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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Significant Accounting Policies [Line Items]          
Maximum maturity period of highly liquid investments   3 months      
Allowances for doubtful accounts   $ 357,000us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts   $ 446,000us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts  
Accruals for premium deficiency   0uve_PremiumDeficiencyAccruals   0uve_PremiumDeficiencyAccruals  
Deferred policy acquisition costs   25,660,000us-gaap_DeferredPolicyAcquisitionCosts 11,355,000us-gaap_DeferredPolicyAcquisitionCosts 15,899,000us-gaap_DeferredPolicyAcquisitionCosts 17,282,000us-gaap_DeferredPolicyAcquisitionCosts
Deferred policy acquisition costs, net, difference percentage     13.00%uve_DeferredPolicyAcquisitionCostsNetDifferencePercentage    
Deferred policy acquisition costs, pre-tax charge against earnings 1,600,000uve_DeferredPolicyAcquisitionCostsNetDifferenceAmount        
Maximum amortization period for capitalized cost   12 months      
Maximum [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Amount insured per depositor under FDIC insurance coverage   250,000us-gaap_CashFDICInsuredAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Useful life of property and equipment   27 years 6 months      
Number of installments to pay policy premiums   4uve_NumberOfInstallmentsToPayPolicyPremiums
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Maximum [Member] | Acquisition-Related Costs [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Deferred policy acquisition costs     13,000,000us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Minimum          
Schedule Of Significant Accounting Policies [Line Items]          
Short-term investment maturity period   3 months      
Useful life of property and equipment   3 years      
Number of installments to pay policy premiums   2uve_NumberOfInstallmentsToPayPolicyPremiums
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Minimum | Acquisition-Related Costs [Member]          
Schedule Of Significant Accounting Policies [Line Items]          
Deferred policy acquisition costs     $ 11,400,000us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_NonrecurringAdjustmentAxis
= us-gaap_AcquisitionRelatedCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember