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Policyholder Account Balances - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Minimum  
Interest crediting rates range for sensitive contracts 0.40%ck0000910739_CreditRateInterestSensitiveLifeInsurance
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Interest crediting rates for individual annuities 0.00%ck0000910739_CreditRateInterestIndividualAnnuities
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Interest crediting rates range for sensitive contracts 6.00%ck0000910739_CreditRateInterestSensitiveLifeInsurance
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Interest crediting rates for individual annuities 6.00%ck0000910739_CreditRateInterestIndividualAnnuities
/ us-gaap_RangeAxis
= us-gaap_MaximumMember