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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 403,939uve_AvailableForSaleSecuritiesContractualMaturities | $ 289,418uve_AvailableForSaleSecuritiesContractualMaturities
Percentage of total Fair Value | 100.00%uve_FixedMaturitiesFairValuePercentage | 100.00%uve_FixedMaturitiesFairValuePercentage
Standard & Poor's, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 31,783uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember | 82,889uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
Percentage of total Fair Value | 7.90%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember | 28.60%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
Standard & Poor's, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 207,953uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember | 120,976uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember
Percentage of total Fair Value | 51.50%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember | 41.80%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember
Standard & Poor's, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 79,675uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember | 46,689uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember
Percentage of total Fair Value | 19.70%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember | 16.10%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember
Standard & Poor's, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 45,781uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember | 38,114uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember
Percentage of total Fair Value | 11.30%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember | 13.20%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember
Standard & Poor's, BB- Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | 2,677uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBMinusRatingMember |
Percentage of total Fair Value | 0.70%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBMinusRatingMember |
Standard & Poor's, Not Rated [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 36,070uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember | $ 750uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember
Percentage of total Fair Value | 8.90%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember | 0.30%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember

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