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Debt (Narrative) (Details) ¥ in Thousands, kr in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2021 USD ($) | Mar. 31, 2021 SEK (kr) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2021 SEK (kr) | Mar. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 SEK (kr) | Dec. 31, 2020 CNY (¥) | Jun. 26, 2020 USD ($) | Jun. 05, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ 153,500 |  |  |  |  |  | $ 136,000 |  |  |  |
Subsidiary borrowed |  | 20,500 |  | $ 71,500 |  |  |  |  |  |  |  |
Repayments of credit line |  | 3,000 |  | $ 36,500 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 60,508 |  |  |  |  |  | 73,919 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  | $ 1,366 |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 400,000
Increase in maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 150
Borrowings outstanding |  | 153,500 |  |  |  |  |  | 136,000 |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  | $ 275 |  |  |  |  |  |  |
Debt instrument covenant default of other debt maximum amount |  | 30,000 |  |  |  |  |  |  |  |  |  |
Debt instrument covenant uninsured asset losses maximum amount |  | $ 30,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  | 2.85% |  |  |  | 2.85% | 2.85% |  |  |  |  |
Suzhou Short-Term Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 7,631 |  |  |  |  | ¥ 50,000 | 7,663 |  |  |  |
Borrowings outstanding |  | $ 4,350 |  |  |  |  |  | $ 4,521 |  |  |  |
Outstanding credit lines weighted-average interest rate |  | 4.30% |  |  |  | 4.30% | 4.30% | 4.32% | 4.32% | 4.32% |  |
Suzhou Short-Term Credit Line [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding credit lines interest rate |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |
Suzhou Short-Term Credit Line [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding credit lines interest rate |  | 3.85% | 3.85% |  |  |  |  |  |  |  |  |
Bank Acceptance Draft Credit Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  | $ 2,289 |  |  |  |  | ¥ 15,000 | $ 2,299 |  | ¥ 15,000 |  |
Borrowings outstanding |  | 1,254 |  |  |  |  |  | 414 |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 1,703 |  |  |  |  |  | $ 1,720 |  |  |  |
Stoneridge Brazil Short-Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, weighted average interest rate |  | 7.07% |  |  |  | 7.07% | 7.07% |  |  |  |  |
Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility covenant compliance |  | The Company was in compliance with all credit facility covenants at March 31, 2021 and December 31, 2020 | The Company was in compliance with all credit facility covenants at March 31, 2021 and December 31, 2020 |  |  |  |  |  |  |  |  |
Amendment Number One [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  | $ 1,086 |  |  |  |  |  |  |  |  |  |
Credit facility required minimum liquidity |  |  |  |  |  |  |  |  |  |  | $ 150,000 |
Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarter Ended December 31, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  |  |  | 275.00% | 275.00% | 275.00% |  |
Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarter Ended March 31, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  | 325.00% |  |  |  | 325.00% | 325.00% |  |  |  |  |
Amendment Number One [Member] | Revolving Credit Facility [Member] | Quarters Ended After March 31, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  |  |  |  |  |  | 350.00% |
Amendment Number One [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ 130,000 |
Amendment Number One [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |  |  |
Amendment Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
Stoneridge Brazil [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal repayment in next twelve months |  | 832 |  |  |  |  |  |  |  |  |  |
Specified Hedge Borrowings [Member] | Amendment Number One [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | 50,000 |  |  |  |  |  |  |  |  |  |
Specified Hedge Borrowings [Member] | Amendment Number One [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.00% |  |  |  |  |  |  |  |  |  |  |
Electronics [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 2,291 |  |  |  | kr 20,000 |  | $ 2,435 | kr 20,000 |  |  |
Borrowings outstanding |  |  |  |  |  |  |  | $ 1,591 | kr 13,072 |  |  |
Subsidiary borrowed |  | 10,992 | kr 95,939 |  |  |  |  |  |  |  |  |
Repayments of credit line |  | $ 12,490 | kr 109,011 |  |  |  |  |  |  |  |  |

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