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Inventories and Significant Suppliers - Related Party Supplier (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Executive Vice President |
Related Party Transactions [Line Items] |
Ownership percentage in third party by executive | 40.00%
Inventory Purchases | Supplier Concentration Risk | Affiliated Entity |
Related Party Transactions [Line Items] |
Inventory purchases form related party supplier | $ 1.1

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- Definition Related party transaction, ownership percentage by affiliated entity + References No definition available. + Details
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Namespace Prefix: | ueic_
Data Type: | num:percentItemType
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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |