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Reinsurance - Summary of Quota-Share Cession Rates by Reinsurance Program (Detail)	12 Months Ended
	Dec. 31, 2014
June 2011 - May 2012
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	50.00%uve_QuotaShareCessionRateByReinsuranceProgramAndYear / us-gaap_ReinsurancePolicyTypeAxis = uve_ReinsuranceProgramEffectiveJuneTwoThousandElevenToMayTwoThousandTwelveMember
June 2012 - May 2013
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	45.00%uve_QuotaShareCessionRateByReinsuranceProgramAndYear / us-gaap_ReinsurancePolicyTypeAxis = uve_ReinsuranceProgramEffectiveJuneTwoThousandTwelveToMayTwoThousandThirteenMember
June 2013 - May 2014
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	45.00%uve_QuotaShareCessionRateByReinsuranceProgramAndYear / us-gaap_ReinsurancePolicyTypeAxis = uve_ReinsuranceProgramEffectiveJuneTwoThousandThirteenToMayTwoThousandFourteenMember
June 2014 - May 2015
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	30.00%uve_QuotaShareCessionRateByReinsuranceProgramAndYear / us-gaap_ReinsurancePolicyTypeAxis = uve_ReinsuranceProgramEffectiveJuneTwoThousandFourteenToMayTwoThousandFifteenMember

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- Definition

Quota-share cession rate by reinsurance program and year in effect.

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