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Investments - Summary of Portion of Unrealized Gains and Losses Related to Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Investments Equity Securities [Abstract] |  |
Net gains and (losses) recognized during the period on equity securities | $ (4,985) | $ (27)
Less: Net (gains) and losses recognized during the period on equity securities sold during the period | (124) | $ 27
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting period | $ (5,109) |

X
- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | uve_EquitySecuritiesFvNiRealizedGainLoss
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | uve_EquitySecuritiesFvNiUnrealizedGainLoss
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | uve_EquitySecuritiesFvNiUnrealizedLoss
Namespace Prefix: | uve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Investments equity securities. + References No definition available. + Details
Name: | uve_InvestmentsEquitySecuritiesAbstract
Namespace Prefix: | uve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration