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Schedule of Effects of Reinsurance on Interest Credited to Contractholder Funds, Contract Benefits and Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effects of Reinsurance [Line Items]        
Direct interest credited to contractholder funds, contract benefits and expenses $ 1,104,420ck0000910739_DirectLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses      
Assumed interest credited to contractholder funds, contract benefits and expenses 4,713ck0000910739_AssumedLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses      
Ceded interest credited to contractholder funds, contract benefits and expenses (635,887)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses      
Return credited to policyholders' account balances and policyholder benefits, net of reinsurance 473,246ck0000910739_InterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpensesNetOfReinsurance      
Predecessor        
Effects of Reinsurance [Line Items]        
Direct interest credited to contractholder funds, contract benefits and expenses   450,041ck0000910739_DirectLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,938,015ck0000910739_DirectLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,882,714ck0000910739_DirectLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Assumed interest credited to contractholder funds, contract benefits and expenses   2,606ck0000910739_AssumedLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
8,180ck0000910739_AssumedLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
9,167ck0000910739_AssumedLifeAndAnnuityInterestCreditedToContractholderFundsContractBenefitsAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Affiliates        
Effects of Reinsurance [Line Items]        
Ceded interest credited to contractholder funds, contract benefits and expenses   (336,122)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,505,010)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,369,305)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Non-affiliates        
Effects of Reinsurance [Line Items]        
Ceded interest credited to contractholder funds, contract benefits and expenses   $ (116,525)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= ck0000910739_NonAffiliatesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ (441,185)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= ck0000910739_NonAffiliatesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ (522,576)ck0000910739_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalancesContractBenefitsAndExpenses
/ dei_LegalEntityAxis
= ck0000910739_NonAffiliatesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember