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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net income | $ 72,988us-gaap_NetIncomeLoss | $ 58,977us-gaap_NetIncomeLoss | $ 30,312us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of share-based compensation | 12,342us-gaap_ShareBasedCompensation | 6,417us-gaap_ShareBasedCompensation | 3,830us-gaap_ShareBasedCompensation
Amortization of original issue discount on debt | 840us-gaap_AmortizationOfDebtDiscountPremium | 601us-gaap_AmortizationOfDebtDiscountPremium |
Accretion of deferred credit | (840)us-gaap_AccretionExpense | (601)us-gaap_AccretionExpense |
Net realized (gains) losses on investments | (5,627)us-gaap_MarketableSecuritiesRealizedGainLoss | 14,740us-gaap_MarketableSecuritiesRealizedGainLoss | 11,943us-gaap_MarketableSecuritiesRealizedGainLoss
Net change in unrealized (gains) losses on investments |  | (7,850)us-gaap_MarketableSecuritiesUnrealizedGainLoss | (9,443)us-gaap_MarketableSecuritiesUnrealizedGainLoss
Deferred income taxes | 1,118us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 7,363us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 3,813us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Excess tax benefits from share-based compensation | (7,006)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (359)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 1,760us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Other | 19us-gaap_OtherNoncashIncomeExpense | 10us-gaap_OtherNoncashIncomeExpense | 5us-gaap_OtherNoncashIncomeExpense
Net change in assets and liabilities relating to operating activities: |  |  |
Restricted cash and cash equivalents | (35)us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities | 30,409us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities | 45,304us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities
Purchases of equity securities, trading |  | (26,009)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities | (343,962)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities
Proceeds from sale of equity securities, trading |  | 102,661us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 360,000us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities
Income taxes recoverable | 2,477us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | (5,558)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | (2,594)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Income taxes payable | 6,239us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 2,226us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (13,801)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by (used in) operating activities | 123,346us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 156,959us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 142,506us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |  |
Purchases of equity securities, available for sale | (116,541)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity | (77,859)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity |
Purchases of fixed maturities, available for sale | (106,885)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt | (305,330)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt |
Proceeds from sales of equity securities, available for sale | 163,981us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity | 15,542us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity |
Proceeds from sales of fixed maturities, available for sale | 17,153us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt |  |
Net cash provided by (used in) investing activities | (77,188)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (352,683)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (2,698)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |  |
Proceeds from borrowings |  | 20,000us-gaap_ProceedsFromIssuanceOfLongTermDebt |
Repayment of debt | (7,471)us-gaap_RepaymentsOfDebt | (1,471)us-gaap_RepaymentsOfDebt | (1,471)us-gaap_RepaymentsOfDebt
Preferred stock dividend | (13)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (29)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | (287)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Common stock dividend | (19,240)us-gaap_PaymentsOfDividendsCommonStock | (17,725)us-gaap_PaymentsOfDividendsCommonStock | (18,669)us-gaap_PaymentsOfDividendsCommonStock
Issuance of common stock | 73us-gaap_ProceedsFromIssuanceOfCommonStock |  | 207us-gaap_ProceedsFromIssuanceOfCommonStock
Purchase of treasury stock | (29,736)us-gaap_PaymentsForRepurchaseOfCommonStock | (32,366)us-gaap_PaymentsForRepurchaseOfCommonStock |
Payments related to tax withholding for share-based compensation | (17,655)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | (3,161)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | (121)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefits (shortfall) from share-based compensation | 7,006us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 359us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | (1,760)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by (used in) financing activities | (48,036)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (34,393)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (22,101)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents | (1,878)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (230,117)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 117,707us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 117,275us-gaap_CashAndCashEquivalentsAtCarryingValue | 347,392us-gaap_CashAndCashEquivalentsAtCarryingValue | 229,685us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 115,397us-gaap_CashAndCashEquivalentsAtCarryingValue | 117,275us-gaap_CashAndCashEquivalentsAtCarryingValue | 347,392us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 72,988us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 58,977us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30,312us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in net income of subsidiaries | (94,924)uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (78,600)uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (38,916)uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Distribution of income from subsidiaries | 55,805us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 26,898us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40,222us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation | 2us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Amortization of share-based compensation | 12,342us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,417us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,830us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of original issue discount on debt | 840us-gaap_AmortizationOfDebtDiscountPremium / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 601us-gaap_AmortizationOfDebtDiscountPremium / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Accretion of deferred credit | (840)us-gaap_AccretionExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (601)us-gaap_AccretionExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net realized (gains) losses on investments | (625)us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,947us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,880us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in unrealized (gains) losses on investments |  | (1,625)us-gaap_MarketableSecuritiesUnrealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,162)us-gaap_MarketableSecuritiesUnrealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income taxes | 1,118us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,363us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,813us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefits from share-based compensation | (7,006)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (359)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,760us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in assets and liabilities relating to operating activities: |  |  |
Restricted cash and cash equivalents |  |  | 30,220us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of equity securities, trading |  | (3,972)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (58,836)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from sale of equity securities, trading |  | 16,712us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,379us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes recoverable | 2,477us-gaap_IncreaseDecreaseInIncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,558)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,594)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income taxes payable | 6,239us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,226us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13,801)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other operating assets and liabilities | 5,752us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,347us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,911us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) operating activities | 54,168us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32,773us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,018us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Capital contributions to subsidiaries | (5,585)uve_ProceedsFromCapitalContributionsAndLoansToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,600)uve_ProceedsFromCapitalContributionsAndLoansToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28,555)uve_ProceedsFromCapitalContributionsAndLoansToSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of equity securities, available for sale | (15,836)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10,357)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Purchases of fixed maturities, available for sale | (3,000)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (750)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from sales of equity securities, available for sale | 26,060us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from sales of fixed maturities, available for sale | 770us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash provided by (used in) investing activities | 2,409us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,707)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28,555)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities: |  |  |
Proceeds from borrowings |  | 20,000us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Repayment of debt | (6,000)us-gaap_RepaymentsOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Preferred stock dividend | (13)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (29)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (287)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock dividend | (19,240)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17,725)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (18,669)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of common stock | 73us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 207us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of treasury stock | (29,736)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (32,365)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds received from issuance of common and contingently redeemable common stock | 19,000us-gaap_ProceedsFromSaleOfTreasuryStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Payments related to tax withholding for share-based compensation | (17,655)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,161)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (121)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefits (shortfall) from share-based compensation | 7,006us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 359us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,760)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | (46,565)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (32,921)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (20,630)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | 10,012us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,855)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,833us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period | 4,878us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,733us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,900us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | $ 14,890us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 4,878us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 17,733us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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