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Share-Based Compensation Plans (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 128 Months Ended | 1 Months Ended | 8 Months Ended | 12 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2014 | May 31, 2012 | May 31, 2002 | Dec. 31, 2012 | May 31, 2013 | May 31, 2010 | Apr. 30, 2006 | Dec. 31, 2013 | Dec. 31, 2009 | Dec. 31, 2010 | Apr. 30, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award, number of shares available for grant | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |
Share-based compensation options exercisable intrinsic value | $ 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | $ 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  | 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  | 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |
Tax benefit realized from stock based compensation | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  |  |  |  |  |  |  |  |  |  |
Time Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, granted | $ 6.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember | $ 9.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember |  | $ 11.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Remaining unrecognized share-based compensation expense |  |  |  | 3,338,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Share-based compensation vested in period, fair value | 2,177,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember | 4,413,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember |  | 3,509,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  | 1 year 2 months 16 days |  |  |  |  |  |  |  |  |  |
Performance Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of performance shares vested upon Company attaining performance targets against a peer group |  |  |  | 20.00%sri_PercentOfPerformanceSharesVestedUponCompanyAttainingPerformanceTargetsAgainstPeerGroup / us-gaap_AwardTypeAxis = sri_PerformanceBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Percent of performance shares vested upon achieving annual earnings per share targets |  |  |  | 80.00%sri_PercentOfPerformanceSharesVestedUponAchievingAnnualNetIncomePerShareTargets / us-gaap_AwardTypeAxis = sri_PerformanceBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, granted |  |  |  | $ 11.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = sri_PerformanceBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Remaining unrecognized share-based compensation expense |  |  |  | $ 1,713,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValue / us-gaap_AwardTypeAxis = sri_PerformanceBasedAwardsMember |  |  |  |  |  |  |  |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  | 1 year 4 months |  |  |  |  |  |  |  |  |  |
Plan 2002 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  |  |  |  |  | 500,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2002Member |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Share-based compensation expiration date |  |  |  |  | May 31, 2012 |  |  |  |  |  |  |  |  |
Options grant date contractual life |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Plan 2006 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  |  |  |  |  |  |  | 4,500,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member | 3,000,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member | 1,500,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member | 3,000,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |
Share-based compensation, increase in awards reserved for issuance of common shares |  |  |  |  |  |  |  |  | 1,500,000 sri_ShareBasedCompensationIncreaseInAwardsReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member | 1,500,000 sri_ShareBasedCompensationIncreaseInAwardsReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Share-based compensation restricted common shares issued |  |  |  | 4,000,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |  |  |  |  |  |  |  |
Share-based compensation, maximum number of shares issuable |  |  |  |  |  |  |  |  |  | 500,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesMayBeIssued / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |  |
Plan 2006 [Member] | Time Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  | 3 years | 3 years |  |  |  |  |  |  |  |  |  | 3 years |
Share-based compensation restricted common shares issued |  |  |  | 2,451,700 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued / us-gaap_AwardTypeAxis = sri_TimeBasedAwardsMember / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |  |  |  |  |  |  |  |
Plan 2006 [Member] | Performance Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  | 3 years | 3 years |  |  |  |  |  |  |  |  |  | 3 years |
Share-based compensation restricted common shares issued |  |  |  | 1,548,300 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued / us-gaap_AwardTypeAxis = sri_PerformanceBasedAwardsMember / us-gaap_PlanNameAxis = sri_Plan2006Member |  |  |  |  |  |  |  |  |  |
Director Share Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  |  |  |  |  |  |  |  |  |  | 700,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_DirectorSharePlanMember |  |  | 500,000 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_DirectorSharePlanMember
Share-based compensation, increase in awards reserved for issuance of common shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 sri_ShareBasedCompensationIncreaseInAwardsReservedForIssuanceOfCommonShares / us-gaap_PlanNameAxis = sri_DirectorSharePlanMember
Share-based compensation award vesting period | 1 year | 1 year | 1 year |  |  |  |  |  |  |  |  |  | 1 year |
Share-based compensation restricted common shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 483,904 sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued / us-gaap_PlanNameAxis = sri_DirectorSharePlanMember

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- Definition Percent of performance shares vested upon Company attaining performance targets against a peer group + References No definition available. + Details
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- Definition The value represents the total of unrecognized compensation cost related to nonvested time based restricted common share awards granted. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum number of share instruments may be issued under a share-based compensation plan subject to incentive stock options. + References No definition available. + Details
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- Definition Number of shares reserved for issuance of common shares under an established share-based compensation plan. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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