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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
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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 | $ 166,811 us-gaap_SalesRevenueNet |  | $ 170,338 us-gaap_SalesRevenueNet |  | $ 162,099 us-gaap_SalesRevenueNet |  | $ 161,331 us-gaap_SalesRevenueNet |  | $ 169,235 us-gaap_SalesRevenueNet | $ 161,556 us-gaap_SalesRevenueNet | $ 169,833 us-gaap_SalesRevenueNet | $ 158,862 us-gaap_SalesRevenueNet | $ 660,579 us-gaap_SalesRevenueNet |  | $ 659,486 us-gaap_SalesRevenueNet |  | $ 612,466 us-gaap_SalesRevenueNet |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  | 469,705 us-gaap_CostOfGoodsSold |  | 453,531 us-gaap_CostOfGoodsSold |  | 427,199 us-gaap_CostOfGoodsSold |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 123,630 us-gaap_SellingGeneralAndAdministrativeExpense |  | 123,180 us-gaap_SellingGeneralAndAdministrativeExpense |  | 126,417 us-gaap_SellingGeneralAndAdministrativeExpense |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  | 16,880 sri_InterestExpenseNet |  | 18,096 sri_InterestExpenseNet |  | 19,869 sri_InterestExpenseNet |
Other expense (income), net |  |  |  |  |  |  |  |  |  |  |  |  | 565 us-gaap_OtherNonoperatingIncomeExpense |  | 1,457 us-gaap_OtherNonoperatingIncomeExpense |  | 4,606 us-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] | 957 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | [1] | (3,168)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (1,946)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (22)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 1,115 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (811)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | (4,021)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | 7,525 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |
Loss on disposal, net of tax | 890 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 6,548 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 1,138 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  | (8,576)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | (9,387)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (4,021)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 7,525 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Wiring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 167,434 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [2] | 288,344 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | 326,047 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  | 154,787 us-gaap_CostOfGoodsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [2],[3] | 268,278 us-gaap_CostOfGoodsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3] | 286,670 us-gaap_CostOfGoodsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3]
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  | 12,697 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [2],[3] | 22,765 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3] | 30,553 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [3]
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  | 69 sri_InterestExpenseNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember | [2] | 250 sri_InterestExpenseNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | 164 sri_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 |  | 289 us-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] | 8,371 us-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 |  | 7,526 us-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 |  | 7,526 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Transaction costs related to Wiring sale |  |  |  |  |  |  |  |  |  |  |  |  | 1,384 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  |  |  |  |
Management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,482 us-gaap_AssetManagementFees1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |  | 8,659 us-gaap_AssetManagementFees1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember |
Deferred foreign currency translation on disposal |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,734 us-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.

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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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