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Insurance Operations - Assets Held by Insurance Regulators (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Restricted Cash and Cash Equivalents [Member]    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 2,635us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_BalanceSheetLocationAxis
= uve_RestrictedCashAndCashEquivalentsMember
$ 2,600us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_BalanceSheetLocationAxis
= uve_RestrictedCashAndCashEquivalentsMember
Investments [Member]    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 3,609us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InvestmentsMember
$ 3,707us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InvestmentsMember