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Investments (Narrative) (Details) R$ in Thousands, $ in Thousands	3 Months Ended		64 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	May 15, 2017	Dec. 31, 2020 USD ($)	Dec. 31, 2020 BRL (R$)	Mar. 31, 2020 BRL (R$)	Dec. 31, 2018 USD ($)	May 16, 2017
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 614	$ 457
Fair value and other adjustments	184	$ 39
Investment	$ 56,239			$ 53,978
MSIL
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%	49.00%				49.00%
Equity method investments	$ 14,171			13,547
Income (loss) from equity method investments	$ 430	$ 457
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%
Dividends Payable, Price Index Adjustment		$ 68				R$ 261
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%
Investment commitment				10,000			$ 10,000
Investment	$ 4,019			$ 3,436
Contribution expected period (in years)	10 years
Contribution by company	$ 650

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