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Stockholders' Equity - Summary of Unaudited Pro-Forma Adjustments to Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Balance Sheet Statements Captions [Line Items]        
Total assets $ 911,774us-gaap_Assets $ 920,090us-gaap_Assets    
Total liabilities 692,858us-gaap_Liabilities 744,481us-gaap_Liabilities    
Contingently redeemable common stock 19,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent      
STOCKHOLDERS' EQUITY:        
Cumulative convertible preferred stock, $.01 par value          
Common stock, $.01 par value 448us-gaap_CommonStockValue 436us-gaap_CommonStockValue    
Treasury shares, at cost - 9,667 and 8,275 (62,153)us-gaap_TreasuryStockValue (35,467)us-gaap_TreasuryStockValue    
Additional paid-in capital 40,987us-gaap_AdditionalPaidInCapital 42,282us-gaap_AdditionalPaidInCapital    
Accumulated other comprehensive income (loss), net of taxes (1,835)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (376)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Retained earnings 222,469us-gaap_RetainedEarningsAccumulatedDeficit 168,734us-gaap_RetainedEarningsAccumulatedDeficit    
Total stockholders' equity (See Notes 8 and 18) 199,916us-gaap_StockholdersEquity [1] 175,609us-gaap_StockholdersEquity 163,514us-gaap_StockholdersEquity 150,005us-gaap_StockholdersEquity
Total liabilities, contingently redeemable common stock and stockholders' equity 911,774us-gaap_LiabilitiesAndStockholdersEquity 920,090us-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 (See Notes 8 and 18) 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 8,275 (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 (See Notes 8 and 18) 218,916us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		 [1]      
Total liabilities, contingently redeemable common stock and stockholders' equity $ 911,774us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		      
[1] See Note 8 - Stockholders’ Equity for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.