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Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Number of investment funds 3fac_NumberOfInvestmentFundsInLimitedPartnership  
Unfunded commitments $ 1.9fac_UnfundedCommitment  
Fixed maturities and cash equivalents on deposit with various insurance departments at fair value and amortized cost 6.4fac_FixedMaturitiesAndCashEquivalentsOnDepositWithVariousInsuranceDepartmentsAtFairValueAndAmortizedCost  
Cash equivalents on deposit with another insurance company at fair value and amortized cost 9.4fac_CashEquivalentsOnDepositWithAnotherInsuranceCompanyAtFairValueAndAmortizedCost  
Collateralized mortgage obligations: Non-agency backed - residential    
Schedule of Available-for-sale Securities [Line Items]    
Non credit other than temporary impairment for securities 0.9fac_NonCreditOtherThanTemporaryImpairmentForSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 0.9fac_NonCreditOtherThanTemporaryImpairmentForSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Collateralized mortgage obligations: Non-agency backed - commercial    
Schedule of Available-for-sale Securities [Line Items]    
Non credit other than temporary impairment for securities $ 0.2fac_NonCreditOtherThanTemporaryImpairmentForSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 $ 0.2fac_NonCreditOtherThanTemporaryImpairmentForSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember