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Other Invested Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Schedule of Investments [Line Items]  
Other invested assets $ 26,897us-gaap_OtherInvestments
Low Income Housing Tax Credit Properties  
Schedule of Investments [Line Items]  
Other invested assets 896us-gaap_OtherInvestments
/ us-gaap_OtherInvestmentNotReadilyMarketableAxis
= ck0000910739_LowIncomeHousingTaxCreditInvestmentProjectsMember
Derivative  
Schedule of Investments [Line Items]  
Other invested assets $ 26,001us-gaap_OtherInvestments
/ us-gaap_OtherInvestmentNotReadilyMarketableAxis
= us-gaap_DerivativeMember