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Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Net [Abstract]      
Gross $ 42,643,000us-gaap_FiniteLivedIntangibleAssetsGross $ 42,338,000us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated Amortization (18,029,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (15,375,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Intangible assets, net 24,614,000us-gaap_FiniteLivedIntangibleAssetsNet 26,963,000us-gaap_FiniteLivedIntangibleAssetsNet  
Finite-lived intangible assets, fully amortized, gross 7,900,000ueic_FiniteLivedIntangibleAssetsFullyAmortizedGross 6,600,000ueic_FiniteLivedIntangibleAssetsFullyAmortizedGross  
Amortization expense 4,162,000us-gaap_AmortizationOfIntangibleAssets 4,127,000us-gaap_AmortizationOfIntangibleAssets 4,174,000us-gaap_AmortizationOfIntangibleAssets
Minimum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 1 year    
Maximum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 15 years    
Cost of sales      
Finite-Lived Intangible Assets, Net [Abstract]      
Amortization expense 153,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 213,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 312,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Selling, general and administrative      
Finite-Lived Intangible Assets, Net [Abstract]      
Amortization expense 4,009,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 3,914,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 3,862,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Distribution rights      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 347,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1] 395,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1]  
Accumulated Amortization (76,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1] (52,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1]  
Intangible assets, net 271,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1] 343,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DistributionRightsMember		 [1]  
Intangible asset, estimated period of benefit 10 years    
Patents      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 10,107,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1] 8,879,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1]  
Accumulated Amortization (4,736,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1] (4,251,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1]  
Intangible assets, net 5,371,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1] 4,628,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember		 [1]  
Intangible asset, estimated period of benefit 10 years    
Trademark and trade names      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 2,001,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1] 2,841,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1]  
Accumulated Amortization (834,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1] (1,411,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1]  
Intangible assets, net 1,167,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1] 1,430,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 [1]  
Intangible asset, estimated period of benefit 10 years    
Developed and core technology      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 3,506,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1] 3,506,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1]  
Accumulated Amortization (1,373,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1] (1,140,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1]  
Intangible assets, net 2,133,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1] 2,366,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 [1]  
Developed and core technology | Minimum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 5 years    
Developed and core technology | Maximum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 15 years    
Capitalized software development costs      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 276,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1] 311,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1]  
Accumulated Amortization (85,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1] (133,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1]  
Intangible assets, net 191,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1] 178,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 [1]  
Intangible asset, estimated period of benefit 2 years    
Customer relationships      
Finite-Lived Intangible Assets, Net [Abstract]      
Gross 26,406,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1] 26,406,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1]  
Accumulated Amortization (10,925,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1] (8,388,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1]  
Intangible assets, net $ 15,481,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1] $ 18,018,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1]  
Customer relationships | Minimum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 10 years    
Customer relationships | Maximum [Member]      
Finite-Lived Intangible Assets, Net [Abstract]      
Intangible asset, estimated period of benefit 15 years    
[1] This table excludes the gross value of fully amortized intangible assets totaling $7.9 million and $6.6 million on December 31, 2014 and 2013, respectively.