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Policyholder Account Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances $ 9,829,337us-gaap_PolicyholderContractDeposits  
Predecessor    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances   13,124,115us-gaap_PolicyholderContractDeposits
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Interest-sensitive life insurance    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances 5,008,094us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_InterestSensitiveLifeInsuranceMember
 
Interest-sensitive life insurance | Predecessor    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances   5,020,265us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_InterestSensitiveLifeInsuranceMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Equity indexed annuity contracts    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances 4,806,270us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_AnnuityContractsMember
 
Equity indexed annuity contracts | Predecessor    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances   7,803,892us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_AnnuityContractsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other investment contracts    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances 14,973us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_OtherInvestmentContractsMember
 
Other investment contracts | Predecessor    
Policyholder Contract Deposits By Product [Line Items]    
Total policyholders' account balances   $ 299,958us-gaap_PolicyholderContractDeposits
/ us-gaap_ProductOrServiceAxis
= ck0000910739_OtherInvestmentContractsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember