SalesRevenueNet $ 169,235us-gaap_SalesRevenueNet $ 161,556us-gaap_SalesRevenueNet $ 169,833us-gaap_SalesRevenueNet $ 158,862us-gaap_SalesRevenueNet $ 660,579us-gaap_SalesRevenueNet $ 659,486us-gaap_SalesRevenueNet $ 612,466us-gaap_SalesRevenueNet
Cost of goods sold                 469,705us-gaap_CostOfGoodsSold 453,531us-gaap_CostOfGoodsSold 427,199us-gaap_CostOfGoodsSold
Selling, general and administrative                 123,630us-gaap_SellingGeneralAndAdministrativeExpense 123,180us-gaap_SellingGeneralAndAdministrativeExpense 126,417us-gaap_SellingGeneralAndAdministrativeExpense
Interest expense, net                 16,880sri_InterestExpenseNet 18,096sri_InterestExpenseNet 19,869sri_InterestExpenseNet
Other expense (income), net                 565us-gaap_OtherNonoperatingIncomeExpense 1,457us-gaap_OtherNonoperatingIncomeExpense 4,606us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from discontinued operations, net of tax (1,692)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax [1] (8,108)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax [1] (544)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax [1] 957us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax [1] (3,168)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (1,946)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (22)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 1,115us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (811)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax (4,021)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 7,525us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Loss on disposal, net of tax 890us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 6,548us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 1,138us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax           (8,576)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax    
Income (loss) from discontinued operations                 (9,387)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (4,021)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 7,525us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Wiring [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Net sales                 167,434us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] 288,344us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 326,047us-gaap_SalesRevenueNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Cost of goods sold                 154,787us-gaap_CostOfGoodsSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2],[3] 268,278us-gaap_CostOfGoodsSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3] 286,670us-gaap_CostOfGoodsSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3]
Selling, general and administrative                 12,697us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2],[3] 22,765us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3] 30,553us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3]
Interest expense, net                 69sri_InterestExpenseNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] 250sri_InterestExpenseNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 164sri_InterestExpenseNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Other expense (income), net                 (58)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] (357)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 289us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Income (loss) from operations of discontinued operations before income taxes                 (61)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2],[3],[4] (2,592)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3],[4] 8,371us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [3],[4]
Income tax provision on discontinued operations                 (750)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] (1,429)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 (845)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Income (loss) from discontinued operations, net of tax                 (811)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] (4,021)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 7,526us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Loss on disposal                 (6,955)sri_GrossLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2],[5]    
Income tax provision on loss on disposal                 (1,621)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2]    
Loss on disposal, net of tax (795)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		               (8,576)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2]    
Income (loss) from discontinued operations                 (9,387)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 [2] (4,021)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 7,526us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Transaction costs related to Wiring sale                 1,384us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		    
Management fees                   7,482us-gaap_AssetManagementFees1
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		 8,659us-gaap_AssetManagementFees1
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember
Deferred foreign currency translation on disposal                 $ 2,734us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sri_WiringMember		    
[1] A loss on disposal of the Wiring business was recorded for $1,138, $6,548 and $890 for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively.
[2] The operations of the Wiring business were presented only for the seven months ended July 31, 2014 as the sale wascompleted on August 1, 2014.
[3] The assets and liabilities of the Wiring business were reclassified as held for sale effective May 26, 2014. Accordingly,depreciation and amortization for the related Wiring assets were not recorded after that date.
[4] Management fees, which had been reported in the Wiring business in prior periods, of $7,482 and $8,659 for the years ended December 31, 2013 and 2012, respectively, have been excluded as they are not directly attributable to the business.
[5] Included in loss on disposal for the year ended December 31, 2014 were transaction costs of $1,384 and $2,734 in previously deferred foreign currency translation.