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

X

- 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

X

- Details

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