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Long-Term Debt - Principal Amount and Unamortized Original Issue Discount (Detail) (Term Loan [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
May 23, 2013
Term Loan [Member]
     
Debt Instrument [Line Items]      
Principal amount $ 14,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
$ 20,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
$ 20,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
Less: Unamortized discount (670)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
(1,510)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
 
Term Loan, net of unamortized discount $ 13,330us-gaap_LongTermLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember
$ 18,490us-gaap_LongTermLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= uve_TermLoanMember