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Investments - Narrative (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Schedule of Cost-method Investments [Line Items]  
Available-for-sale Securities $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Kayne Senior Credit Fund II, L.P. [Member]  
Schedule of Cost-method Investments [Line Items]  
Fair Value of Limited Partnership Interest 739,000uihc_FairValueOfLimitedPartnershipInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= uihc_KayneSeniorCreditFundIIL.P.Member
Payments to Acquire Other Investments 1,261,000us-gaap_PaymentsToAcquireOtherInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= uihc_KayneSeniorCreditFundIIL.P.Member
Limited Partner [Member]  
Schedule of Cost-method Investments [Line Items]  
Available-for-sale Securities 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_InvestmentTypeAxis
= us-gaap_LimitedPartnerMember
Fair Value of Limited Partnership Interest $ 2,743,000uihc_FairValueOfLimitedPartnershipInterest
/ us-gaap_InvestmentTypeAxis
= us-gaap_LimitedPartnerMember