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Related Party Transactions - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
May 23, 2013 | Dec. 31, 2014 | Dec. 31, 2013
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
RenRe Ventures [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Repurchase of shares | 2uve_MaximumCommonStockRepurchaseRofr / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_RenReVenturesMember |  |
Percentage of outstanding common stock | 4.99%uve_MaximumCommonStockRepurchaseRofrPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_RenReVenturesMember |  |
RenRe Ventures [Member] | Maximum [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of common stock owned |  | 3.00%uve_CommonStockOwnedPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_RenReVenturesMember |

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- Details
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