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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
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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