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Commitments and Contingencies (Narrative) (Details) In Thousands, unless otherwise specified |  |  |  |  | 12 Months Ended | 24 Months Ended |  |  | 0 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2013 Accrued Expenses and Other Current Liabilities [Member] USD ($) | Dec. 31, 2012 Accrued Expenses and Other Current Liabilities [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2012 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2013 Letter of Credit [Member] USD ($) | Dec. 31, 2011 PST Eletronicaltda [Member] | Dec. 31, 2013 PST Eletronicaltda [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] BRL | Dec. 31, 2012 PST Eletronicaltda [Member] | Dec. 31, 2010 PST Eletronicaltda [Member] | Dec. 30, 2011 PST Eletronicaltda [Member] | Dec. 31, 2013 PST Eletronicaltda [Member] Value AddedTax [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] Value AddedTax [Member] BRL | Dec. 31, 2013 PST Eletronicaltda [Member] Interest On Tax [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] Interest On Tax [Member] BRL | Dec. 31, 2013 PST Eletronicaltda [Member] Penalties On Tax [Member] USD ($) | Dec. 31, 2013 PST Eletronicaltda [Member] Penalties On Tax [Member] BRL | Dec. 31, 2013 Minda Stoneridge Instruments Ltd [Member] | Dec. 31, 2012 Minda Stoneridge Instruments Ltd [Member] | Dec. 31, 2011 Minda Stoneridge Instruments Ltd [Member]
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability | $ 944 | $ 1,340 | $ 683 | $ 733 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  | 11,469 | 11,469 | 11,925 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  | 49.00% | 49.00% | 49.00%
Loss contingencies aggregate tax assessment not accrued |  |  |  |  |  |  |  |  |  | $ 39,500 | 92,500 |  |  |  | $ 5,600 | 13,200 | $ 4,900 | 11,400 | $ 29,000 | 67,900 |  |  |
Percentage of state value added tax |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  |  |  |  | 74.00% | 74.00% |  |  | 74.00% | 74.00% | 74.00% | 74.00% |  |  |  |  |  |  |  |  |  |  |

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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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