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Reinsurance - Additional Information (Detail) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Oct. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Contractholder funds $ 17,160,100,000us-gaap_PolicyholderFunds $ 16,463,500,000us-gaap_PolicyholderFunds  
Ability Re [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     368,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves     $ 346,900,000hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember