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Investments - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]        
Commercial Mortgage Loan $ 1,138,880,000ck0000910739_CommercialMortgageLoan      
Other-than-temporary impairment losses included in accumulated other comprehensive income 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities      
Commercial Mortgage Loans        
Schedule of Investments [Line Items]        
Allowance for credit losses 0us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ck0000910739_CommercialMortgageLoansMember
     
Impaired loans 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ck0000910739_CommercialMortgageLoansMember
     
Commitments to fund borrowers troubled debt restructuring 0us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ck0000910739_CommercialMortgageLoansMember
     
Residential mortgage-backed securities ("RMBS")        
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
     
Predecessor | Residential mortgage-backed securities ("RMBS")        
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
19,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other-than-temporary impairment losses included in accumulated other comprehensive income     $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember