Reinsurance Effects of Reinsurance on Premiums (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
Direct Premiums Written	$ 417,769us-gaap_DirectPremiumsWritten	$ 339,765us-gaap_DirectPremiumsWritten	$ 254,913us-gaap_DirectPremiumsWritten
Assumed Premiums Written	18,984us-gaap_AssumedPremiumsWritten	41,587us-gaap_AssumedPremiumsWritten	(4)us-gaap_AssumedPremiumsWritten
Ceded Premiums Written	(144,404)us-gaap_CededPremiumsWritten	(124,682)us-gaap_CededPremiumsWritten	(113,234)us-gaap_CededPremiumsWritten
Premiums Written, Net	292,349us-gaap_PremiumsWrittenNet	256,670us-gaap_PremiumsWrittenNet	141,675us-gaap_PremiumsWrittenNet
Increase (Decrease) in Direct Unearned Premiums	(38,995)	(44,422)	(28,743)
Increase (Decrease) in Assumed Unearned Premiums	2,937	(20,222)	88
Increase (Decrease) in Ceded Unearned Premiums	8,559	5,352	8,948
Increase (Decrease) in Unearned Premiums	(27,499)	(59,292)	(19,707)
Direct Premiums Earned, Property and Casualty	378,774us-gaap_DirectPremiumsEarned	295,343us-gaap_DirectPremiumsEarned	226,170us-gaap_DirectPremiumsEarned
Assumed Premiums Earned, Property and Casualty	21,921us-gaap_AssumedPremiumsEarned	21,365us-gaap_AssumedPremiumsEarned	84us-gaap_AssumedPremiumsEarned
Ceded Premiums Earned	(135,845)us-gaap_CededPremiumsEarned	(119,330)us-gaap_CededPremiumsEarned	(104,286)us-gaap_CededPremiumsEarned
Premiums Earned, Net	264,850us-gaap_PremiumsEarnedNet	197,378us-gaap_PremiumsEarnedNet	121,968us-gaap_PremiumsEarnedNet
Direct Losses and LAE Incurred	111,820uihc_DirectLossesAndLaeIncurred	92,526uihc_DirectLossesAndLaeIncurred	60,248uihc_DirectLossesAndLaeIncurred
Assumed Losses and LAE Incurred	8,672uihc_AssumedLossesAndLaeIncurred	9,240uihc_AssumedLossesAndLaeIncurred	(335)uihc_AssumedLossesAndLaeIncurred
Ceded Losses and LAE Incurred	(2,415)uihc_CededLossesAndLaeIncurred	(2,936)uihc_CededLossesAndLaeIncurred	(1,504)uihc_CededLossesAndLaeIncurred
Net Losses and LAE Incurred	$ 118,077uihc_NetLossesAndLaeIncurred	$ 98,830uihc_NetLossesAndLaeIncurred	$ 58,409uihc_NetLossesAndLaeIncurred

Assumed Losses and LAE Incurred

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Direct Losses and LAE Incurred

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Increase (Decrease) in Assumed Unearned Premiums

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Increase (Decrease) in Ceded Unearned Premiums

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Increase (Decrease) in Direct Unearned Premiums

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Net Losses and LAE Incurred

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reinsurance effect on unearned premiums

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Amount of earned premiums assumed from other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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