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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (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] |  |
Cost or Amortized Cost | $ 426,568us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 355,052us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 514us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 3,541us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses | (3,501)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (4,153)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value | 423,581us-gaap_AvailableForSaleSecurities | 354,440us-gaap_AvailableForSaleSecurities
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 120,627us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 105,229us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Gains | 38us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 19us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Losses | (627)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | (1,033)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Fair Value | 120,038us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 104,215us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 120,025us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 94,708us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains | 171us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 265us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses | (364)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | (770)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value | 119,832us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 94,203us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 107,589us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | 91,502us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Fair Value | 107,223us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | 91,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 107,589us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | 91,502us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Gross Unrealized Gains | 136us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | 75us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Gross Unrealized Losses | (502)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | (577)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Fair Value | 107,223us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember | 91,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MortgageBackedAndAssetBackedSecuritiesMember
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 6,700us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember |
Gross Unrealized Gains | 165us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember |
Gross Unrealized Losses | (9)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember |
Fair Value | 6,856us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember |
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 331us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 8,500us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Gains | 4us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 916us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Gross Unrealized Losses | (65)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | (121)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Fair Value | 270us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember | 9,295us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 21,296us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember | 55,113us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember
Gross Unrealized Gains |  | 2,266us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember
Gross Unrealized Losses | (1,924)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember | (1,652)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember
Fair Value | 19,372us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember | 55,727us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uve_MutualFundsMember
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 50,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember |
Gross Unrealized Losses | (10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember |
Fair Value | $ 49,990us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ShortTermInvestmentsMember |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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