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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jun. 01, 2016 | Mar. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |  |
Minimum annual spend towards covered loss | $ 5,000 | $ 4,100
Amount incurred towards minimum annual spending |  | $ 900
Agreement, terms period |  | June 1, 2016 through May 31, 2025
Agreement, terms expiration date |  | May 31, 2017

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Description of the nature and terms of commitment. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Agreement, terms expiration date, in CCYY-MM-DD format. + References No definition available. + Details
Name: | uve_AgreementTermsExpirationDate
Namespace Prefix: | uve_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Covered loss index swaps, amount incurred towards minimum annual spending. + References No definition available. + Details
Name: | uve_CoveredLossIndexSwapsAmountIncurredTowardsMinimumAnnualSpending
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration