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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
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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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