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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

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

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

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- 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

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |