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Schedule for Fixed Income Securities at Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,231,856us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Gross Unrealized Gains 198,440us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax  
Gross Unrealized Losses (39,649)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax  
Fair Value 9,390,647us-gaap_AvailableForSaleSecuritiesDebtSecurities  
U.S. Treasury Securities and Obligations of U.S. Government Authority and Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 810,057us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UsTreasuryAndAgencyObligationMember
 
Gross Unrealized Gains 47,859us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UsTreasuryAndAgencyObligationMember
 
Gross Unrealized Losses (590)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UsTreasuryAndAgencyObligationMember
 
Fair Value 857,326us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UsTreasuryAndAgencyObligationMember
 
Obligations of U.S. States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 250,008us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UnitedStatesAndSovereignGovernmentObligationsMember
 
Gross Unrealized Gains 5,638us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UnitedStatesAndSovereignGovernmentObligationsMember
 
Gross Unrealized Losses (437)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UnitedStatesAndSovereignGovernmentObligationsMember
 
Fair Value 255,209us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ck0000910739_UnitedStatesAndSovereignGovernmentObligationsMember
 
All other corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,279,391us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Gross Unrealized Gains 132,480us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Gross Unrealized Losses (34,126)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Fair Value 7,377,745us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Asset-backed securities ("ABS")    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 373,304us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Gross Unrealized Gains 6,107us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Gross Unrealized Losses (2,408)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fair Value 377,003us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Commercial mortgage-backed securities ("CMBS")    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 331,041us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Gross Unrealized Gains 3,507us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Gross Unrealized Losses (1,065)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Fair Value 333,483us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Residential mortgage-backed securities ("RMBS")    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 188,055us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Gross Unrealized Gains 2,849us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Gross Unrealized Losses (1,023)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Fair Value 189,881us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Predecessor    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   284,928us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   10,004us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Losses   (4,050)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   290,882us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | All other corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   190,186us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   5,784us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Losses   (3,993)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   191,977us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Commercial mortgage-backed securities ("CMBS")    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   2,588us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   88us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   2,676us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Residential mortgage-backed securities ("RMBS")    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   13,866us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   584us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   14,450us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | United States Government, Government Agencies and Authorities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   70,790us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   3,113us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Losses   (57)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   73,846us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Municipal    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   2,499us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   270us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   2,769us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   4,999us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Gross Unrealized Gains   165us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Fair Value   $ 5,164us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember