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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 64 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | May 15, 2017 | Dec. 31, 2020 USD ($) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2018 USD ($) | May 16, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments | $ 584 | $ 330 | $ 1,694 | $ 556 |  |  |  |  |
Fair value and other adjustments | 176 | $ 307 | 374 | $ 168 |  |  |  |  |
Investment | $ 53,002 |  | $ 53,002 |  |  | $ 53,978 |  |  |
MSIL |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 49.00% | 49.00% | 49.00% | 49.00% |  |  |  |  |
Equity method investments | $ 14,859 |  | $ 14,859 |  |  | 13,547 |  |  |
Income (loss) from equity method investments | $ 408 | $ 330 | $ 1,320 | $ 556 |  |  |  |  |
Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  |  |  |  | 74.00% |  |  |  |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  |  |  |  | 26.00%
Stoneridge Brazil [Member] | Noncontrolling interest |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  |  | 6,010 | R$ 24,154 |  |
Autotech Ventures [Member] | Venture Capital Funds [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 6.60% |  | 6.60% |  |  |  |  |  |
Investment commitment |  |  |  |  |  | 10,000 |  | $ 10,000 |
Investment | $ 6,159 |  | $ 6,159 |  |  | $ 3,436 |  |  |
Contribution expected period (in years) |  |  | 10 years |  |  |  |  |  |
Contribution |  |  | $ 2,600 | $ 750 |  |  |  |  |
Proceeds from other investments |  |  | $ 251 |  |  |  |  |  |

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