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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
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Net sales $ 235,824 $ 233,511 $ 242,785 $ 235,710 $ 222,725 $ 219,256 $ 234,265 $ 262,267 $ 947,830 $ 938,513 $ 765,373
Gross profit 53,553 53,519 60,220 58,729 54,609 51,238 53,659 65,138      
Operating income 6,882 10,705 11,825 10,292 8,648 6,615 1,617 11,849 39,704 28,729 13,526
Provision (benefit) for income taxes 1,066 1,016 1,125 1,019 95 383 (884) 1,218 4,226 812 26,105
Net income (loss) 321 5,513 6,391 4,283 2,711 589 (5,298) 5,746 16,508 3,748 45,537
Net income (loss) attributable to noncontrolling interests 117 466 634 160 90 170 (1,740) (133) 1,377 (1,613) (3,820)
Net income (loss) attributable to Stoneridge, Inc. $ 204 $ 5,047 $ 5,757 $ 4,123 $ 2,621 $ 419 $ (3,558) $ 5,879 $ 15,131 $ 5,361 $ 49,357
Earnings per share attributable to Stoneridge, Inc.:                      
Basic (in dollars per share) $ 0.01 [1] $ 0.19 [1] $ 0.22 [1] $ 0.15 [1] $ 0.10 [1] $ 0.02 [1] $ (0.13) [1] $ 0.22 [1]      
Diluted (in dollars per share) $ 0.01 [1] $ 0.19 [1] $ 0.21 [1] $ 0.15 [1] $ 0.10 [1] $ 0.02 [1] $ (0.13) [1] $ 0.22 [1]      
[1] 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.