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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 385,418uve_AvailableForSaleSecuritiesContractualMaturities	$ 403,939uve_AvailableForSaleSecuritiesContractualMaturities
Moody's, Baa3 or Baa2 Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	675uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingMoodysAxis = uve_MoodysBaa3OrBaa2RatingMember
Moody's, Aaa or Aa3 Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 18,900uve_AvailableForSaleSecuritiesContractualMaturities / us-gaap_CreditRatingMoodysAxis = uve_MoodysAaaOrAa3RatingMember

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Amount of available for sale securities with contractual maturities.

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