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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company		$ 231,900,000	$ 149,900,000	$ 151,000,000
Surplus insurance entities		$ (141,777,000)	(102,515,000)	(104,339,000)
Surplus accrued variable rate		8.27%
Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary		$ 134,000,000
UPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries		84,000,000	92,000,000	114,000,000
Dividend paid to immediate parent company		0	0	0
UPCIC | Subsequent Event
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries	$ 72,000,000
UPCIC | Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary		110,000,000	20,000,000
APPCIC
Statutory Accounting Practices [Line Items]
Capital contribution to subsidiaries		3,000,000	0	$ 0
Dividend paid to immediate parent company		0	$ 0
APPCIC | Subordinated Surplus Debenture
Statutory Accounting Practices [Line Items]
Issuance of note receivable to subsidiary		$ 4,000,000

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

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X

- Definition

The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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- 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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X

- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ 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(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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- Definition

Capital Contribution To Subsidiaries

+ References

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- Definition

Statutory Accounting Practices, Statutory Accrued Variable Rate

+ References

No definition available.

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Namespace Prefix:	uve_
Data Type:	dtr-types:percentItemType
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