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Schedule of Realized Investment Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2012
Investment Realized gains (losses)      
Net realized gains $ 46,092us-gaap_RealizedInvestmentGainsLosses    
Fixed income securities      
Investment Realized gains (losses)      
Net realized gains 25,795us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember		    
Commercial Mortgage Loans      
Investment Realized gains (losses)      
Net realized gains 2,880us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_CommercialMortgageLoansMember		    
Derivative      
Investment Realized gains (losses)      
Net realized gains 17,417us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeMember		    
Predecessor      
Investment Realized gains (losses)      
Net realized gains   285us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 626us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Fixed income securities      
Investment Realized gains (losses)      
Net realized gains   $ 285us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 626us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember