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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 6 Months Ended
Dec. 31, 2014
State
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Indefinite-lived Intangible Assets [Line Items]        
Number of states in which company writes non-standard personal automobile insurance 12fac_NumberOfStatesInWhichCompanyWritesNonStandardPersonalAutomobileInsurance      
Number of states in which company is licensed as an insurer 13fac_NumberOfAdditionalStatesInWhichCompanyLicensedAsInsurer      
Original maturities period of highly liquid investments 3 months      
Foreclosed real estate held for sale assets $ 0.8us-gaap_RealEstateHeldforsale $ 0.8us-gaap_RealEstateHeldforsale    
Amortization expenses 11.4us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts 11.1us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts 11.4us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts  
Income taxes 0.7us-gaap_IncomeTaxesPaid 0.5us-gaap_IncomeTaxesPaid 0.2us-gaap_IncomeTaxesPaid  
Interest expense 1.7us-gaap_InterestPaid 1.7us-gaap_InterestPaid 3.0us-gaap_InterestPaid  
ASU 2010-26 [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Additional amortization expense on deferred acquisition costs       $ 0.4us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AccountingStandardsUpdate201026Member
Minimum [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Estimated useful lives of the assets 3 years      
Maximum [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Estimated useful lives of the assets 7 years