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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 385,418uve_AvailableForSaleSecuritiesContractualMaturities	$ 403,939uve_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	31,671uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember	31,783uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
Percentage of total Fair Value	8.20%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember	7.90%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
Standard & Poor's, AA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	186,057uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember	207,953uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember
Percentage of total Fair Value	48.40%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember	51.50%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAARatingMember
Standard & Poor's, A Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	82,613uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember	79,675uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember
Percentage of total Fair Value	21.40%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember	19.70%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsARatingMember
Standard & Poor's, BBB Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	45,137uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember	45,781uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember
Percentage of total Fair Value	11.70%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember	11.30%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBBRatingMember
Standard & Poor's, BB+ Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	3,210uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBPlusRatingMember	2,677uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBPlusRatingMember
Percentage of total Fair Value	0.80%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBPlusRatingMember	0.70%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsBBPlusRatingMember
Standard & Poor's, Not Rated [Member]
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 36,730uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember	$ 36,070uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember
Percentage of total Fair Value	9.50%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember	8.90%uve_FixedMaturitiesFairValuePercentage / us-gaap_CreditRatingStandardPoorsAxis = uve_StandardPoorsNotRatedMember

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