Summary of Significant Accounting Policies (Narrative) (Details) € in Thousands, R$ in Thousands, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended				65 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 BRL (R$) shares	May 15, 2017	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)	May 16, 2017
Accounting Policy [Line Items]
Depreciation expense			$ 24,904	$ 22,786	$ 21,490
Less: Net loss attributable to noncontrolling interest					(130)
Preproduction costs related to long-term supply arrangements, costs capitalized			7,666	6,875
Impairment of Goodwill			0	0	0
Intangible assets, net			58,122	62,032
Amortization			5,955	6,406	6,440
Amortization expense next year			5,722
Amortization expense year two			5,722
Amortization expense year three			5,722
Amortization expense year four			5,722
Amortization expense year five			$ 5,722
Intangible assets, weighted-average remaining amortization period, years			11 years
Intangible impairment charge			$ 0	202	0
Design and development expense			$ 52,198	$ 51,074	$ 48,877
Design and development expense percentage			6.30%	5.90%	5.90%	5.90%
Research and development expense reimbursed			$ 15,096	$ 16,540	$ 14,946
Share-based compensation expense			6,191	5,632	7,265
Share-based compensation expense capitalized as inventory			0	0	0
Cumulative goodwill impairment			300,083	300,083
Product warranty and recall accrual			3,111	3,283
Inventory amount, FIFO			82,910	64,745
Inventory amount, weighted average cost			10,539	14,533
Foreign currency transaction gain (loss)			(372)	487	(500)
Amortization of financing costs			624	326	324
Interest expense, net			(4,324)	(4,720)	(5,783)
Deferred financing costs, net			1,625	882
Operating lease right-of-use asset			22,027
Operating lease liability			22,527
Earn-out consideration, operating and financing activities	$ 8,474	$ 8,474
Payment of earn-out consideration paid within operating activities			2,308	213	7,485
Earn-out consideration cash payment within financing activities			3,394
Selling, General and Administrative Expenses [Member]
Accounting Policy [Line Items]
Share-based compensation expense			6,191	5,632	7,265
Prepaid Expenses and Other Current Assets [Member]
Accounting Policy [Line Items]
Preproduction costs related to long-term supply arrangements, costs capitalized			7,544	6,875
Electronics [Member]
Accounting Policy [Line Items]
Intangible impairment charge				202
Interest expense, net			(350)	(85)	(119)
Stoneridge Brazil [Member]
Accounting Policy [Line Items]
Accounts receivable sold			0	0	2,520	R$ 7,983
Gain (loss) on sale of accounts receivable					(86)	273
Proceeds from sale of accounts receivable					2,434	R$ 7,710
Interest expense, net			(208)	(824)	(1,812)
Control Devices [Member]
Accounting Policy [Line Items]
Interest expense, net			$ (811)	$ (76)	$ (103)
Performance Based Right to Receive Common Shares [Member]
Accounting Policy [Line Items]
Common shares, non-vested | shares			566,337	628,220	766,538	766,538
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares			566,337	628,220	766,538	766,538
Customer Lists [Member]
Accounting Policy [Line Items]
Intangible assets, net			$ 33,284	$ 37,651
Customer Lists [Member] | Electronics [Member]
Accounting Policy [Line Items]
Intangible assets, net			23,019
Customer Lists [Member] | Stoneridge Brazil [Member]
Accounting Policy [Line Items]
Intangible assets, net			10,265
Trade Names [Member]
Accounting Policy [Line Items]
Intangible assets, net			13,354	14,805
Trade Names [Member] | Electronics [Member]
Accounting Policy [Line Items]
Intangible assets, net			4,561
Trade Names [Member] | Stoneridge Brazil [Member]
Accounting Policy [Line Items]
Intangible assets, net			8,793
Technology [Member]
Accounting Policy [Line Items]
Intangible assets, net			7,878	$ 9,576
Technology [Member] | Electronics [Member]
Accounting Policy [Line Items]
Intangible assets, net			3,498
Technology [Member] | Stoneridge Brazil [Member]
Accounting Policy [Line Items]
Intangible assets, net			4,270
Technology [Member] | Control Devices [Member]
Accounting Policy [Line Items]
Intangible assets, net			110
Capitalized Software Development [Member]
Accounting Policy [Line Items]
Intangible assets, net			3,606
Capitalized Software Development [Member] | Electronics [Member]
Accounting Policy [Line Items]
Intangible assets, net			2,233
Capitalized Software Development [Member] | Control Devices [Member]
Accounting Policy [Line Items]
Intangible assets, net			$ 1,373
Stoneridge Brazil [Member]
Accounting Policy [Line Items]
Percentage ownership in consolidated subsidiary							74.00%
Percentage of additional noncontrolling interest acquired										26.00%
Less: Net loss attributable to noncontrolling interest					$ 130
MSIL
Accounting Policy [Line Items]
Equity method investment, ownership percentage			49.00%	49.00%	49.00%	49.00%
Equity method investments			$ 12,701	$ 11,288
Maximum [Member] | Pre-production Costs [Member]
Accounting Policy [Line Items]
Property, plant and equipment, useful life			7 years
Maximum [Member] | Capitalized Software Development [Member]
Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives			P7Y
Minimum [Member] | Pre-production Costs [Member]
Accounting Policy [Line Items]
Property, plant and equipment, useful life			3 years
Minimum [Member] | Capitalized Software Development [Member]
Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives			P3Y
Orlaco [Member]
Accounting Policy [Line Items]
Payment of earn-out consideration paid within operating activities			$ 5,080
Earn-out consideration cash payment within financing activities			3,394
Earn-out consideration								$ 7,500	€ 7,500
Credit Facility [Member]
Accounting Policy [Line Items]
Amortization of financing costs			1,366
Interest expense, net			$ (275)