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Schedule of Change in Unrealized Gains and Losses Included in Net Income for Level Three Assets and Liabilities Held (Detail) (Predecessor, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs Gain Loss [Line Items]      
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings $ 18,525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings [1] $ 43,244us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings [2] $ 131,054us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings [3]
Derivatives embedded in life and annuity contracts
      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs Gain Loss [Line Items]      
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings $ 18,525us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_DerivativesEmbeddedInAnnuityContractsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 43,244us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_DerivativesEmbeddedInAnnuityContractsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 131,054us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_DerivativesEmbeddedInAnnuityContractsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
[1] The amount attributable to derivatives embedded in life and annuity contracts was reported as follows: $17.6 million in interest credited to contractholder funds and $946 thousand in contract benefits. These amounts were ceded in accordance with the Company's reinsurance agreements.
[2] The amount attributable to derivatives embedded in life and annuity contracts was reported as follows: $33.0 million in interest credited to contractholder funds and $10.2 million in contract benefits. These amounts were ceded in accordance with the Company's reinsurance agreements.
[3] The amount attributable to derivatives embedded in life and annuity contracts was reported as follows: $125.9 million in interest credited to contractholder funds and $5.1 million in contract benefits. These amounts were ceded in accordance with the Company's reinsurance agreements.