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Summary of Volume and Fair Value Position of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Contractholder funds | Equity-indexed annuity contracts  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional $ 1,734,264invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeFinancialInstrumentsEquityIndexedOptionsAnnuityContractsMember		 [1]
Gross Fair Value, Liabilities (63,660)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeFinancialInstrumentsEquityIndexedOptionsAnnuityContractsMember		 [1]
Contractholder funds | Equity-indexed life contracts  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 347,610invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeFinancialInstrumentsEquityIndexedOptionsInLifeProductContractsMember		 [1]
Gross Fair Value, Liabilities (18,720)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeFinancialInstrumentsEquityIndexedOptionsInLifeProductContractsMember		 [1]
Contractholder funds | Guaranteed accumulation benefits  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 120,714invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumAccumulationBenefitMember		 [2]
Gross Fair Value, Liabilities (6,367)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumAccumulationBenefitMember		 [2]
Contractholder funds | Guaranteed withdrawal benefits  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 17,102invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember		 [2]
Gross Fair Value, Liabilities (366)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember		 [2]
Equity Options  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 624invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
Gross Fair Value, Assets 68,776us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
Gross Fair Value, Liabilities (43,104)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
Future  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 10invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Gross Fair Value, Assets 329us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Predecessor | Contractholder funds | Guaranteed accumulation benefits  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 152,936invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumAccumulationBenefitMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
Gross Fair Value, Liabilities (8,970)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumAccumulationBenefitMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
Predecessor | Contractholder funds | Guaranteed withdrawal benefits  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 22,199invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
Gross Fair Value, Liabilities (474)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
Predecessor | Contractholder funds | Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional 2,591,090invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeEquityIndexedAndForwardStartingOptionsInLifeAndAnnuityProductContractMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
Gross Fair Value, Liabilities $ (258,415)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ContractHolderFundsMember
/ us-gaap_FinancialInstrumentAxis
= ck0000910739_EmbeddedDerivativeEquityIndexedAndForwardStartingOptionsInLifeAndAnnuityProductContractMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [3]
[1] Amount represents account value of equity indexed contracts
[2] As of April 1, 2014, these amounts were ceded in accordance with the Company's reinsurance agreements
[3] Prior to April 1, 2014, these amounts were ceded to ALIC or in accordance with the Company's reinsurance agreements.