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Commitments and Contingencies (Narrative) (Details) BRL in Thousands, $ in Thousands |  | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 15, 2017 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 BRL | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2017 BRL | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product warranty and recall accrual |  |  |  |  |  |  |  |  |  | $ 3,112 | $ 2,617
Gain on Business Interruption Insurance Recovery |  | $ (189) |  |  |  |  |  |  |  |  |
Cash proceeds within cash flows from operating activities |  | 500 |  |  |  |  |  |  |  |  |
Cash proceeds within cash flows from investing activities |  | 711 |  |  |  |  |  |  |  |  |
Estimated Insurance Recoveries |  |  |  |  |  |  |  |  |  | 1,644 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on Business Interruption Insurance Recovery |  | (1,923) |  |  |  |  |  |  |  |  |
Control Devices [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability |  |  |  |  |  |  |  |  |  | 265 | 446
Accrued Expenses and Other Current Liabilities [Member] | Control Devices [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Environmental remediation accrued undiscounted liability |  |  |  |  |  |  |  |  |  | 253 | 370
Letter of Credit [Member] | Control Devices [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  | 2,000 |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 50.00% |  |  |
Loss contingencies aggregate tax assessment not accrued |  |  | BRL 99,300 |  |  |  |  |  | BRL 99,300 | 30,000 | 30,000
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% |  |  |  |
PST Eletronica Ltda [Member] | Civil, Labor and Other Tax Contingencies [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  | BRL 31,800 |  |  |  |  |  | 33,800 | 10,200 | 9,800
PST Eletronica Ltda [Member] | Value Added Tax [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingencies aggregate tax assessment not accrued |  |  |  |  |  |  |  |  | 13,200 | 4,000 | 4,000
PST Eletronica Ltda [Member] | Interest On Tax [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingencies aggregate tax assessment not accrued |  |  |  |  |  |  |  |  | 74,700 | 22,600 | 22,600
PST Eletronica Ltda [Member] | Penalties On Tax [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingencies aggregate tax assessment not accrued |  |  |  |  |  |  |  |  | BRL 11,400 | $ 3,400 | $ 3,400
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% | 49.00% |  |  |  |  | 49.00% | 49.00% | 49.00%
Royal v Stoneridge Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation liability |  |  |  |  |  |  |  |  |  | $ 525 |
Royal v Stoneridge Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum damages sought per plaintiff |  | 5 |  |  |  |  |  |  |  |  |
Litigation Settlement, Maximum Awarded to All Plainfiffs |  |  |  |  |  |  |  |  |  | 15 |
Royal v Stoneridge Inc, Attorney's Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  | $ 375 |
Verde v Stoneridge Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  | $ 3 |  |  |  |  |  |  |  |  |

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