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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Organization, Consolidation and Presentation Of Financial Statements [Abstract] |
Schedule Of Accounts Receivable and Concentration Of Credit Risk [Table Text Block] | The Company’s largest customers were Navistar International Corporation (“Navistar”) and Deere & Company (“Deere”), primarily related to the Wiring reportable segment, and accounted for the following percentages of consolidated net sales for the years ended December 31, 2012, 2011 and 2010:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Navistar |  |  | 18 | % |  |  | 24 | % |  |  | 24 | %
Deere |  |  | 13 | % |  |  | 15 | % |  |  | 14 | %
Schedule of Inventory, Current [Table Text Block] | Inventories consist of the following:
As of December 31 |  | 2012 |  |  | 2011 |
Raw materials |  | $ | 64,340 |  |  | $ | 72,145 |
Work-in-progress |  |  | 13,621 |  |  |  | 14,722 |
Finished goods |  |  | 18,071 |  |  |  | 33,615 |
Total inventories, net |  | $ | 96,032 |  |  | $ | 120,482 |
Property Plant and Equipment Net Disclosure [Table Text Block] | Property, plant and equipment are recorded at cost and consist of the following:
As of December 31 |  | 2012 |  |  | 2011 |
Land and land improvements |  | $ | 5,117 |  |  | $ | 5,254 |
Buildings and improvements |  |  | 45,940 |  |  |  | 45,291 |
Machinery and equipment |  |  | 196,003 |  |  |  | 177,434 |
Office furniture and fixtures |  |  | 8,856 |  |  |  | 8,789 |
Tooling |  |  | 71,045 |  |  |  | 69,719 |
Information technology |  |  | 33,009 |  |  |  | 31,158 |
Vehicles |  |  | 1,456 |  |  |  | 1,459 |
Leasehold improvements |  |  | 3,560 |  |  |  | 3,416 |
Construction in progress |  |  | 17,656 |  |  |  | 19,089 |
Total property, plant, and equipment |  |  | 382,642 |  |  |  | 361,609 |
Less: accumulated depreciation |  |  | (263,495 | ) |  |  | (236,665 | )
Property, plant and equipment, net |  | $ | 119,147 |  |  | $ | 124,944 |
Property, Plant and Equipment [Table Text Block] | Depreciable lives within each property classification are as follows:
Buildings and improvements | 10–40 years
Machinery and equipment | 3–10 years
Office furniture and fixtures | 3–10 years
Tooling | 2–5 years
Information technology | 3–5 years
Vehicles | 3–5 years
Leasehold improvements | shorter of lease term or 3–10 years
Schedule Of Business Combination Consideration Transferred [Table Text Block] | The acquisition date fair value of the total consideration transferred consisted of the following:
Cash |  | $ | 29,669 |
Common Shares (1,940,413 shares) |  |  | 15,310 |
Fair value of consideration transferred |  |  | 44,979 |
Fair value of the Company's previously held equity interest |  |  | 104,118 |
Fair value of noncontrolling interest |  |  | 48,727 |
Total fair value of PST |  | $ | 197,824 |
Schedule of Purchase Price Allocation [Table Text Block] | The following table summarizes the allocation of the consideration transferred to the assets acquired and liabilities assumed at the acquisition date. At December 31, 2011 (controlling interest acquisition date)
|  | Initial |  |  | Final |
|  | Allocation |  |  | Allocation |
Cash |  | $ | 2,137 |  |  | $ | 2,137 |
Accounts receivable |  |  | 48,993 |  |  |  | 48,993 |
Inventory |  |  | 56,204 |  |  |  | 56,041 |
Prepaids and other current assets |  |  | 9,547 |  |  |  | 9,051 |
Property, plant and equipment |  |  | 42,389 |  |  |  | 42,531 |
Identifiable intangible assets |  |  | 102,090 |  |  |  | 97,398 |
Other long-term assets |  |  | 1,479 |  |  |  | 1,479 |
Total identifiable assets acquired |  |  | 262,839 |  |  |  | 257,630 |
Accounts payable |  |  | 9,825 |  |  |  | 9,475 |
Other current liabilities |  |  | 25,801 |  |  |  | 25,378 |
Debt |  |  | 54,068 |  |  |  | 54,068 |
Deferred tax liabilities |  |  | 39,392 |  |  |  | 38,003 |
Total liabilities assumed |  |  | 129,086 |  |  |  | 126,924 |
Net identifiable assets acquired |  |  | 133,753 |  |  |  | 130,706 |
Goodwill |  |  | 64,071 |  |  |  | 67,118 |
Net assets acquired |  | $ | 197,824 |  |  | $ | 197,824
Business Acquisition, Pro Forma Information [Table Text Block] | The unaudited pro forma information is not necessarily indicative of the results of operations that the Company would have reported had the transaction actually occurred at the beginning of these periods, nor is it necessarily indicative of future results.
