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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	$ 300,094	$ 93,306
June 1, 2019 - May 31, 2020 [Member]
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	117,600
June 1, 2020 - May 31, 2021 [Member]
Reinsurance Retention Policy [Line Items]
Reinsurance payable, net	$ 83,600

X

- Definition

The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(a)(3),(c))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ 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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=uve_PeriodFromJuneOneTwoThousandTwentyToMayThirtyOneTwoThousandTwentyOneMember
Namespace Prefix:
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Balance Type:
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