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

X

- 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

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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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: