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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 190,505us-gaap_PrepaidReinsurancePremiums $ 241,214us-gaap_PrepaidReinsurancePremiums    
Reinsurance recoverable on unpaid losses and LAE 47,350us-gaap_ReinsuranceRecoverablesOnUnpaidLosses 68,584us-gaap_ReinsuranceRecoverablesOnUnpaidLosses 81,415us-gaap_ReinsuranceRecoverablesOnUnpaidLosses 88,002us-gaap_ReinsuranceRecoverablesOnUnpaidLosses
Reinsurance recoverable on paid losses 7,837us-gaap_ReinsuranceRecoverablesOnPaidLosses 39,263us-gaap_ReinsuranceRecoverablesOnPaidLosses    
Reinsurance receivable, net 7,468us-gaap_ReinsuranceReceivablesPaidLossesRecoverable 203us-gaap_ReinsuranceReceivablesPaidLossesRecoverable    
Reinsurance recoverable and receivable $ 62,655uve_ReinsuranceRecoverablesAndReceivables $ 108,050uve_ReinsuranceRecoverablesAndReceivables