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Investments - Schedule of Real Estate Investment (Parenthetical) (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Real Estate Investments [Abstract] |
Amount tranferred from properties under development to investment real estate | $ 7.4

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- 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 Amount transferred from properties under development to investment real estate. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
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