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Unaudited Quarterly Financial Data (Details Textual) (PST - Consolidated [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
PST - Consolidated [Member] |
Business Acquisition One Time Non Cash Gain Ater Tax | $ 42.5

X
- Definition Amount of one-time non-cash gain after tax resulted in obtaining a controlling interest. + References No definition available. + Details
Name: | sri_BusinessAcquisitionOneTimeNonCashGainAfterTax
Namespace Prefix: | sri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration