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v2.4.1.9

Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expenses related to employee benefit plans | $ 1,280 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1,173 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1,122 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Long Term Cash Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation liability | 245 us-gaap_DeferredCompensationLiabilityCurrent / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember |  |
Awards granted under the LTCIP | $ 0 us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember |  | $ 0 us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount / us-gaap_AwardTypeAxis = sri_LongTermCashIncentivePlanMember

X
- Definition Amount of commitment made to pay deferred cash remuneration. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 + Details
Name: | us-gaap_DeferredCompensationLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=sri_LongTermCashIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |