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Commitments and Contingencies - Additional Information (Detail) $ in Millions | Sep. 30, 2020 USD ($)
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June 1, 2020 - May 31, 2021 [Member] |
Reinsurance Retention Policy [Line Items] |
Reinsurance payable, next twelve months | $ 128.3
June 1, 2019 - May 31, 2020 [Member] |
Reinsurance Retention Policy [Line Items] |
Reinsurance payable, due in second year | $ 71.3

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- Definition Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ReinsuranceRetentionPolicyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ReinsurancePolicyTypeAxis=uve_PeriodFromJuneOneTwoThousandTwentyToMayThirtyOneTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |