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Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Surplus Note [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value	$ 15,073	$ 15,809
Surplus Note [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated fair value	13,723	14,166
Term Loan [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value		6,851
Term Loan [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated fair value		6,851
Promissory Note [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value	690	1,390
Promissory Note [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated fair value	$ 690	$ 1,390

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Fair value inputs assets liabilities quantitative information.

+ References

No definition available.

+ Details

Name:	uve_FairValueInputsAssetsLiabilitiesQuantitativeInformationLineItems
Namespace Prefix:	uve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=uve_SurplusNoteMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=uve_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=uve_PromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: