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Related Party Transactions - Additional Information (Detail) (SPC Global RE Advisors LLC [Member], USD $)
Mar. 31, 2015
Dec. 31, 2014
SPC Global RE Advisors LLC [Member]
   
Related Party Transaction [Line Items]    
Payments due to related party $ 0us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uve_SPCGlobalReAdvisorsLLCMember
$ 0us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uve_SPCGlobalReAdvisorsLLCMember