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Reinsurance (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2005
Dec. 31, 2014
item
Dec. 31, 2013
Reinsurance recoverables      
Reinsurance recoverables   2,154,208us-gaap_ReinsuranceRecoverables $ 1,837,380us-gaap_ReinsuranceRecoverables
Forethought Life Insurance Company      
Reinsurance recoverables      
Period of time entity obligated to discontinue writing new preneed insurance policies 10 years    
FFG division | The Hartford      
Reinsurance recoverables      
Reinsurance recoverables   575,625us-gaap_ReinsuranceRecoverables
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usic_FFGDivisionMember
/ dei_LegalEntityAxis
= usic_HartfordMember		 585,108us-gaap_ReinsuranceRecoverables
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usic_FFGDivisionMember
/ dei_LegalEntityAxis
= usic_HartfordMember
FFG division | The Hartford | Minimum      
Reinsurance recoverables      
Number of reinsurer insolvency for making company responsible for administering reinsurance business   1usic_ReinsuranceAgreementNumberOfReinsurerInsolvency
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usic_FFGDivisionMember
/ dei_LegalEntityAxis
= usic_HartfordMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
LTC Operations | John Hancock      
Reinsurance recoverables      
Reinsurance recoverables   1,469,893us-gaap_ReinsuranceRecoverables
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usic_LTCOperationsMember
/ dei_LegalEntityAxis
= usic_JohnHancockMember		 $ 1,143,731us-gaap_ReinsuranceRecoverables
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= usic_LTCOperationsMember
/ dei_LegalEntityAxis
= usic_JohnHancockMember