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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 | 9 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
Net sales | $ 166,811 us-gaap_SalesRevenueNet |  | $ 170,338 us-gaap_SalesRevenueNet |  | $ 162,099 us-gaap_SalesRevenueNet |  | $ 161,331 us-gaap_SalesRevenueNet |  | $ 169,235 us-gaap_SalesRevenueNet |  | $ 161,556 us-gaap_SalesRevenueNet |  | $ 169,833 us-gaap_SalesRevenueNet |  | $ 158,862 us-gaap_SalesRevenueNet |  | $ 660,579 us-gaap_SalesRevenueNet | $ 659,486 us-gaap_SalesRevenueNet | $ 612,466 us-gaap_SalesRevenueNet |
Gross profit | 44,901 us-gaap_GrossProfit |  | 49,550 us-gaap_GrossProfit |  | 48,285 us-gaap_GrossProfit |  | 48,138 us-gaap_GrossProfit |  | 50,643 us-gaap_GrossProfit |  | 49,729 us-gaap_GrossProfit |  | 54,303 us-gaap_GrossProfit |  | 51,280 us-gaap_GrossProfit |  |  |  |  |
Operating income | (22,795)us-gaap_OperatingIncomeLoss | [1] | 13,759 us-gaap_OperatingIncomeLoss | [1] | (23,221)us-gaap_OperatingIncomeLoss | [1] | 6,434 us-gaap_OperatingIncomeLoss | [1] | 9,558 us-gaap_OperatingIncomeLoss |  | 12,602 us-gaap_OperatingIncomeLoss |  | 11,752 us-gaap_OperatingIncomeLoss |  | 8,491 us-gaap_OperatingIncomeLoss |  | (25,823)us-gaap_OperatingIncomeLoss | 42,403 us-gaap_OperatingIncomeLoss | 19,905 us-gaap_OperatingIncomeLoss |
Provision (benefit) for income taxes | (1,066)us-gaap_IncomeTaxExpenseBenefit |  | (1,174)us-gaap_IncomeTaxExpenseBenefit |  | 90 us-gaap_IncomeTaxExpenseBenefit |  | 294 us-gaap_IncomeTaxExpenseBenefit |  | 537 us-gaap_IncomeTaxExpenseBenefit |  | 794 us-gaap_IncomeTaxExpenseBenefit |  | 775 us-gaap_IncomeTaxExpenseBenefit |  | 691 us-gaap_IncomeTaxExpenseBenefit |  | (1,856)us-gaap_IncomeTaxExpenseBenefit | 2,797 us-gaap_IncomeTaxExpenseBenefit | (33)us-gaap_IncomeTaxExpenseBenefit |
Income (loss) from continuing operations | (31,306)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 9,138 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | (28,569)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | (467)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 3,489 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 7,459 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 6,413 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 3,168 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | (51,204)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 20,529 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (3,777)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Income (loss) from discontinued operations, net of tax | (1,692)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | [3] | (8,108)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | [3] | (544)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | [3] | 957 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | [3] | (3,168)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | (1,946)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | (22)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | 1,115 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  | (811)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (4,021)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 7,525 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |
Net income (loss) | (32,998)us-gaap_ProfitLoss | [1],[2] | 1,030 us-gaap_ProfitLoss | [1],[2] | (29,113)us-gaap_ProfitLoss | [1],[2] | 490 us-gaap_ProfitLoss | [1],[2] | 321 us-gaap_ProfitLoss |  | 5,513 us-gaap_ProfitLoss |  | 6,391 us-gaap_ProfitLoss |  | 4,283 us-gaap_ProfitLoss |  | (60,591)us-gaap_ProfitLoss | 16,508 us-gaap_ProfitLoss | 3,748 us-gaap_ProfitLoss |
Less: income (loss) attributable to noncontrolling interest | (6,444)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 1,160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (7,221)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | (978)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | [1] | 117 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 466 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 634 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | (13,483)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1,377 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,613)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Net income (loss) attributable to Stoneridge, Inc. | (26,554)us-gaap_NetIncomeLoss | [1],[2],[4] | (130)us-gaap_NetIncomeLoss | [1],[2],[4] | (21,892)us-gaap_NetIncomeLoss | [1],[2],[4] | 1,468 us-gaap_NetIncomeLoss | [1],[2],[4] | 204 us-gaap_NetIncomeLoss |  | 5,047 us-gaap_NetIncomeLoss |  | 5,757 us-gaap_NetIncomeLoss |  | 4,123 us-gaap_NetIncomeLoss |  | (47,108)us-gaap_NetIncomeLoss | 15,131 us-gaap_NetIncomeLoss | 5,361 us-gaap_NetIncomeLoss |
