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Significant Accounting Policies - Restricted Cash and Cash equivalents (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 2,653	$ 33,009
Restricted cash and cash equivalents, % by Institution	100.00%	100.00%
U .S. Bank IT&C [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	800	800
Restricted cash and cash equivalents, % by Institution	30.20%	2.40%
Bank of New York Mellon Trust Co. [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	53
Restricted cash and cash equivalents, % by Institution	2.00%
Florida Department of Financial Services [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	1,800	32,209
Restricted cash and cash equivalents, % by Institution	67.80%	97.60%
Funds Held in Trust [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	53
Funds Held in Trust [Member] | Bank of New York Mellon Trust Co. [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	53
State Deposits [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	2,600	33,009
State Deposits [Member] | U .S. Bank IT&C [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	800	800
State Deposits [Member] | Florida Department of Financial Services [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 1,800	$ 32,209

X

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restricted cash and cash equivalents, percentage by institution.

+ References

No definition available.

+ Details

Name:	uve_RestrictedCashAndCashEquivalentsPercentageByInstitution
Namespace Prefix:	uve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant