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Schedule of Contractholder Funds (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Policyholder Contract Deposits By Product [Line Items]      
Contractholder funds $ 14,255,844 $ 15,489,624 $ 17,247,071
Interest-sensitive life insurance
     
Policyholder Contract Deposits By Product [Line Items]      
Contractholder funds 4,814,410 4,556,892  
Fixed annuities
     
Policyholder Contract Deposits By Product [Line Items]      
Contractholder funds 9,201,641 10,709,817  
Other investment contracts
     
Policyholder Contract Deposits By Product [Line Items]      
Contractholder funds $ 239,793 $ 222,915