Investments (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income (Loss) From Equity Method Investments	$ 96	$ 97	$ 297	$ 236
Noncontrolling Interest, Ownership Percentage by Parent	74.00%		74.00%
Noncontrolling interest	41,209		41,209		44,081
Net loss attributable to noncontrolling interest	634	(1,740)	794	(1,873)
Pst Eletronica Ltda [Member]
Noncontrolling Interest, Ownership Percentage by Parent	74.00%	74.00%	74.00%	74.00%	74.00%
Noncontrolling Interest, Period Increase (Decrease)			2,867
Noncontrolling interest	41,209		41,209
Noncontrolling Interest Increase Due To Change In Foreign Currency Translation			3,455
Net loss attributable to noncontrolling interest			799
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			211
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	3,468	6,453	2,656	4,978
Minda Stoneridge Instruments Ltd [Member]
Income (Loss) From Equity Method Investments	96	97	297	236
Equity Method Investment, Ownership Percentage	49.00%	49.00%	49.00%	49.00%
Equity Method Investments	$ 6,027		$ 6,027		$ 6,215

Increase in noncontrolling interest balance due to change in foreign currency translation.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount after tax of other comprehensive (income) loss attributable to noncontrolling interests.

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