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Restructuring (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
PST Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 0 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |  |
Business realignment charges | 1,578 sri_BusinessRealignmentCharges / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |  | 1,646 sri_BusinessRealignmentCharges / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |
Wiring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense |  | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_WiringMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_WiringMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_WiringMember
Electronics [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 494 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 469 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 256 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |
Restructuring reserve | 733 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 780 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 765 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 1,920 us-gaap_RestructuringReserve / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember
Restructuring expense | 494 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 469 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 256 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |
Control Devices [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense |  | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ControlDevicesMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ControlDevicesMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = sri_ControlDevicesMember
Facility Closing [Member] | Electronics [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 733 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 780 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |
Facility Closing [Member] | Other Noncurrent Liabilities [Member] | Electronics [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 402 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 427 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |
Selling, General and Administrative Expenses [Member] | PST Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Business realignment charges | 559 sri_BusinessRealignmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |  | 579 sri_BusinessRealignmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |
Cost of Sales [Member] | PST Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Business realignment charges | $ 847 sri_BusinessRealignmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |  | $ 729 sri_BusinessRealignmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementBusinessSegmentsAxis = sri_PstSegmentMember |

X
- Definition Amount of business realignment charges. + References No definition available. + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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Balance Type: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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