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Inventories, Net and Significant Suppliers - Related Party Vendor (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Executive Vice President [Member]      
Related Party Transaction [Line Items]      
Ownership Percentage in Third Party by Executive 40.00%ueic_RelatedPartyTransactionOwnershipPercentageInAffiliatedEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveVicePresidentMember		    
Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Concentration Risk 3.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 3.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		  
Related Parties, Accounts Payable 2,131us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 $ 2,378us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		  
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Purchases 2,094us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		   $ 1,723us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Concentration Risk 2.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		   2.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember