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Schedule of Rollforward of Level Three Assets and Liabilities Held at Fair Value on Recurring Basis (Parenthetical) (Detail) (Predecessor, USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Predecessor
     
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Effect to net income included in interest credited to contract holder funds $ 17,600,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInInterestCreditedToContractholdersFunds
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 33,000,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInInterestCreditedToContractholdersFunds
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 125,900,000ck0000910739_FairValueAssetsMeasuredOnRecurringBasisGainLossIncludedInInterestCreditedToContractholdersFunds
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Effect to net income included in contract benefits $ 946,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInLifeAndAnnuityContractBenefits
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 10,200,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInLifeAndAnnuityContractBenefits
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 5,100,000ck0000910739_FairValueLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInLifeAndAnnuityContractBenefits
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember