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Related Party Transactions - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related Party Transaction [Line Items]                
Operating expenses, including compensation, allocated by Allstate Insurance Company $ 44,100,000us-gaap_CostsAndExpensesRelatedParty $ 54,200,000us-gaap_CostsAndExpensesRelatedParty $ 51,400,000us-gaap_CostsAndExpensesRelatedParty          
Premium revenue 59,070,000us-gaap_PremiumsEarnedNet 55,789,000us-gaap_PremiumsEarnedNet 38,037,000us-gaap_PremiumsEarnedNet          
Reserve for annuities issued 2,280,356,000us-gaap_LiabilityForFuturePolicyBenefits 2,151,316,000us-gaap_LiabilityForFuturePolicyBenefits            
Ceded premium related to structured settlement annuities 12,782,000us-gaap_CededPremiumsEarned 15,510,000us-gaap_CededPremiumsEarned 32,920,000us-gaap_CededPremiumsEarned          
Carrying value of structured settlement reinsurance treaty 493,800,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 514,500,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral            
Maximum amount of loans Corporation will have outstanding to all eligible subsidiaries at any given point in time 1,000,000,000ck0000839759_RelatedPartyTransactionMaximumLimitOfBorrowings              
Net investment income from notes receivables 332,594,000us-gaap_InterestAndDividendIncomeOperating 337,496,000us-gaap_InterestAndDividendIncomeOperating 358,811,000us-gaap_InterestAndDividendIncomeOperating          
Allstate Insurance Company ("AIC")                
Related Party Transaction [Line Items]                
Reserve for annuities issued 2,060,000,000us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateInsuranceCompanyMember		 2,080,000,000us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateInsuranceCompanyMember		            
Allstate Insurance Company ("AIC") | Life contingent structured settlement                
Related Party Transaction [Line Items]                
Structured settlement annuities issued   900,000ck0000839759_AnnuitiesIssued
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_LifeContingentStructuredSettlementFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateInsuranceCompanyMember		 5,900,000ck0000839759_AnnuitiesIssued
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_LifeContingentStructuredSettlementFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateInsuranceCompanyMember		          
Premium revenue     89,000us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000839759_LifeContingentStructuredSettlementFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateInsuranceCompanyMember		          
Allstate Distributors Services, LLC                
Related Party Transaction [Line Items]                
Broker-Dealer agreement, Promotion and marketing expense 7,000us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateDistributorsServicesLlcMember		 14,000us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateDistributorsServicesLlcMember		 27,000us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateDistributorsServicesLlcMember		          
Allstate Financial Services, LLC                
Related Party Transaction [Line Items]                
Broker-Dealer agreement, Commission and other distribution expenses 166,000us-gaap_SalesCommissionsAndFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateFinancialServicesLlcMember		 246,000us-gaap_SalesCommissionsAndFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateFinancialServicesLlcMember		 316,000us-gaap_SalesCommissionsAndFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateFinancialServicesLlcMember		          
Allstate Life Insurance Company                
Related Party Transaction [Line Items]                
Ceded premium related to structured settlement annuities 3,400,000us-gaap_CededPremiumsEarned
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateLifeInsuranceCompanyMember		 3,500,000us-gaap_CededPremiumsEarned
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateLifeInsuranceCompanyMember		 3,500,000us-gaap_CededPremiumsEarned
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateLifeInsuranceCompanyMember		          
Carrying value of structured settlement reinsurance treaty 84,600,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateLifeInsuranceCompanyMember		 27,800,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_AllstateLifeInsuranceCompanyMember		            
Road Bay Investments , LLC ("RBI")                
Related Party Transaction [Line Items]                
Maximum amount of mortgage loans to be sold to related party               50,000,000ck0000839759_RelatedPartyTransactionAssetPurchaseAgreementMaximumAggregateFairValueAllowedToPurchaseOrParticipateInMortgageLoans
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember
Note receivable related to mortgage loan sold 0us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 0us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		   2,800,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 13,700,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		      
Mortgage loans fair value on date of sale       2,800,000us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 13,700,000us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		      
Related party transaction, interest rate       5.80%us-gaap_RelatedPartyTransactionRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 7.00%us-gaap_RelatedPartyTransactionRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		      
Related party transaction ,note due date       Mar. 09, 2018 Mar. 26, 2017      
Proceed from note receivable     2,800,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		     1,100,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 9,800,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		  
Net investment income from notes receivables   $ 65,000us-gaap_InterestAndDividendIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember		 $ 220,000us-gaap_InterestAndDividendIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0000839759_RoadBayInvestmentsLlcMember