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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 29, 2013
Jun. 30, 2008
Dec. 31, 2007
Nov. 09, 2006
May 23, 2013
Debt Instrument [Line Items]                
Statutory capital and surplus $ 200,200,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance              
Principal repayments of Surplus Note 1,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal 1,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal 1,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal          
Surplus during the term of surplus note 50,000,000uve_MinimumSurplusAmountUnderAmendedAgreement              
Amortization of discount 840,000us-gaap_AmortizationOfDebtDiscountPremium 601,000us-gaap_AmortizationOfDebtDiscountPremium            
Interest Expense 1,500,000us-gaap_InterestExpense 1,200,000us-gaap_InterestExpense 414,000us-gaap_InterestExpense          
Revolving Line of Credit [Member] | Deutsche Bank [Member]                
Debt Instrument [Line Items]                
Unsecured line of credit, maximum borrowing capacity       10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= uve_DeutscheBankMember		        
DB loan, maturity date       Mar. 27, 2015        
DB loan, Interest rate LIBOR plus a margin of 5.50% or Deutsche Bank’s prime rate plus a margin of 3.50%              
Basis spread on LIBOR rate       5.50%uve_LineOfCreditFacilityLiborBasisSpreadOnVariableRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= uve_DeutscheBankMember		        
Basis spread on Prime rate       3.50%uve_LineOfCreditFacilityPrimeBasisSpreadOnVariableRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= uve_DeutscheBankMember		        
Unsecured line of credit, amount drawn 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= uve_DeutscheBankMember		              
Surplus Note [Member]                
Debt Instrument [Line Items]                
Long-term debt surplus 17,300,000us-gaap_LongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		 18,800,000us-gaap_LongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		            
Unsecured term loan agreement             25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		  
Surplus note maturity date Dec. 31, 2026              
Effective interest rate 2.73%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		 2.21%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		 1.96%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		          
Principal repayments of Surplus Note 368,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		              
Maturity year of debt instrument through 2026              
Interest rate increased basis point           4.50%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		    
Decrease in additional interest rate         4.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		      
Basis point from decrease in additional interest rate         0.25%uve_DebtInstrumentDecreasedBasisSpreadOnVariableRate
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		      
Drops below a net written premium to surplus ratio 100.00%uve_WrittenPremiumRatioToSurplusNet
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		              
Gross written premium to surplus ratio 300.00%uve_WrittenPremiumRatioToSurplusGross
/ us-gaap_LongtermDebtTypeAxis
= uve_SurplusNoteMember		              
Surplus Note [Member] | Hurricane [Member]                
Debt Instrument [Line Items]                
Surplus and Reinsurance sufficient to cover in excess of UPCIC probable maximum loss 1-in-100 year              
Term Loan [Member]                
Debt Instrument [Line Items]                
Term Loan, net of unamortized discount 13,330,000us-gaap_LongTermLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		 18,490,000us-gaap_LongTermLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		            
Unsecured term loan agreement 14,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		 20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		           20,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
Surplus note maturity date May 23, 2016              
Effective interest rate 5.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		              
Stated interest rate on Term Loan 0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		              
Number of installments 3uve_NumberOfInstallments
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		              
Term Loan is amortized 3 years              
Amortization of discount $ 840,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember		 $ 601,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember