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Unaudited Quarterly Financial Data (Details Textual) (PST - Consolidated [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	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