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Significant Accounting Policies - Restricted Cash and Cash equivalents (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents | $ 2,600 | $ 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, % by Institution | 30.80% | 2.40%
Florida Department of Financial Services [Member] |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash and cash equivalents, % by Institution | 69.20% | 97.60%
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

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- 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

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

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- 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