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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable (Payable) and Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Reinsurance Disclosures [Abstract]
Prepaid reinsurance premiums	$ 212,489		$ 124,385
Reinsurance recoverable on unpaid losses and LAE	412,697	$ 1,393	106	$ 1,904	$ 2,958	$ 13,540
Reinsurance recoverable (payable) on paid losses			(1,532)
Reinsurance receivable, net			186
Reinsurance recoverable (payable) and receivable	$ 412,697		$ (1,240)

X

- Definition

The unexpired portion of premiums ceded on policies in force as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 340
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507

+ Details

Name:	us-gaap_PrepaidReinsurancePremiums
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Reinsurance receivable, net.

+ References

No definition available.

+ Details

Name:	uve_ReinsuranceReceivableNet
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all reinsurance recoverable (payable) and receivable.

+ References

No definition available.

+ Details

Name:	uve_ReinsuranceRecoverablePayableAndReceivable
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reinsurance recoverable (payable) for unpaid claims and claims adjustments.

+ References

No definition available.

+ Details

Name:	uve_ReinsuranceRecoverablePayableForUnpaidClaimsAndClaimsAdjustments
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after valuation allowance, recoverable (payable) under reinsurance contracts for losses reported to and paid by the ceding insurer.

+ References

No definition available.

+ Details

Name:	uve_ReinsuranceRecoverablePayableOnPaidLosses
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant