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Schedule of Reserve for Life-Contingent Contract Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits $ 2,280,356us-gaap_LiabilityForFuturePolicyBenefits $ 2,151,316us-gaap_LiabilityForFuturePolicyBenefits
Structured settlement annuities    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 2,010,807us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_StructuredSettlementsLifeContingenciesAnnuitiesMember		 1,903,194us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_StructuredSettlementsLifeContingenciesAnnuitiesMember
Other immediate fixed annuities    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 54,834us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_OtherImmediateFixedAnnuitiesMember		 43,775us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_OtherImmediateFixedAnnuitiesMember
Traditional life insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 201,661us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_TraditionalLifeInsuranceMember		 192,114us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_TraditionalLifeInsuranceMember
Accident and health insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 11,209us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_AccidentAndHealthInsuranceMember		 10,396us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_AccidentAndHealthInsuranceMember
Other    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits $ 1,845us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_OtherLifeContingentProductsMember		 $ 1,837us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_OtherLifeContingentProductsMember