Years ended December 31 |  | 2011 |  |  | 2010 |
Net sales |  | $ | 999,553 |  |  | $ | 818,172 |
Net income attributable to Stoneridge, Inc. and subsidiaries |  | $ | 10,608 |  |  | $ | 55,730 |
Schedule of Goodwill [Table Text Block] | Goodwill as of December 31, 2012 and 2011, and changes in the carrying amount of goodwill by segment were as follows:
|  |  |  |  |  |  |  | Control |  |  |  |  |  |  |
|  | Electronics |  |  | Wiring |  |  | Devices |  |  | PST |  |  | Total |
Balance at January 1, 2011 |  | $ | 578 |  |  | $ | 9,118 |  |  | $ | - |  |  | $ | - |  |  | $ | 9,696 |
Acquistion of business |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 67,118 |  |  |  | 67,118 |
Impairment |  |  | - |  |  |  | (4,945 | ) |  |  | - |  |  |  | - |  |  |  | (4,945 | )
Translations and other adjustments |  |  | (14 | ) |  |  | - |  |  |  | - |  |  |  |  |  |  |  | (14 | )
Balance at December 31, 2011 |  |  | 564 |  |  |  | 4,173 |  |  |  | - |  |  |  | 67,118 |  |  |  | 71,855 |
Translations and other adjustments |  |  | 34 |  |  |  | - |  |  |  | - |  |  |  | (5,508 | ) |  |  | (5,474 | )
Balance at December 31, 2012 |  | $ | 598 |  |  | $ | 4,173 |  |  | $ | - |  |  | $ | 61,610 |  |  | $ | 66,381 |
Schedule Of Goodwill Impairment [Table Text Block] | The table below shows accumulated goodwill impairment for the year ended December 31, 2012 and 2011:
Accumulated goodwill impairment loss at January 1, 2011 |  | $ | 248,625 |
Goodwill impairment charge |  |  | 4,945 |
Accumulated goodwill impairment loss at December 31, 2011 |  |  | 253,570 |
Goodwill impairment charge |  |  | - |
Accumulated goodwill impairment loss at December 31, 2012 |  | $ | 253,570 |
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] | Intangible assets, net at December 31, 2012 consisted of the following:
|  | Acquisition |  |  | Accumulated |  |  |  |
As of December 31, 2012 |  | cost |  |  | amortization |  |  | Net |
Customer lists |  | $ | 43,973 |  |  | $ | (3,166 | ) |  | $ | 40,807 |
Trademarks |  |  | 29,252 |  |  |  | (1,870 | ) |  |  | 27,382 |
Technology |  |  | 17,323 |  |  |  | (1,115 | ) |  |  | 16,208 |
Other |  |  | 66 |  |  |  | (66 | ) |  |  | - |
Total |  | $ | 90,614 |  |  | $ | (6,217 | ) |  | $ | 84,397 |
Intangible assets, net at December 31, 2011 consisted of the following:
|  | Acquisition |  |  | Accumulated |  |  |  |
As of December 31, 2011 |  | cost |  |  | amortization |  |  | Net |
Customer lists |  | $ | 47,840 |  |  | $ | (194 | ) |  | $ | 47,646 |
Trademarks |  |  | 31,829 |  |  |  | (316 | ) |  |  | 31,513 |
Technology |  |  | 18,872 |  |  |  | - |  |  |  | 18,872 |
Other |  |  | 87 |  |  |  | (79 | ) |  |  | 8 |
Total |  | $ | 98,628 |  |  | $ | (589 | ) |  | $ | 98,039
Accrued Expenses and Other Current Liabilities [Table Text Block] | Accrued expenses and other current liabilities consist of the following:
As of December 31 |  | 2012 |  |  | 2011 |
Compensation related reserves |  | $ | 22,620 |  |  | $ | 22,013 |
Product warranty and recall obligations |  |  | 5,613 |  |  |  | 5,126 |
Financial instruments |  |  | 191 |  |  |  | 7,722 |
Liability to PST shareholders |  |  | - |  |  |  | 29,976 |
Other (A) |  |  | 28,657 |  |  |  | 26,157 |
Total accrued expenses and other current liabilities |  | $ | 57,081 |  |  | $ | 90,994 |
| (A) | “Other” is comprised of miscellaneous accruals; none of which contributed a significant portion of the total.
Schedule of Product Warranty Liability [Table Text Block] | The following provides a reconciliation of changes in the product warranty and recall reserve:
Years ended December 31 |  | 2012 |  |  | 2011 |
Product warranty and recall at beginning of period |  | $ | 5,301 |  |  | $ | 3,831 |
Accruals for products shipped during period |  |  | 3,288 |  |  |  | 3,142 |
Acquisition |  |  | - |  |  |  | 1,063 |
Aggregate changes in pre-existing liabilities due to claim developments |  |  | 1,062 |  |  |  | (168 | )
Settlements made during the period (in cash or in kind) |  |  | (3,544 | ) |  |  | (2,567 | )
Product warranty and recall at end of period |  | $ | 6,107 |  |  | $ | 5,301
Schedule of Weighted Average Number of Shares [Table Text Block] | Actual weighted-average Common Shares outstanding used in calculating basic and diluted net income per share were as follows:
Years ended December 31 |  | 2012 |  |  | 2011 |  |  | 2010 |
Basic weighted-average shares outstanding |  |  | 26,377,352 |  |  |  | 24,180,671 |  |  |  | 23,945,754 |
Effect of dilutive shares |  |  | 654,518 |  |  |  | 464,258 |  |  |  | 386,847 |
Diluted weighted-average shares outstanding |  |  | 27,031,870 |  |  |  | 24,644,929 |  |  |  | 24,332,601

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