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Schedule Of Fixed Maturities By Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 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 $ 76,832  
Fixed maturities available for sale, Amortized Cost - Due from one to five years 465,380  
Fixed maturities available for sale, Amortized Cost - Due from five to ten years 708,106  
Fixed maturities available for sale, Amortized Cost - Due from ten to twenty years 2,504,770  
Fixed maturities available for sale, Amortized Cost - Due after twenty years 7,215,861  
Mortgage-backed and asset-backed securities, Amortized Cost 104,137  
Total fixed maturities available for sale, Amortized Cost 11,075,086 10,924,244 [1]
Fixed maturities available for sale, Fair Value - Due in one year or less 79,363  
Fixed maturities available for sale, Fair Value - Due from one to five years 500,769  
Fixed maturities available for sale, Fair Value - Due from five to ten years 792,598  
Fixed maturities available for sale, Fair Value - Due from ten to twenty years 2,800,162  
Fixed maturities available for sale, Fair Value - Due after twenty years 8,062,238  
Mortgage-backed and asset-backed securities, Fair Value 73,554  
Total fixed maturities available for sale, Fair Value $ 12,308,684 $ 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.