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Reinsurance - Current Ratings from Rating Agencies and Unsecured Net Amounts Due from Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 184,989uve_ReinsuranceUnsecuredAmountsDueFromReinsurers | $ 263,572uve_ReinsuranceUnsecuredAmountsDueFromReinsurers
Everest Reinsurance Company [Member] | AM Best, A+ Rating [Member] | Standard & Poor's, A+ Rating [Member] | Moody's, A1 Rating [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 16,780uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_EverestReinsuranceCompanyMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA1RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAPlusRatingMember | 87,789uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_EverestReinsuranceCompanyMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA1RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAPlusRatingMember
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 31,870uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_FloridaHurricaneCatastropheFundMember | 33,593uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_FloridaHurricaneCatastropheFundMember
Odyssey Reinsurance Company [Member] | AM Best, A Rating [Member] | Standard & Poor's, A- Rating [Member] | Moody's, A3 Rating [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 136,339uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_OdysseyReinsuranceCompanyMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAMinusRatingMember | $ 142,190uve_ReinsuranceUnsecuredAmountsDueFromReinsurers / us-gaap_CededCreditRiskAxis = uve_OdysseyReinsuranceCompanyMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAMinusRatingMember

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- Definition Represents total unsecured net amounts due from reinsurers whose aggregate balance exceeded 3% of stockholders' equity as of the reporting date. + References No definition available. + Details
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