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Unaudited Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Abstract]                      
Net sales $ 207,440 $ 203,582 $ 209,111 $ 204,311 $ 172,612 $ 173,846 $ 186,903 $ 162,616 $ 824,444 $ 695,977 $ 644,812
Gross profit 61,026 62,549 63,414 61,151 47,779 49,748 52,751 45,161      
Operating income (loss) 13,234 13,296 15,676 15,164 10,170 11,780 13,626 8,506 57,370 44,082 27,815
Provision (benefit) for income taxes (6,036) [1] 3,809 [1] 5,189 [1] 4,571 [1] (39,503) [2] 919 [2] 1,350 [2] 845 [2] 7,533 (36,389) (547)
Income (loss) from continuing operations                 45,049 75,574 20,777
Income (loss) from discontinued operations                     (210)
Net income (loss) 18,908 8,049 8,919 9,173 48,489 9,981 10,995 6,109 45,049 75,574 20,567
Less: income (loss) attributable to noncontrolling interest     (100) (30) 122 (303) (576) (1,130) (130) (1,887) (2,207)
Net income (loss) attributable to Stoneridge, Inc. $ 18,908 $ 8,049 $ 9,019 $ 9,203 $ 48,367 $ 10,284 $ 11,571 $ 7,239 $ 45,179 $ 77,461 $ 22,774
Earnings (loss) per share attributable to continuing operations attributable to Stoneridge, Inc.:                      
Basic (in dollars per share)                 $ 1.61 $ 2.79 $ 0.84
Diluted (in dollars per share)                 1.57 2.74 0.82
Earnings (loss) per share attributable to discontinued operations:                      
Basic (in dollars per share)                 0.00 0.00 (0.01)
Diluted (in dollars per share)                 0.00 0.00 (0.01)
Earnings (loss) per share attributable to Stoneridge, Inc.:                      
Basic (in dollars per share) $ 0.67 [3] $ 0.29 [3] $ 0.32 [3] $ 0.33 [3] $ 1.74 [3] $ 0.37 [3] $ 0.42 [3] $ 0.26 [3] 1.61 2.79 0.83
Diluted (in dollars per share) $ 0.65 [3] $ 0.28 [3] $ 0.32 [3] $ 0.32 [3] $ 1.70 [3] $ 0.36 [3] $ 0.41 [3] $ 0.26 [3] $ 1.57 $ 2.74 $ 0.81
[1] The impact of the Tax Legislation was an increase in tax expense of $6.2 million due to the one-time deemed repatriation tax, offset by the favorable impacts of the reduced tax rate on the Company's net deferred tax liabilities and other deferred tax adjustments of $(15.3) million related to certain earnings included in the one-time transition tax.
[2] The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets for the year ended December 31, 2016.
[3] 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.