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Schedule of Fixed Maturities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities available for sale, Amortized Cost - Due in one year or less $ 106,965  
Fixed maturities available for sale, Amortized Cost - Due from one to five years 436,789  
Fixed maturities available for sale, Amortized Cost - Due from five to ten years 774,912  
Fixed maturities available for sale, Amortized Cost - Due from ten to twenty years 2,479,790  
Fixed maturities available for sale, Amortized Cost - Due after twenty years 7,019,092  
Mortgage-backed and asset-backed securities, Amortized Cost 111,681  
Total fixed maturities available for sale, Amortized Cost 10,929,229 10,924,244 [1]
Fixed maturities available for sale, Fair Value - Due in one year or less 110,397  
Fixed maturities available for sale, Fair Value - Due from one to five years 473,918  
Fixed maturities available for sale, Fair Value - Due from five to ten years 883,334  
Fixed maturities available for sale, Fair Value - Due from ten to twenty years 2,872,096  
Fixed maturities available for sale, Fair Value - Due after twenty years 8,074,506  
Mortgage-backed and asset-backed securities, Fair Value 89,125  
Total fixed maturities available for sale, Fair Value $ 12,503,376 $ 11,888,205 [1]
[1] Derived from audited financial statements. Additionally, 2011 balances have been retrospectively adjusted to give effect to the adoption of new accounting guidance as described in Note F-Adoption of New Accounting Standard.