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Income Taxes - Reconciles Statutory Federal Income Tax Rate to Company' s Effective Tax Rate (Parenthetical) (Detail) (State of Florida Income Tax Authority [Member]) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
State of Florida Income Tax Authority [Member] |  |  |
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
State of Florida income tax at a statutory tax rate | 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = uve_StateOfFloridaIncomeTaxAuthorityMember | 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = uve_StateOfFloridaIncomeTaxAuthorityMember | 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = uve_StateOfFloridaIncomeTaxAuthorityMember

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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Period Type: | duration

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- Details
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