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Quarterly Results for 2014 and 2013 - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014
Condensed Income Statements Captions [Line Items] |  |
Increase in revenue during period | $ 26.9uve_IncreaseInRevenueDuringPeriod |
Increase in operating expenses | $ 16.0uve_IncreaseDecreaseInOperatingExpenses |
Maximum [Member] |  |
Condensed Income Statements Captions [Line Items] |  |
Percentage of quota-share cession rate |  | 45.00%uve_PercentageOfQuotaShareCessionRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum |  |
Condensed Income Statements Captions [Line Items] |  |
Percentage of quota-share cession rate |  | 30.00%uve_PercentageOfQuotaShareCessionRate / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Details
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X
- Definition Increase decrease in operating expenses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Percentage of quota share cession rate. + References No definition available. + Details
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Namespace Prefix: | uve_
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Balance Type: | na
Period Type: | duration

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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |