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Investments (Details) (Pst Eletronica Ltda [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2011
Pst Eletronica Ltda [Member] |  |
Net sales | $ 65,638 | $ 181,854
Cost of goods sold | 37,965 | 103,466
Total income before income taxes | 2,245 | 10,175
Stoneridge, Inc.'s share of income before income taxes | $ 1,123 | $ 5,087

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