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Investments - Effect of Trading Activities by Type of Instrument and by Line Item in Condensed Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Net Investment Income [Line Items] |
Total realized gains (losses) on trading portfolio | $ (16,037)
Total change in unrealized gains (losses) on trading portfolio | 7,874
Net gains (losses) recognized on trading portfolio | (8,163)
Equity Securities [Member] |
Net Investment Income [Line Items] |
Total realized gains (losses) on trading portfolio | (15,969)
Total change in unrealized gains (losses) on trading portfolio | 7,758
Derivatives (Non-Hedging Instruments) [Member] |
Net Investment Income [Line Items] |
Total realized gains (losses) on trading portfolio | (68)
Total change in unrealized gains (losses) on trading portfolio | 89
Fixed Maturities [Member] |
Net Investment Income [Line Items] |
Total change in unrealized gains (losses) on trading portfolio | 13
Other Investments [Member] |
Net Investment Income [Line Items] |
Total change in unrealized gains (losses) on trading portfolio | $ 14

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- Definition The sum of the realized and unrealized net gain (loss) on trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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Period Type: | duration

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- Details
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- Definition Marketable securities, realized gain (loss) trading portfolio. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
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- Definition Marketable securities, unrealized gain (loss) trading portfolio. + References No definition available. + Details
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Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
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