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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Income (loss) from equity method investments | $ 189 us-gaap_IncomeLossFromEquityMethodInvestments | $ 238 us-gaap_IncomeLossFromEquityMethodInvestments |
Noncontrolling interest | 18,321 us-gaap_MinorityInterest |  | 22,550 us-gaap_MinorityInterest
Less: loss attributable to noncontrolling interest | (409)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (978)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
PST Eletronicaltda [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage ownership in consolidated subsidiary | 74.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |  |
Noncontrolling interest | 18,321 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 39,907 us-gaap_MinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |
Foreign currency translation adjustments | (3,820)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 1,345 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |
Less: loss attributable to noncontrolling interest | (409)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 978 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |
Comprehensive income (loss) related to noncontrolling interest | (4,229)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember | 367 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_PstEletronicaltdaMember |
Minda Stoneridge Instruments Ltd [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  |
Equity method investments | 6,899 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |  | 6,653 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember
Income (loss) from equity method investments | $ 189 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember | $ 238 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = sri_MindaStoneridgeInstrumentsLtdMember |

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- Definition Amount after tax of (increase) decrease in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613674-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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