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Reinsurance (Details Textual) (USD $) In Billions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Reinsurance and Insurance Operations (Textual) [Abstract] |  |
In-force policyholder coverage for windstorm exposures | $ 126.9 |
Percentage of premium ceded | 45.00% | 50.00%
Percentage reduction of premium ceded | 5.00% |

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- Definition In force policyholder coverage for windstorm exposures. + References No definition available. + Details
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- Definition Percentage of premium ceded. + References No definition available. + Details
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- Definition Percentage reduction of premium ceded. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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