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Significant Accounting Policies - Unsecured Net Amounts Due from Reinsurers Whose Aggregate Balance Exceeded 3% of Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 235,987 | $ 268,458
Everest Reinsurance Company [Member] | AM Best, A+ Rating [Member] | Standard & Poor's, A+ Rating [Member] | Moody's, A1 Rating [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | 84,387 | 44,392
Florida Hurricane Catastrophe Fund [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total |  | 31,970
Odyssey Reinsurance Company [Member] | AM Best, A Rating [Member] | Standard & Poor's, A- Rating [Member] | Moody's, A3 Rating [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers total | $ 151,600 | $ 192,096

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Reinsurance unsecured amounts due from reinsurers. + References No definition available. + Details
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Namespace Prefix: | uve_
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