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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Document Period End Date Dec. 31, 2014  
Percentage of male contractholder 50.00%hrg_PercentageOfMaleContractHolder  
Percentage of female contractholder 50.00%hrg_PercentageOfFemaleContractHolder  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount  
Net transfer In (Out) of Level 3 (a) (5,900,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [1]  
Asset-backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net transfer In (Out) of Level 3 (a) (5,900,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[1] (5,900,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[1]
Fixed Maturities Available For Sale [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale Securities, Debt Securities 17,677,800,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
17,211,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available-for-sale Securities, Debt Securities $ 1,839,100,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
$ 1,792,900,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
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