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Commitments and Contingencies (Narrative) (Details) R$ in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 12, 2020 USD ($) | Aug. 12, 2020 BRL (R$) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 BRL (R$)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability |  |  | $ 434 |  | $ 434 |  |  |  | $ 180 |
Groundwater remediation expense |  |  | 0 | $ 3 | 407 | $ 108 |  |  |  |
Product warranty and recall accrual |  |  | 3,255 |  | 3,255 |  |  |  | 3,647 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on litigation |  |  |  |  |  |  | $ 6,473 |  |  |
Accrued Expenses and Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability |  |  | 258 |  | 258 |  |  |  | 180 |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  | 1,489 |  | 1,489 |  |  |  |  |
Stoneridge Brazil [Member] | Civil, labor and other tax contingencies [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  | $ 8,296 |  | $ 8,296 |  |  | R$ 45,127 | $ 8,416 | R$ 43,736
Stoneridge Brazil [Member] | Fine [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation amount | $ 1,598 | R$ 7,995 |  |  |  |  |  |  |  |

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