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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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