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Insurance Operations - Composition of Insurance Entities' Aggregate Policies-In-Force (Detail) | Sep. 30, 2013 | Dec. 31, 2012
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In Florida [Member] |  |
Statutory Accounting Practices [Line Items] |  |
Percentage of Policies-In-Force | 94.00% | 96.00%
With Wind Coverage [Member] |  |
Statutory Accounting Practices [Line Items] |  |
Percentage of Policies-In-Force | 98.00% | 98.00%
With Wind Coverage in South Florida [Member] |  |
Statutory Accounting Practices [Line Items] |  |
Percentage of Policies-In-Force | 27.00% | 28.00%

X
- Details
Name: | us-gaap_StatutoryAccountingPracticesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of policies in force. + References No definition available. + Details
Name: | uve_PercentageOfPoliciesInForce
Namespace Prefix: | uve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant