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Accounts Receivable, Net and Revenue Concentrations - Sales Returns (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Allowance for sales returns	$ 0.3	$ 0.4

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration