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Stock-Based Compensation - Stock Options and Restricted Stock Narrative (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 12, 2015
Feb. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from stock options exercised $ 8,122,000us-gaap_ProceedsFromStockOptionsExercised $ 12,371,000us-gaap_ProceedsFromStockOptionsExercised $ 2,204,000us-gaap_ProceedsFromStockOptionsExercised    
Tax benefit from stock options exercised 3,100,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 2,300,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 200,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised    
Options granted (in shares) 133,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 201,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 153,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Restricted stock granted (in shares) 155,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 196,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 205,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod    
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 1 year        
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Modification expense 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Unrecognized pre-tax stock-based compensation expense 2,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Unrecognized pre-tax stock-based compensation expense, period for recognition 1 year 9 months 18 days        
Stock options | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Stock options | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Non-vested restricted stock award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized pre-tax stock-based compensation expense 9,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Unrecognized pre-tax stock-based compensation expense, period for recognition 2 years 3 months 17 days        
Non-vested restricted stock award | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 1 year        
Non-vested restricted stock award | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Subsequent event | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)       73,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
 
Subsequent event | Stock options | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Options grant date fair value       1,800,000ueic_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
 
Subsequent event | Stock options | Certain Executive Employees | Quarterly Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage       8.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
/ us-gaap_VestingAxis
= ueic_QuarterlyVestingMember
 
Subsequent event | Stock options | Certain Executive Employees | Percent Vesting on February 12, 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage         33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
/ us-gaap_VestingAxis
= ueic_PercentVestingonFebruary122015Member
Subsequent event | Non-vested restricted stock award | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Restricted stock granted (in shares)       27,845us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
 
Restricted stock, grant date fair value (in dollars per share)       1,800,000ueic_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
 
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Quarterly Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage       8.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
/ us-gaap_VestingAxis
= ueic_QuarterlyVestingMember
 
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on February 12, 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage         33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= ueic_CertainExecutiveEmployeesMember
/ us-gaap_VestingAxis
= ueic_PercentVestingonFebruary122015Member