Earnings (loss) per share attributable to continuing operations attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.92)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ (0.79)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.02 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.22 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [5] | $ (1.40)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.72 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Diluted (in dollars per share) | $ (0.92)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ (0.79)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.02 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.21 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [5] | $ (1.40)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.70 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.08)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Earnings (loss) per share attributable to discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.07)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ (0.30)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ 0.03 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ (0.12)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ (0.07)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ 0.00 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ 0.04 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | [5] | $ (0.35)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.15)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ 0.28 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |
Diluted (in dollars per share) | $ (0.07)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ (0.29)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ 0.03 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ (0.11)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ (0.07)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ 0.00 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ 0.04 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | [5] | $ (0.35)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.14)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ 0.28 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |
Earnings (loss) per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.99)us-gaap_EarningsPerShareBasic | [5] | $ 0.00 us-gaap_EarningsPerShareBasic | [5] | $ (0.81)us-gaap_EarningsPerShareBasic | [5] | $ 0.05 us-gaap_EarningsPerShareBasic | [5] | $ 0.01 us-gaap_EarningsPerShareBasic | [5] | $ 0.19 us-gaap_EarningsPerShareBasic | [5] | $ 0.22 us-gaap_EarningsPerShareBasic | [5] | $ 0.15 us-gaap_EarningsPerShareBasic | [5] | $ (1.75)us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic |
Diluted (in dollars per share) | $ (0.99)us-gaap_EarningsPerShareDiluted | [5] | $ 0.00 us-gaap_EarningsPerShareDiluted | [5] | $ (0.81)us-gaap_EarningsPerShareDiluted | [5] | $ 0.05 us-gaap_EarningsPerShareDiluted | [5] | $ 0.01 us-gaap_EarningsPerShareDiluted | [5] | $ 0.19 us-gaap_EarningsPerShareDiluted | [5] | $ 0.21 us-gaap_EarningsPerShareDiluted | [5] | $ 0.15 us-gaap_EarningsPerShareDiluted | [5] | $ (1.75)us-gaap_EarningsPerShareDiluted | $ 0.56 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted |
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,458 us-gaap_GoodwillImpairmentLoss |  |  |
Goodwill impairment loss (gain) attributable to noncontrolling interest | 6,142 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) on early extinguishment of debt | (9,687)us-gaap_GainsLossesOnExtinguishmentOfDebt |  | (920)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,607)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |
Loss on disposal, net of tax | 890 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 6,548 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 1,138 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  |  |  |  |  | (8,576)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |
PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share attributable to Stoneridge, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge (benefit) | 27,960 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | (5,802)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | 29,300 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |  |  | 51,458 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  | 23,498 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember
Goodwill impairment loss (gain) attributable to noncontrolling interest | $ 6,142 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | $ (1,274)sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  | $ 6,436 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  |  |  |  |  |  |  |  |  |  | $ 11,304 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember |  |  | $ 5,162 sri_GoodwillImpairmentLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = sri_PstMember
[1] | Goodwill impairment of $29,300, $(5,802), and $27,960 related to the PST segment was recorded for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively, of which $6,436, $(1,274) and $6,142 was attributable to noncontrolling interest.
[2] | In addition to the PST goodwill impairment amounts in item (B) herein, a loss on early extinguishment of debt of $920 and $9,687 was recorded for the quarters ended September 30, 2014 and December 31, 2014, respectively.
[3] | A loss on disposal of the Wiring business was recorded for $1,138, $6,548 and $890 for the quarters ended June 30, 2014, September 30, 2014 and December 31, 2014, respectively.
[4] |
[5] | 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.

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