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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 403,939uve_AvailableForSaleSecuritiesContractualMaturities	$ 289,418uve_AvailableForSaleSecuritiesContractualMaturities
Moody's, Baa3 Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	268uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember
Moody's, Aaa Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 7,900uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysAaaRatingMember

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Amount of available for sale securities with contractual maturities.

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