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Quarterly Results for 2014 and 2013 - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Condensed Income Statements Captions [Line Items]
Increase in revenue during period	$ 26.9uve_IncreaseInRevenueDuringPeriod
Increase in operating expenses	$ 16.0uve_IncreaseDecreaseInOperatingExpenses
Maximum [Member]
Condensed Income Statements Captions [Line Items]
Percentage of quota-share cession rate		45.00%uve_PercentageOfQuotaShareCessionRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum
Condensed Income Statements Captions [Line Items]
Percentage of quota-share cession rate		30.00%uve_PercentageOfQuotaShareCessionRate / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition

Increase decrease in operating expenses.

+ References

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- Definition

Increase in revenue during period.

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- Definition

Percentage of quota share cession rate.

+ References

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