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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) $ in Thousands	Dec. 31, 2016 USD ($)
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 46,364
Florida Hurricane Catastrophe Fund [Member]
Ceded Credit Risk [Line Items]
Reinsurance unsecured amounts due from reinsurers total	$ 46,364

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

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

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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

Name:	uve_ReinsuranceUnsecuredAmountsDueFromReinsurers
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CededCreditRiskAxis=uve_FloridaHurricaneCatastropheFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: