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Summary of Significant Accounting Policies (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | $ 54,348 us-gaap_Goodwill | $ 54,348 us-gaap_Goodwill | $ 62,208 us-gaap_Goodwill
Acquisition of business |  |  |  |  | 664 us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill impairment charge (benefit) |  |  |  |  | (51,458)us-gaap_GoodwillImpairmentLoss |
Currency translation |  |  |  |  | (2,476)us-gaap_GoodwillTranslationAdjustments | (7,860)us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance | 1,078 us-gaap_Goodwill |  |  |  | 1,078 us-gaap_Goodwill | 54,348 us-gaap_Goodwill
Electronics [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 604 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 604 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 598 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember
Acquisition of business |  |  |  |  | 664 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |
Currency translation |  |  |  |  | (190)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 6 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember
Goodwill, ending balance | 1,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember |  |  |  | 1,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember | 604 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_ElectronicsMember
Control Devices [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  |  |  |
Currency translation |  |  |  |  |  |
Goodwill, ending balance |  |  |  |  |  |
PST [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 53,744 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | 53,744 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | 61,610 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember
Goodwill impairment charge (benefit) | (27,960)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | 5,802 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | (29,300)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | (23,498)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | (51,458)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |
Currency translation |  |  |  |  | (2,286)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember | (7,866)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember
Goodwill, ending balance |  |  |  |  |  | $ 53,744 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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