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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Line Items]
Series A preferred stock pays a cumulative dividend					$ 1.00	$ 1.00	$ 1.00
Dividend paid to immediate parent company					$ 231,900,000	$ 149,900,000	$ 151,000,000
UPCIC
Equity [Line Items]
Dividend paid to immediate parent company					0	0	0
Capital contribution to subsidiaries					84,000,000	92,000,000	114,000,000
APPCIC
Equity [Line Items]
Dividend paid to immediate parent company					0	0
Capital contribution to subsidiaries					3,000,000	0	$ 0
Series A
Equity [Line Items]
Series A preferred stock pays a cumulative dividend	$ 0.25	$ 0.25	$ 0.25	$ 0.25
Preferred stock aggregate dividends					$ 10,000	$ 10,000

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 https://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

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Balance Type:	debit
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X

- Definition

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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X

- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

No definition available.

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X

- Definition

Capital Contribution To Subsidiaries

+ References

No definition available.

+ Details

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Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Equity.

+ References

No definition available.

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