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Commitments and Contingencies (Detail) - Multi-Year Reinsurance Contracts - USD ($) $ in Millions	Mar. 26, 2021	Jun. 30, 2021
Reinsurance Retention Policy [Line Items]
Term of reinsurance agreement	3 years
Reinsurance payable, due in fiscal year		$ 94.3
Reinsurance payable, due in second year		138.2
Reinsurance payable, due in third year		$ 72.1

X

- 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

X

- Definition

Amount of commitment classified as other to be paid in third 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

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other Commitment, Term

+ References

No definition available.

+ Details

Name:	uve_OtherCommitmentTerm
Namespace Prefix:	uve_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=uve_MultiYearReinsuranceContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: