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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jun. 01, 2016	Mar. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Minimum annual spend towards covered loss	$ 5,000	$ 4,100
Amount incurred towards minimum annual spending		$ 900
Agreement, terms period		June 1, 2016 through May 31, 2025
Agreement, terms expiration date		May 31, 2017

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- References

No definition available.

+ Details

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

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Description of the nature and terms of commitment.

+ References

No definition available.

+ Details

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

X

- Definition

Agreement, terms expiration date, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	uve_AgreementTermsExpirationDate
Namespace Prefix:	uve_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Covered loss index swaps, amount incurred towards minimum annual spending.

+ References

No definition available.

+ Details

Name:	uve_CoveredLossIndexSwapsAmountIncurredTowardsMinimumAnnualSpending
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration