XML 49 R35.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments - Schedule of Credit Quality of Available-for-sale Debt Securities With Contractual Maturities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 760,408 | $ 649,334
Percentage of Total Fair Value | 100.00% | 100.00%
Comparable Ratings, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 344,801 | $ 317,313
Percentage of Total Fair Value | 45.30% | 48.90%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 92,411 | $ 129,573
Percentage of Total Fair Value | 12.20% | 20.00%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 216,074 | $ 146,749
Percentage of Total Fair Value | 28.40% | 22.60%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 103,427 | $ 51,020
Percentage of Total Fair Value | 13.60% | 7.80%
Comparable Ratings, BB+ and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 117 | $ 1,569
Percentage of Total Fair Value | 0.00% | 0.20%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 3,578 | $ 3,110
Percentage of Total Fair Value | 0.50% | 0.50%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Available for sale debt securities and marketable securities. + References No definition available. + Details
Name: | uve_AvailableForSaleDebtSecuritiesAndMarketableSecurities
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of certain securities (as a percentage) out of total fixed maturities securities. + References No definition available. + Details
Name: | uve_FixedMaturitiesFairValuePercentage
Namespace Prefix: | uve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_AAARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_AARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_ARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_BBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_BBPlusAndBelowRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_CreditRatingSourceAxis=uve_NoRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |