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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	$ 407,852us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 426,568us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value	406,814us-gaap_AvailableForSaleSecurities	423,581us-gaap_AvailableForSaleSecurities
Mortgage-backed securities [Member] | Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	66,366us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_AgencySecuritiesMember	64,905us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_AgencySecuritiesMember
Fair Value	66,526us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_AgencySecuritiesMember	64,619us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_AgencySecuritiesMember
Mortgage-backed securities [Member] | Non Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	9,833us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = uve_NonAgencyMember	8,053us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = uve_NonAgencyMember
Fair Value	9,849us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = uve_NonAgencyMember	7,987us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_UnderlyingAssetClassAxis = uve_NonAgencyMember
Asset-backed securities [Member] | Auto Loans [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	15,247us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedAutoLoansMember	16,551us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedAutoLoansMember
Fair Value	15,307us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedAutoLoansMember	16,556us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedAutoLoansMember
Asset-backed securities [Member] | Credit Card Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	13,483us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CreditCardReceivablesMember	13,481us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CreditCardReceivablesMember
Fair Value	13,472us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CreditCardReceivablesMember	13,457us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CreditCardReceivablesMember
Asset-backed securities [Member] | Other Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	4,600us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	4,599us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember
Fair Value	4,617us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	4,604us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember
Mortgage-Backed and Asset-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	109,529us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember	107,589us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Fair Value	$ 109,771us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember	$ 107,223us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

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X

- Definition

This item represents the cost of debt and equity 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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