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Insurance Operations - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
UPCIC [Member]
Statutory Accounting Practices [Line Items]
Statutory ordinary dividend capacity	$ 27,700,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uve_UniversalPropertyAndCasualtyInsuranceCompanyMember
UPCIC and APPCIC [Member]
Statutory Accounting Practices [Line Items]
Dividend paid to UIHCF	0uve_DividendIncomeFromSubsidiary / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uve_AmericanPlatinumPropertyAndCasualtyInsuranceCompanyAndUniversalPropertyAndCasualtyInsuranceCompanyMember
Minimum capitalization rate	10.00%uve_MinimumCapitalizationRate / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uve_AmericanPlatinumPropertyAndCasualtyInsuranceCompanyAndUniversalPropertyAndCasualtyInsuranceCompanyMember
Statutory Accounting Practices, Statutory Capital and Surplus Required	$ 5,000,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uve_AmericanPlatinumPropertyAndCasualtyInsuranceCompanyAndUniversalPropertyAndCasualtyInsuranceCompanyMember
Minimum capital required	Greater of ten percent of the insurer's total liabilities or $5.0 million.

X

- Definition

For insurance companies, a description of the minimum regulatory capital requirements imposed by state insurance regulators, and restrictions on dividend payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 505

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

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

X

- Details

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

X

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Article 4

+ Details

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

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://www.xbrl.org/2003/role/presentationRef

-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

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

X

- Definition

Represents the dividend amount paid by an insurance company to their immediate parent company.

+ References

No definition available.

+ Details

Name:	uve_DividendIncomeFromSubsidiary
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	uve_MinimumCapitalizationRate
Namespace Prefix:	uve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=uve_AmericanPlatinumPropertyAndCasualtyInsuranceCompanyAndUniversalPropertyAndCasualtyInsuranceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=uve_UniversalPropertyAndCasualtyInsuranceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: