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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
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 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Share-based compensation options exercisable intrinsic value $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1         0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1       0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1      
Tax benefit realized from stock based compensation 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions                      
Time Based Awards [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted average grant date fair value, granted $ 6.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
$ 9.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
  $ 11.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
                   
Remaining unrecognized share-based compensation expense       3,338,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
                   
Share-based compensation vested in period, fair value 2,177,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
4,413,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= sri_TimeBasedAwardsMember
  3,509,000us-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       $ 11.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= sri_PerformanceBasedAwardsMember
                   
Remaining unrecognized share-based compensation expense       $ 1,713,000sri_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           500,000sri_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               4,500,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
3,000,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
1,500,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
3,000,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
     
Share-based compensation, increase in awards reserved for issuance of common shares                 1,500,000sri_ShareBasedCompensationIncreaseInAwardsReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
1,500,000sri_ShareBasedCompensationIncreaseInAwardsReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
       
Share-based compensation award vesting period                       3 years    
Share-based compensation restricted common shares issued       4,000,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued
/ us-gaap_PlanNameAxis
= sri_Plan2006Member
                   
Share-based compensation, maximum number of shares issuable                   500,000sri_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       2,451,700sri_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       1,548,300sri_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                     700,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_DirectorSharePlanMember
    500,000sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardReservedForIssuanceOfCommonShares
/ us-gaap_PlanNameAxis
= sri_DirectorSharePlanMember
Share-based compensation, increase in awards reserved for issuance of common shares                           200,000sri_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                           483,904sri_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedCommonSharesIssued
/ us-gaap_PlanNameAxis
= sri_DirectorSharePlanMember