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

Allowance for Sales Returns, Net Of Unprocessed Returns

No definition available.

Name:	ueic_AllowanceforSalesReturnsNetOfUnprocessedReturns
Namespace Prefix:	ueic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant