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Stockholders' Equity - Summary of Unaudited Pro-Forma Adjustments to Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements Captions [Line Items]    
Total assets $ 967,157us-gaap_Assets $ 911,774us-gaap_Assets
Total liabilities 725,236us-gaap_Liabilities 692,858us-gaap_Liabilities
Contingently redeemable common stock   19,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
STOCKHOLDERS' EQUITY:    
Cumulative convertible preferred stock, $.01 par value      
Common stock, $.01 par value 452us-gaap_CommonStockValue 448us-gaap_CommonStockValue
Treasury shares, at cost - 9,667 and 9,667 (62,153)us-gaap_TreasuryStockValue (62,153)us-gaap_TreasuryStockValue
Additional paid-in capital 63,700us-gaap_AdditionalPaidInCapital 40,987us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss), net of taxes (638)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,835)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 240,560us-gaap_RetainedEarningsAccumulatedDeficit 222,469us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 241,921us-gaap_StockholdersEquity 199,916us-gaap_StockholdersEquity
Total liabilities, contingently redeemable common stock and stockholders' equity 967,157us-gaap_LiabilitiesAndStockholdersEquity 911,774us-gaap_LiabilitiesAndStockholdersEquity
Pro-Forma Adjustment [Member]    
Condensed Balance Sheet Statements Captions [Line Items]    
Contingently redeemable common stock   (19,000)us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementScenarioAxis
= uve_ProFormaAdjustmentMember
STOCKHOLDERS' EQUITY:    
Cumulative convertible preferred stock, $.01 par value     
Additional paid-in capital   19,000us-gaap_AdditionalPaidInCapital
/ us-gaap_StatementScenarioAxis
= uve_ProFormaAdjustmentMember
Total stockholders' equity   19,000us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= uve_ProFormaAdjustmentMember
Pro-Forma [Member]    
Condensed Balance Sheet Statements Captions [Line Items]    
Total assets   911,774us-gaap_Assets
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Total liabilities   692,858us-gaap_Liabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
STOCKHOLDERS' EQUITY:    
Cumulative convertible preferred stock, $.01 par value     
Common stock, $.01 par value   448us-gaap_CommonStockValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Treasury shares, at cost - 9,667 and 9,667   (62,153)us-gaap_TreasuryStockValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Additional paid-in capital   59,987us-gaap_AdditionalPaidInCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Accumulated other comprehensive income (loss), net of taxes   (1,835)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Retained earnings   222,469us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Total stockholders' equity   218,916us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
Total liabilities, contingently redeemable common stock and stockholders' equity   $ 911,774us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember