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Summary of Fixed Maturities and Equity Securities Available for Sale by Component (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost $ 11,963,406 $ 10,924,244
Equity Securities Cost or Amortized Cost 14,875 14,875
Total Available for Sale Cost 11,978,281 10,939,119
Gross Unrealized Gains 1,667,520 1,205,376
Gross Unrealized Losses (89,041) (239,234)
Debt Securities Fair Value 13,541,193 11,888,205
Total Available for Sale Fair Value 13,556,760 11,905,261
Equity Securities Amount per the Balance Sheet 15,567 17,056
Total Available for Sale Amount per the Balance Sheet 13,556,760 11,905,261
Equity Securities
   
Schedule of Available-for-sale Securities [Line Items]    
Equity Securities Cost or Amortized Cost 14,875 14,875
Gross Unrealized Gains 692 2,244
Gross Unrealized Losses 0 (63)
Equity Securities Fair Value 15,567 17,056
Equity Securities Amount per the Balance Sheet 15,567 17,056
Fixed Maturities
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 11,963,406 10,924,244
Gross Unrealized Gains 1,666,828 1,203,132
Gross Unrealized Losses (89,041) (239,171)
Debt Securities Fair Value 13,541,193 11,888,205
Debt Securities Amount per the Balance Sheet 13,541,193 11,888,205
% of Total Fixed Maturities 100.00% [1] 100.00% [1]
Fixed Maturities | U.S. Government Direct, Guaranteed, And Government-Sponsored Enterprises
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 492,928 65,283
Gross Unrealized Gains 1,948 1,756
Gross Unrealized Losses (4,773) (4)
Debt Securities Fair Value 490,103 67,035
Debt Securities Amount per the Balance Sheet 490,103 67,035
% of Total Fixed Maturities 4.00% [1] 1.00% [1]
Fixed Maturities | States, Municipalities, And Political Subdivisions
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 1,283,883 1,213,082
Gross Unrealized Gains 173,649 118,636
Gross Unrealized Losses (189) (1,896)
Debt Securities Fair Value 1,457,343 1,329,822
Debt Securities Amount per the Balance Sheet 1,457,343 1,329,822
% of Total Fixed Maturities 11.00% [1] 11.00% [1]
Fixed Maturities | Foreign Governments
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 33,577 21,832
Gross Unrealized Gains 988 1,327
Gross Unrealized Losses 0 0
Debt Securities Fair Value 34,565 23,159
Debt Securities Amount per the Balance Sheet 34,565 23,159
% of Total Fixed Maturities 0.00% [1] 0.00% [1]
Fixed Maturities | Corporates
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 9,309,408 8,357,809
Gross Unrealized Gains 1,442,638 1,051,019
Gross Unrealized Losses (55,023) (137,908)
Debt Securities Fair Value 10,697,023 9,270,920
Debt Securities Amount per the Balance Sheet 10,697,023 9,270,920
% of Total Fixed Maturities 79.00% [1] 78.00% [1]
Fixed Maturities | Collateralized Debt Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 64,622 60,437
Gross Unrealized Gains 0 0
Gross Unrealized Losses (18,051) (30,117)
Debt Securities Fair Value 46,571 30,320
Debt Securities Amount per the Balance Sheet 46,571 30,320
% of Total Fixed Maturities 0.00% [1] 0.00% [1]
Fixed Maturities | Other Asset-Backed Securities
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 43,560 42,862
Gross Unrealized Gains 3,708 3,210
Gross Unrealized Losses (401) (1,392)
Debt Securities Fair Value 46,867 44,680
Debt Securities Amount per the Balance Sheet 46,867 44,680
% of Total Fixed Maturities 0.00% [1] 0.00% [1]
Fixed Maturities | Redeemable Preferred Stocks
   
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Cost or Amortized Cost 735,428 1,162,939
Gross Unrealized Gains 43,897 27,184
Gross Unrealized Losses (10,604) (67,854)
Debt Securities Fair Value 768,721 1,122,269
Debt Securities Amount per the Balance Sheet $ 768,721 $ 1,122,269
% of Total Fixed Maturities 6.00% [1] 10.00% [1]
[1] At fair value