Commitments and Contingencies (Narrative) (Details) R$ in Thousands, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 BRL (R$)	Dec. 31, 2019 BRL (R$)
Short-term Debt [Line Items]
Environmental remediation accrued undiscounted liability	$ 196	$ 196	$ 82
Environmental remediation cost incurred	3	108
Product warranty and recall accrual	3,781	3,781	3,111
Selling, General and Administrative Expenses [Member]
Short-term Debt [Line Items]
Gain on litigation			6,473
Interest Income [Member]
Short-term Debt [Line Items]
Gain on litigation			2,392
Professional Fees [Member]
Short-term Debt [Line Items]
Gain on litigation			990
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	$ 6,800	$ 6,800	$ 7,300	R$ 37,700	R$ 29,200