Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended			9 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Net sales	$ 166,811		$ 170,338		$ 162,099		$ 161,331		$ 169,235		$ 161,556		$ 169,833		$ 158,862		$ 660,579	$ 659,486	$ 612,466
Gross profit	44,901		49,550		48,285		48,138		50,643		49,729		54,303		51,280
Operating income	(22,795)	[1]	13,759	[1]	(23,221)	[1]	6,434	[1]	9,558		12,602		11,752		8,491		(25,823)	42,403	19,905
Provision (benefit) for income taxes	(1,066)		(1,174)		90		294		537		794		775		691		(1,856)	2,797	(33)
Income (loss) from continuing operations	(31,306)	[2]	9,138	[2]	(28,569)	[2]	(467)	[2]	3,489		7,459		6,413		3,168		(51,204)	20,529	(3,777)
Income (loss) from discontinued operations, net of tax	(1,692)	[3]	(8,108)	[3]	(544)	[3]	957	[3]	(3,168)		(1,946)		(22)		1,115		(811)	(4,021)	7,525
Net income (loss)	(32,998)	[1],[2]	1,030	[1],[2]	(29,113)	[1],[2]	490	[1],[2]	321		5,513		6,391		4,283		(60,591)	16,508	3,748
Less: income (loss) attributable to noncontrolling interest	(6,444)	[1]	1,160	[1]	(7,221)	[1]	(978)	[1]	117		466		634		160		(13,483)	1,377	(1,613)
Net income (loss) attributable to Stoneridge, Inc.	(26,554)	[1],[2],[4]	(130)	[1],[2],[4]	(21,892)	[1],[2],[4]	1,468	[1],[2],[4]	204		5,047		5,757		4,123		(47,108)	15,131	5,361
Earnings (loss) per share attributable to continuing operations attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ (0.92)	[5]	$ 0.30	[5]	$ (0.79)	[5]	$ 0.02	[5]	$ 0.13	[5]	$ 0.26	[5]	$ 0.22	[5]	$ 0.11	[5]	$ (1.40)	$ 0.72	$ (0.08)
Diluted (in dollars per share)	$ (0.92)	[5]	$ 0.29	[5]	$ (0.79)	[5]	$ 0.02	[5]	$ 0.12	[5]	$ 0.26	[5]	$ 0.21	[5]	$ 0.11	[5]	$ (1.40)	$ 0.70	$ (0.08)
Earnings (loss) per share attributable to discontinued operations:
Basic (in dollars per share)	$ (0.07)	[5]	$ (0.30)	[5]	$ (0.02)	[5]	$ 0.03	[5]	$ (0.12)	[5]	$ (0.07)	[5]	$ 0.00	[5]	$ 0.04	[5]	$ (0.35)	$ (0.15)	$ 0.28
Diluted (in dollars per share)	$ (0.07)	[5]	$ (0.29)	[5]	$ (0.02)	[5]	$ 0.03	[5]	$ (0.11)	[5]	$ (0.07)	[5]	$ 0.00	[5]	$ 0.04	[5]	$ (0.35)	$ (0.14)	$ 0.28
Earnings (loss) per share attributable to Stoneridge, Inc.:
Basic (in dollars per share)	$ (0.99)	[5]	$ 0.00	[5]	$ (0.81)	[5]	$ 0.05	[5]	$ 0.01	[5]	$ 0.19	[5]	$ 0.22	[5]	$ 0.15	[5]	$ (1.75)	$ 0.57	$ 0.20
Diluted (in dollars per share)	$ (0.99)	[5]	$ 0.00	[5]	$ (0.81)	[5]	$ 0.05	[5]	$ 0.01	[5]	$ 0.19	[5]	$ 0.21	[5]	$ 0.15	[5]	$ (1.75)	$ 0.56	$ 0.20
Goodwill impairment charge (benefit)																	51,458
Goodwill impairment loss (gain) attributable to noncontrolling interest	6,142
(Loss) on early extinguishment of debt	(9,687)		(920)														(10,607)
Loss on disposal, net of tax	890		6,548		1,138												(8,576)
PST [Member]
Earnings (loss) per share attributable to Stoneridge, Inc.:
Goodwill impairment charge (benefit)	27,960		(5,802)		29,300												51,458			23,498
Goodwill impairment loss (gain) attributable to noncontrolling interest	$ 6,142		$ (1,274)		$ 6,436												$ 11,304			$ 5,162

[1] Goodwill impairment of $29,300, $(5,802), and $27,960 related to the PST segment was recorded for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively, of which $6,436, $(1,274) and $6,142 was attributable to noncontrolling interest.

[2] In addition to the PST goodwill impairment amounts in item (B) herein, a loss on early extinguishment of debt of $920 and $9,687 was recorded for the quarters ended September 30, 2014 and December 31, 2014, respectively.

[3] A loss on disposal of the Wiring business was recorded for $1,138, $6,548 and $890 for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively.

[4]

[5] Earnings per share for the year may not equal the sum of the four historical quarters earnings per share due to changes in weighted-average basic and diluted shares outstanding.