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v3.19.1

Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Individual assets excluding computer equipment |
Property, Plant and Equipment [Line Items] |
Capitalization threshold, minimum useful life | 1 year
Capitalization threshold, minimum cost | $ 5,000
Assets purchased in bulk |
Property, Plant and Equipment [Line Items] |
Capitalization threshold, minimum cost | $ 5,000
Computer equipment |
Property, Plant and Equipment [Line Items] |
Capitalization threshold, minimum useful life | 1 year
Capitalization threshold, minimum cost | $ 1,000

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- Definition Property, Plant and Equipment, Capitalization Threshold, Minimum Cost + References No definition available. + Details
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Namespace Prefix: | ueic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Property, Plant and Equipment, Capitalization Threshold, Minimum Useful Life + References No definition available. + Details
Name: | ueic_PropertyPlantAndEquipmentCapitalizationThresholdMinimumUsefulLife
Namespace Prefix: | ueic_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ueic_AssetsPurchasedInBulkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |