Subsequent Events (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Feb. 08, 2013
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract	$ 2.7
Declared dividend		$ 0.08
Dividend payment date	Apr. 05, 2013
Dividend record date	Mar. 14, 2013
Option One [Member]
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract	75.0
Option One [Member] \| Minimum [Member]
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract	75.0
Description of terms under T25 replacement contract percentage	45.00%
Option Two [Member]
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract	105.0
Option Two [Member] \| Minimum [Member]
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract	$ 45.0
Option Two [Member] \| Maximum [Member]
Subsequent Events (Textual) [Abstract]
Description of terms under T25 replacement contract percentage	55.00%

Date the declared dividend will be paid, in CCYY-MM-DD format.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of terms under T25 replacement contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Description of terms under T25 replacement contract percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	uve_
Data Type:	num:percentItemType
Balance Type:	na
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- Details

Name:	uve_SubsequentEventsTextualAbstract
Namespace Prefix:	uve_
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Period Type:	duration