Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Net sales	$ 190,365	$ 203,386	$ 222,241	$ 218,297	$ 210,814	$ 208,853	$ 220,602	$ 225,930	$ 834,289	$ 866,199	$ 824,444
Gross profit	44,198	51,855	56,827	60,853	57,959	63,285	67,418	67,969
Operating income (loss)	1,073	9,323	49,186	11,699	12,664	18,312	19,181	16,847	71,281	67,004	57,370
Income tax expense (benefit) on operations	(4,249)	1,450	9,066	1,835	690	3,467	3,820	3,233	8,102	11,210	7,533
Net income	$ 4,209	$ 6,661	$ 39,764	$ 9,657	$ 12,056	$ 13,292	$ 15,120	$ 13,380	$ 60,291	$ 53,848	$ 45,049
Earnings (loss) per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ 0.15	$ 0.24	$ 1.43	$ 0.34	$ 0.42	$ 0.47	$ 0.53	$ 0.47	$ 2.17	$ 1.90	$ 1.61
Diluted (in dollars per share)	$ 0.15	$ 0.24	$ 1.41	$ 0.33	$ 0.42	$ 0.46	$ 0.52	$ 0.46	$ 2.13	$ 1.85	$ 1.57