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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 18,545 | $ 46,364
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 18,545 | $ 46,364

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date. + References No definition available. + Details
Name: | uve_ReinsuranceUnsecuredAmountsDueFromReinsurers
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_CededCreditRiskAxis=uve_FloridaHurricaneCatastropheFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |