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Reinsurance (Details Textual) (USD $) In Billions, unless otherwise specified	3 Months Ended
	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%

X

- Definition

In force policyholder coverage for windstorm exposures.

+ References

No definition available.

+ Details

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Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage 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

X

- Definition

Percentage reduction of premium ceded.

+ References

No definition available.

+ Details

Name:	uve_PercentageReductionOfPremiumCeded
Namespace Prefix:	uve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	uve_
Data Type:	xbrli:stringItemType
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