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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Premiums earned, net | $ 95,420us-gaap_PremiumsEarnedNet | $ 94,288us-gaap_PremiumsEarnedNet | $ 73,362us-gaap_PremiumsEarnedNet | $ 63,807us-gaap_PremiumsEarnedNet | $ 66,452us-gaap_PremiumsEarnedNet | $ 68,927us-gaap_PremiumsEarnedNet | $ 66,867us-gaap_PremiumsEarnedNet | $ 65,409us-gaap_PremiumsEarnedNet | $ 326,877us-gaap_PremiumsEarnedNet | $ 267,655us-gaap_PremiumsEarnedNet | $ 231,120us-gaap_PremiumsEarnedNet
Net investment income (expense) | 801us-gaap_NetInvestmentIncome | 644us-gaap_NetInvestmentIncome | 412us-gaap_NetInvestmentIncome | 518us-gaap_NetInvestmentIncome | 1,397us-gaap_NetInvestmentIncome | 382us-gaap_NetInvestmentIncome | 137us-gaap_NetInvestmentIncome | 12us-gaap_NetInvestmentIncome | 2,375us-gaap_NetInvestmentIncome | 1,928us-gaap_NetInvestmentIncome | 441us-gaap_NetInvestmentIncome
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 5,627us-gaap_MarketableSecuritiesRealizedGainLoss | (14,740)us-gaap_MarketableSecuritiesRealizedGainLoss | (11,943)us-gaap_MarketableSecuritiesRealizedGainLoss
Net change in unrealized gains (losses) on investments |  |  |  |  |  |  |  |  |  | 7,850us-gaap_MarketableSecuritiesUnrealizedGainLoss | 9,443us-gaap_MarketableSecuritiesUnrealizedGainLoss
Total premiums earned and other revenues | 104,482us-gaap_Revenues | 103,500us-gaap_Revenues | 86,989us-gaap_Revenues | 74,305us-gaap_Revenues | 77,580us-gaap_Revenues | 78,368us-gaap_Revenues | 77,756us-gaap_Revenues | 67,455us-gaap_Revenues | 369,276us-gaap_Revenues | 301,159us-gaap_Revenues | 269,939us-gaap_Revenues
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 118,397us-gaap_SellingGeneralAndAdministrativeExpense | 91,988us-gaap_SellingGeneralAndAdministrativeExpense | 91,193us-gaap_SellingGeneralAndAdministrativeExpense
Total operating costs and expenses | 67,556us-gaap_BenefitsLossesAndExpenses | 66,348us-gaap_BenefitsLossesAndExpenses | 56,580us-gaap_BenefitsLossesAndExpenses | 51,188us-gaap_BenefitsLossesAndExpenses | 51,587us-gaap_BenefitsLossesAndExpenses | 53,255us-gaap_BenefitsLossesAndExpenses | 48,068us-gaap_BenefitsLossesAndExpenses | 47,693us-gaap_BenefitsLossesAndExpenses | 241,672us-gaap_BenefitsLossesAndExpenses | 200,603us-gaap_BenefitsLossesAndExpenses | 217,380us-gaap_BenefitsLossesAndExpenses
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 127,604us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 100,556us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 52,559us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes |  |  |  |  |  |  |  |  | 54,616us-gaap_IncomeTaxExpenseBenefit | 41,579us-gaap_IncomeTaxExpenseBenefit | 22,247us-gaap_IncomeTaxExpenseBenefit
NET INCOME | 20,972us-gaap_NetIncomeLoss | 21,341us-gaap_NetIncomeLoss | 17,126us-gaap_NetIncomeLoss | 13,549us-gaap_NetIncomeLoss | 15,582us-gaap_NetIncomeLoss | 14,407us-gaap_NetIncomeLoss | 17,029us-gaap_NetIncomeLoss | 11,959us-gaap_NetIncomeLoss | 72,988us-gaap_NetIncomeLoss | 58,977us-gaap_NetIncomeLoss | 30,312us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Assumed premiums written |  |  |  |  |  |  |  |  |  |  | 10,686us-gaap_AssumedPremiumsWritten / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Premiums earned, net |  |  |  |  |  |  |  |  |  |  | 10,686us-gaap_PremiumsEarnedNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net investment income (expense) |  |  |  |  |  |  |  |  | (23)us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 207us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 625us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,947)us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,880)us-gaap_MarketableSecuritiesRealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in unrealized gains (losses) on investments |  |  |  |  |  |  |  |  |  | 1,625us-gaap_MarketableSecuritiesUnrealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,162us-gaap_MarketableSecuritiesUnrealizedGainLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Management fee |  |  |  |  |  |  |  |  | 121us-gaap_PaymentForManagementFee / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 134us-gaap_PaymentForManagementFee / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 142us-gaap_PaymentForManagementFee / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total premiums earned and other revenues |  |  |  |  |  |  |  |  | 723us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (981)us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,135us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 39,062us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32,476us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,051us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating costs and expenses |  |  |  |  |  |  |  |  | 39,062us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32,476us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,051us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | (38,339)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (33,457)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (14,916)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Benefit from income taxes |  |  |  |  |  |  |  |  | (16,403)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13,834)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,312)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (21,936)uve_LossBeforeEquityInNetEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (19,623)uve_LossBeforeEquityInNetEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,604)uve_LossBeforeEquityInNetEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 94,924uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 78,600uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,916uve_EquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
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

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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