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Discontinued Operations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Aug. 01, 2014	Mar. 31, 2015	Mar. 31, 2014	May 26, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, gain (loss) on disposal of discontinued operation, net of tax		$ (168)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	$ (96)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Cost of sales		119,177us-gaap_CostOfGoodsSold	113,193us-gaap_CostOfGoodsSold
Sales		162,825us-gaap_SalesRevenueNet	161,331us-gaap_SalesRevenueNet
Transaction costs related to Wiring sale		46us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense	148us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
Wiring [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received for sale of business segment	71,386us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Base purchase price				65,700sri_StatedSalesPriceOfBusinessSegment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Discontinued operation, gain (loss) on disposal of discontinued operation, net of tax		(168)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember	(96)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Intercompany sales to Wiring			7,780us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Intercompany purchases from Wiring			1,875us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Cost of sales			68,407us-gaap_CostOfGoodsSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Sales			75,059us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Income tax provision on loss on disposal		(10)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember	(52)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = sri_WiringMember
Electronics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-disposition sales to Motherson acquired Wiring business		7,228sri_PostDispositionSalesToWiring / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember
Post-disposition purchases from Motherson acquired Wiring business		$ 168sri_PostDispositionPurchasesFromWiring / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember

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Total costs related to goods produced and sold during the reporting period.

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For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are initially classified as discontinued, the amounts of intercompany costs that were previously eliminated in consolidation for periods before the disposal transaction (in situations where revenue and cost producing activities with the disposed component will continue after disposal).

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