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Fair Value Measurements (Details Textual) (Equity Securities [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2012
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Equity Securities [Member] |
Fair Value Measurements (Textual) [Abstract] |
Fair value of transferred equity securities | $ 38

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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