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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalent investments with original maturities   3 months  
Statutory deposit held in cash and cash equivalent   $ 300,000us-gaap_AssetsHeldByInsuranceRegulators $ 300,000us-gaap_AssetsHeldByInsuranceRegulators
Percentage of investment in unconsolidated entities 90.00%us-gaap_VariableInterestEntityOwnershipPercentage    
ADC Arrangement   Under the ADC Arrangement, the Company provides financing to a property developer for the acquisition, development, and construction of a retail shopping center. The Company also expects to participate in the residual profit resulting from the ultimate sale or other use of the property. Classification and accounting for the ADC Arrangement as a loan, an investment in real estate, or a joint venture is determined by the Company’s evaluation of the characteristics and the risks and rewards of the ADC Arrangement. If the Company expects to receive more than 50% of the residual profit from the ADC Arrangement and it has characteristics similar to a real estate investment, the costs of the real estate project will be capitalized and interest will be recognized in net investment income.  
Period for establishing allowance on insurance premiums receivable   90 days  
Allowance on insurance premiums receivable   $ 0us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts $ 0us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts
Percentage of minimum tax benefit realized upon settlement   50.00%hci_PercentageOfIncomeTaxExaminationMinimumLikelihoodOfTaxBenefitsBeingRealizedUponSettlement  
Likelihood of tax realization upon settlement   50.00%hci_MinimumPercentageOfTaxPositionLikelihoodToBeRealizedOrSustainedUponExamination  
Investment in Joint Venture [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of investment in unconsolidated entities   90.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_MajorityOwnedSubsidiaryUnconsolidatedMember		  
Building [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of Property and Equipment   39 years  
Computer Hardware and Software [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of Property and Equipment   3 years  
Minimum [Member] | Office Furniture and Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of Property and Equipment   3 years  
Maximum [Member] | Office Furniture and Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of Property and Equipment   7 years