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Insurance Operations - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Jul. 01, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
UPCIC (1) (2)
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company			$ 0	$ 0	$ 0
APPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company			$ 0	0
UPCIC and APPCIC
Statutory Accounting Practices [Line Items]
Minimum capitalization rate	10.00%	10.00%
UPCIC and APPCIC | Minimum
Statutory Accounting Practices [Line Items]
Minimum capitalization amount	$ 15,000,000			$ 10,000,000

X

- Definition

This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

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Period Type:	duration

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

Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the minimum amount of capitalization required by regulatory agencies as a percentage of total liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	uve_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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- Details

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- Details

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