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Investments - Summary of Portion of Unrealized Gains and Losses Related to Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	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

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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

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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

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