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Schedule of Reserve for Life-Contingent Contract Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits $ 3,557,411 $ 3,424,679
Traditional life insurance
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 1,548,134 1,519,650
Immediate fixed annuities
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 676,565 677,986
Accident And Health Insurance
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits 1,324,268 1,217,648
Other Life Contingent Products
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Reserve for life-contingent contract benefits $ 8,444 $ 9,395