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Schedule of Fixed Maturities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 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 $ 113,013  
Fixed maturities available for sale, Amortized Cost - Due from one to five years 436,514  
Fixed maturities available for sale, Amortized Cost - Due from five to ten years 876,057  
Fixed maturities available for sale, Amortized Cost - Due from ten to twenty years 2,742,186  
Fixed maturities available for sale, Amortized Cost - Due after twenty years 7,683,337  
Mortgage-backed and asset-backed securities, Amortized Cost 112,299  
Total fixed maturities available for sale, Amortized Cost 11,963,406 10,924,244
Fixed maturities available for sale, Fair Value - Due in one year or less 116,074  
Fixed maturities available for sale, Fair Value - Due from one to five years 473,976  
Fixed maturities available for sale, Fair Value - Due from five to ten years 991,262  
Fixed maturities available for sale, Fair Value - Due from ten to twenty years 3,163,562  
Fixed maturities available for sale, Fair Value - Due after twenty years 8,698,281  
Mortgage-backed and asset-backed securities, Fair Value 98,038  
Debt Securities Fair Value $ 13,541,193 $ 11,888,205