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Stockholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 02, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Equity [Line Items] |  |  |  |  |  |  |  |
Contingently redeemable common stock, issued shares | 1,000,000us-gaap_TemporaryEquitySharesIssued | 1,000,000us-gaap_TemporaryEquitySharesIssued | 1,000,000us-gaap_TemporaryEquitySharesIssued |  | 1,000,000us-gaap_TemporaryEquitySharesIssued |  |  |
Redeemable Common Stock. price per share | $ 19.00us-gaap_TemporaryEquityRedemptionPricePerShare |  |  |  |  |  |  |
Redeemable Common Stock, required holding period | 6 months |  |  |  |  |  |  |
Redeemable Common Stock, contract terms |  | Ananke is required to hold the shares of common stock for a minimum of six months and then may: 1) sell up to one-third during the next three-month period, 2) sell another one-third during the next three-month period and 3) sell the remaining purchased thereafter. |  |  |  |  |  |
Shares repurchased during period |  | $ 29,736,000us-gaap_TreasuryStockValueAcquiredCostMethod | $ 32,366,000us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |
Received distributions from the earnings of subsidiaries |  | 55,800,000us-gaap_ProceedsFromContributionsFromAffiliates | 26,900,000us-gaap_ProceedsFromContributionsFromAffiliates | 40,200,000us-gaap_ProceedsFromContributionsFromAffiliates |  |  |  |
Capital contributions to subsidiaries |  |  |  | 28,600,000us-gaap_PaymentsOfDistributionsToAffiliates |  |  |  |
Pro-Forma [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Contingently redeemable common stock, issued shares | 1,000,000us-gaap_TemporaryEquitySharesIssued / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |  |  |  |  |  |  |
Redeemable Common Stock. price per share | $ 19.00us-gaap_TemporaryEquityRedemptionPricePerShare / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember |  |  |  |  |  |  |
Redeemable Common Stock, required holding period | 6 months |  |  |  |  |  |  |
Redeemable Common Stock, contract terms |  | Ananke is required to hold the shares of common stock for a minimum of six months and then may: 1) sell up to one-third during the next three-month period, 2) sell another one-third during the next three-month period and 3) sell the remaining purchased thereafter. |  |  |  |  |  |
Open Market [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Treasury shares acquired |  | 1,166,208us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = uve_OpenMarketMember |  |  |  |  |  |
Shares repurchased during period |  | 15,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = uve_OpenMarketMember |  |  |  |  |  |
Company's Director [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Treasury shares acquired |  |  | 241,933us-gaap_TreasuryStockSharesAcquired / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |
Shares repurchased during period |  |  | 1,800,000us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |
Former Board of Directors Chairman [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Treasury shares acquired |  | 1,225,000us-gaap_TreasuryStockSharesAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember | 7,016,000us-gaap_TreasuryStockSharesAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember |  |  |  |  |
Shares repurchased during period |  | 14,700,000us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember | 30,500,000us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember |  |  |  |  |
Percentage of common stock owned |  | 3.00%uve_CommonStockOwnedPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember |  |  | 3.00%uve_CommonStockOwnedPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uve_FormerBoardOfDirectorsChairmanMember |  |  |
Series A [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  |  |  |  | $ 0.25us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.25us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.25us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.25us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preferred stock aggregate dividends |  | 13,000us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 20,000us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Conversion of preferred shares into common stock |  | 9,975us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 0us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Conversion of preferred stock, shares |  | 24,938us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |
Series M [Member] |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |
Series A preferred stock pays a cumulative dividend |  | $ 0.20us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember |  |  |  |  |  |
Preferred stock aggregate dividends |  | $ 400us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember | $ 9,000us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember |  |  |  |  |
Conversion of preferred shares into common stock |  | 8,000us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember | 77,740us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember |  |  |  |  |
Conversion of preferred stock, shares |  | 40,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember | 388,700us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = uve_SeriesMPreferredStockMember |  |  |  |  |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Significant terms of equity contract classified as temporary equity to issue additional shares. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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