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Subsequent Events (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Subsequent Event, Date   Apr. 01, 2019  
Subsequent Event, Description   the Company entered into an Asset Purchase Agreement (the "APA") by and among the Company, the Company's wholly owned subsidiary, Stoneridge Control Devices, Inc. ("SCD"), and Standard Motor Products, Inc. ("SMP"). On the same day pursuant to the APA, in exchange for $40.0 million (subject to a post-closing inventory adjustment) and the assumption of certain liabilities, the Company and SCD sold to SMP product lines and assets related to certain non-core switches and connectors (the "Non-Core Switch and Connector Products"). On April 1, 2019, the Company and SMP also entered into certain ancillary agreements, including a transition services agreement, a contract manufacturing agreement and a supply agreement, pursuant to which the Company will provide and be compensated for certain manufacturing, transitional, administrative and support services to SMP on a short-term basis. The products related to the Non-Core Switch and Connector Products are currently manufactured in Juarez, Mexico and Canton, Massachusetts, and include ball switches, ignition switches, rotary switches, courtesy lamps, toggle switches, headlamp switches and other related components  
Non-core Switches and Connector Product [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Disposal group, net sales   $ 11,230 $ 11,961
Disposal group, operating income   $ 3,112 $ 3,701
Subsequent Event [Member] | Scenario, Forecast [Member]      
Proceeds from sale of productive assets $ 40,000