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Schedule of Future Policy Benefits and Other Policyholder Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits $ 6,463,964us-gaap_LiabilityForFuturePolicyBenefits  
Traditional life insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 1,492,438us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_TraditionalLifeInsuranceMember		  
Immediate fixed annuities    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 635,858us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_ImmediateAnnuitiesWithLifeContingenciesMember		  
Accident And Health Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 1,462,110us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_AccidentAndHealthInsuranceMember		  
Equity indexed annuity contracts    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 1,895,889us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_AnnuityContractsMember		  
Other Life Contingent Products    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 977,669us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_OtherLifeContingentProductsMember		  
Predecessor    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits   3,557,411us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Traditional life insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits   1,548,134us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_TraditionalLifeInsuranceMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Immediate fixed annuities    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits   676,565us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Accident And Health Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits   1,324,268us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_AccidentAndHealthInsuranceMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Other Life Contingent Products    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits   $ 8,444us-gaap_LiabilityForFuturePolicyBenefits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= ck0000910739_OtherLifeContingentProductsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember