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Unaudited Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net sales $ 222,725 $ 219,256 $ 234,265 $ 262,267 $ 186,048 $ 195,864 $ 190,417 $ 193,044 $ 938,513 $ 765,373 $ 635,226
Gross profit 54,609 51,238 53,659 65,138 32,318 37,451 37,718 39,290      
Operating income 8,648 6,615 1,617 11,849 (7,584) 6,997 7,413 6,700 28,729 13,526 23,524
Provision (benefit) for income taxes 95 383 (884) 1,218 22,727 1,543 1,158 677 812 26,105 678
Net income (loss) 2,711 589 (5,298) 5,746 35,366 [1] 4,257 [1] 3,240 [1] 2,674 [1] 3,748 45,537 11,346
Net income (loss) attributable to noncontrolling interests 90 170 (1,740) (133) (3,209) (272) (124) (215) (1,613) (3,820) (184)
Net income (loss) attributable to Stoneridge, Inc. $ 2,621 $ 419 $ (3,558) $ 5,879 $ 38,575 $ 4,529 $ 3,364 $ 2,889 $ 5,361 $ 49,357 $ 11,530
Earnings per share attributable to Stoneridge, Inc.:                      
Basic (in dollars per share) $ 0.10 [2] $ 0.02 [2] $ (0.13) [2] $ 0.22 [2] $ 1.58 [2] $ 0.19 [2] $ 0.14 [2] $ 0.12 [2]      
Diluted (in dollars per share) $ 0.10 [2] $ 0.02 [2] $ (0.13) [2] $ 0.22 [2] $ 1.56 [2] $ 0.18 [2] $ 0.14 [2] $ 0.12 [2]      
[1] As a result of obtaining a controlling interest in PST on December 31, 2011, the Company recognized a one-time non-cash after-tax gain of $42.5 million.
[2] 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.