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Investments (Details Textual) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Investments (Textual) [Abstract] |  |
Deposits at fair value | $ 3.9 | $ 3.8

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- Definition Deposits at fair value. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | uve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration