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Fair Value - Additional Information (Detail) (Predecessor, USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Fair Value Disclosures [Line Items]        
Fair value reinsurement rate       100.00%ck0000910739_FairValueUnobservableInputReinstatementRate
Gains (losses) for Level 3 assets still held at the balance sheet date, included in interest credited to contract holder funds $ 17,600,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInterestCreditedToContractholderFunds $ 33,000,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInterestCreditedToContractholderFunds $ 125,900,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInterestCreditedToContractholderFunds  
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in life and annuity contract benefits 946,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInLifeAndAnnuityContractBenefits 10,200,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInLifeAndAnnuityContractBenefits 5,100,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInLifeAndAnnuityContractBenefits  
Quoted prices in active markets for identical assets (Level 1)
       
Fair Value Disclosures [Line Items]        
Fair value measurement of investment       15,000,000us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Carrying value
       
Fair Value Disclosures [Line Items]        
Contractholder funds on investment contracts   7,760,000,000ck0000910739_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Fair value
       
Fair Value Disclosures [Line Items]        
Contractholder funds on investment contracts   $ 7,660,000,000ck0000910739_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember