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Performance-Based Common Stock Warrants Performance-Based Common Stock Warrants - (Details) - Common stock purchase warrant - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Class of Warrant or Right [Line Items] |  |  |  |
Reduction/(increase) to net sales | $ (141) | $ 1,160 | $ 1,122 | $ 3,219
Income tax (benefit)/expense | $ 53 | $ (426) | $ (418) | $ (1,182)

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- Definition Class of Warrant or Right, Contra Revenue + References No definition available. + Details
Name: | ueic_ClassofWarrantorRightContraRevenue
Namespace Prefix: | ueic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Class of Warrant or Right, Income Tax Expense (Benefit) + References No definition available. + Details
Name: | ueic_ClassofWarrantorRightIncomeTaxExpenseBenefit
Namespace Prefix: | ueic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=ueic_CommonStockPurchaseWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |