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Insurance Operations (Details) | Dec. 31, 2012 | Dec. 31, 2011
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In Florida [Member] |  |
Composition of Insurance Entities' aggregate policies-in-force |  |
Percentage of Policies-In-Force | 96.00% | 98.00%
With wind coverage [Member] |  |
Composition of Insurance Entities' aggregate policies-in-force |  |
Percentage of Policies-In-Force | 98.00% | 98.00%
With wind coverage in South Florida [Member] |  |
Composition of Insurance Entities' aggregate policies-in-force |  |
Percentage of Policies-In-Force | 28.00% | 32.00%

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- Details
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Namespace Prefix: | uve_
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