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Investments - Amortized Cost and Fair Value 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]
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost	$ 101,406us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	185,184us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	3,067us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	3,593us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Fixed Maturities Securities Available for Sale, Amortized cost, Total	404,941us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	101,368us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	184,457us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	3,057us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	3,673us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Fixed Maturities Securities Available for Sale, Fair Value, Total	403,939uve_AvailableForSaleSecuritiesContractualMaturities	289,418uve_AvailableForSaleSecuritiesContractualMaturities
Mortgage-Backed and Asset-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Amortized cost	107,589us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_InvestmentTypeAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	107,223us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_InvestmentTypeAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Perpetual Maturity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	4,102uve_AvailableForSaleSecuritiesDebtMaturitiesPerpetualMaturityDateAmortizedCost / us-gaap_InvestmentTypeAxis = uve_PerpetualMaturitySecuritiesMember
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	$ 4,161uve_AvailableForSaleSecuritiesDebtMaturitiesPerpetualMaturityDateFairValue / us-gaap_InvestmentTypeAxis = uve_PerpetualMaturitySecuritiesMember

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available for sale securities with contractual maturities.

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