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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (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
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total investment income |  |  |  |  |  |  |  |  | $ 4,446uve_InvestmentIncomeInterestAndDividendIncludingAccretionAmortization | $ 3,550uve_InvestmentIncomeInterestAndDividendIncludingAccretionAmortization | $ 1,337uve_InvestmentIncomeInterestAndDividendIncludingAccretionAmortization
Less: Investment expenses |  |  |  |  |  |  |  |  | (2,071)us-gaap_InvestmentIncomeInvestmentExpense | (1,622)us-gaap_InvestmentIncomeInvestmentExpense | (896)us-gaap_InvestmentIncomeInvestmentExpense
Net investment (expense) income | 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
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 83uve_InvestmentIncomeOnCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember | 148uve_InvestmentIncomeOnCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember | 705uve_InvestmentIncomeOnCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 3,329us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 1,420us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 66us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 988us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 1,982us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 566us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | $ 46us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |  |

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 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 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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- Definition Amount of income earned from investments in securities. Includes, but is not limited to, dividends, interest, and amortization of premium/discount. Excludes realized gain (loss) on investments. + References No definition available. + Details
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