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Acquisition of Orlaco (Pro Forma Results of Operations) (Details) - Orlaco [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 209,111 | $ 201,397 | $ 418,452 | $ 378,892
Net income attributable to Stoneridge, Inc. and subsidiaries | $ 9,019 | $ 12,889 | $ 18,326 | $ 21,789

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