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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

X

- Definition

Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Undiscounted amount of the accrual for environmental loss contingencies.

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