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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Investment Income [Line Items]
Total investment income	$ 1,345uve_InvestmentIncomeInterestAndDividendIncludingAccretionAmortization	$ 1,042uve_InvestmentIncomeInterestAndDividendIncludingAccretionAmortization
Less: Investment expenses	(483)us-gaap_InvestmentIncomeInvestmentExpense	(524)us-gaap_InvestmentIncomeInvestmentExpense
Net investment (expense) income	862us-gaap_NetInvestmentIncome	518us-gaap_NetInvestmentIncome
Fixed Maturities [Member]
Net Investment Income [Line Items]
Investment income	1,184us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	728us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	57us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	302us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Short-term Investments [Member]
Net Investment Income [Line Items]
Investment income	38us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Other [Member]
Net Investment Income [Line Items]
Investment income	$ 66us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember	$ 12us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember

X

- 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

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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

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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.

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