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Summary of Significant Accounting Policies (Schedule of Acquired Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | $ 69,287 us-gaap_FiniteLivedIntangibleAssetsGross | $ 78,047 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization | (12,650)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (9,549)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net (Excluding Goodwill), Total | 56,637 us-gaap_IntangibleAssetsNetExcludingGoodwill | 68,498 us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer Lists [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 33,686 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 37,736 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Accumulated amortization | (6,687)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | (5,031)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible Assets, Net (Excluding Goodwill), Total | 26,999 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 32,705 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Trademarks [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 22,224 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 25,143 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Accumulated amortization | (3,338)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | (2,514)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Intangible Assets, Net (Excluding Goodwill), Total | 18,886 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 22,629 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 13,327 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember | 15,111 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember
Accumulated amortization | (2,575)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember | (1,947)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember
Intangible Assets, Net (Excluding Goodwill), Total | 10,752 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember | 13,164 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = sri_TechnologyMember
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition cost | 50 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 57 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated amortization | (50)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (57)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible Assets, Net (Excluding Goodwill), Total |  |

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