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Accounts Receivable, Net and Revenue Concentrations - Sales Returns (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Receivables [Abstract] |  |
Allowance for sales return | $ 0.4 | $ 0.4

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- Definition Allowance for Sales Returns, Net Of Unprocessed Returns + References No definition available. + Details
Name: | ueic_AllowanceforSalesReturnsNetOfUnprocessedReturns
Namespace Prefix: | ueic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration