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Investments - Summary of Fixed Maturities and Equity Securities Available for Sale by Component (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 13,251,871 $ 12,823,612
Fair Value 13,758,024 14,493,060 [1]
Equity Securities Cost or Amortized Cost 776 776
Equity securities available for sale 1,635 1,477 [1]
Total Available for Sale Securities Cost 13,252,647 12,824,388
Gross Unrealized Gains 1,070,592 1,748,771
Gross Unrealized Losses (563,580) (78,622)
Total fixed maturities and equity securities 13,759,659 14,494,537
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Equity Securities Cost or Amortized Cost 776 776
Gross Unrealized Gains 859 701
Gross Unrealized Losses 0 0
Equity securities available for sale 1,635 1,477
Fixed Maturities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 13,251,871 12,823,612
Gross Unrealized Gains 1,069,733 1,748,070
Gross Unrealized Losses (563,580) (78,622)
Fair Value $ 13,758,024 $ 14,493,060
Percentage of Total Fixed Maturities At Fair Value 100.00% 100.00%
Fixed Maturities [Member] | U.S. Government Direct, Guaranteed, and Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 368,718 $ 367,463
Gross Unrealized Gains 404 5,561
Gross Unrealized Losses (14,078) (3,183)
Fair Value $ 355,044 $ 369,841
Percentage of Total Fixed Maturities At Fair Value 3.00% 3.00%
Fixed Maturities [Member] | States, Municipalities, and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 1,296,396 $ 1,278,429
Gross Unrealized Gains 131,516 177,052
Gross Unrealized Losses (1,908) (718)
Fair Value $ 1,426,004 $ 1,454,763
Percentage of Total Fixed Maturities At Fair Value 10.00% 10.00%
Fixed Maturities [Member] | Foreign Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 21,594 $ 25,824
Gross Unrealized Gains 1,369 1,350
Gross Unrealized Losses (163) (1)
Fair Value $ 22,800 $ 27,173
Percentage of Total Fixed Maturities At Fair Value 0.00% 0.00%
Fixed Maturities [Member] | Corporates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 11,071,377 $ 10,565,620
Gross Unrealized Gains 872,961 1,501,212
Gross Unrealized Losses (533,160) (60,880)
Fair Value $ 11,411,178 $ 12,005,952
Percentage of Total Fixed Maturities At Fair Value 83.00% 83.00%
Fixed Maturities [Member] | Corporates [Member] | Financial [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 2,760,552 $ 2,659,266
Gross Unrealized Gains 301,624 419,303
Gross Unrealized Losses (54,881) (12,136)
Fair Value $ 3,007,295 $ 3,066,433
Percentage of Total Fixed Maturities At Fair Value 22.00% 21.00%
Fixed Maturities [Member] | Corporates [Member] | Utilities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 1,981,241 $ 2,154,433
Gross Unrealized Gains 223,535 377,962
Gross Unrealized Losses (28,267) (2,945)
Fair Value $ 2,176,509 $ 2,529,450
Percentage of Total Fixed Maturities At Fair Value 16.00% 17.00%
Fixed Maturities [Member] | Corporates [Member] | Energy [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 1,568,392 $ 1,511,839
Gross Unrealized Gains 53,776 173,485
Gross Unrealized Losses (219,101) (21,641)
Fair Value $ 1,403,067 $ 1,663,683
Percentage of Total Fixed Maturities At Fair Value 10.00% 12.00%
Fixed Maturities [Member] | Corporates [Member] | Other Corporate Sectors [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 4,761,192 $ 4,240,082
Gross Unrealized Gains 294,026 530,462
Gross Unrealized Losses (230,911) (24,158)
Fair Value $ 4,824,307 $ 4,746,386
Percentage of Total Fixed Maturities At Fair Value 35.00% 33.00%
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 63,662 $ 67,876
Gross Unrealized Gains 16,158 4,165
Gross Unrealized Losses (9,438) (8,809)
Fair Value $ 70,382 $ 63,232
Percentage of Total Fixed Maturities At Fair Value 1.00% 0.00%
Fixed Maturities [Member] | Other Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 18,963 $ 21,424
Gross Unrealized Gains 668 1,104
Gross Unrealized Losses 0 0
Fair Value $ 19,631 $ 22,528
Percentage of Total Fixed Maturities At Fair Value 0.00% 0.00%
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 411,161 $ 496,976
Gross Unrealized Gains 46,657 57,626
Gross Unrealized Losses (4,833) (5,031)
Fair Value $ 452,985 $ 549,571
Percentage of Total Fixed Maturities At Fair Value 3.00% 4.00%
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member] | Financial [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 382,517 $ 468,290
Gross Unrealized Gains 45,926 56,845
Gross Unrealized Losses (4,781) (5,008)
Fair Value $ 423,662 $ 520,127
Percentage of Total Fixed Maturities At Fair Value 3.00% 4.00%
Fixed Maturities [Member] | Redeemable Preferred Stocks [Member] | Utilities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 28,644 $ 28,686
Gross Unrealized Gains 731 781
Gross Unrealized Losses (52) (23)
Fair Value $ 29,323 $ 29,444
Percentage of Total Fixed Maturities At Fair Value 0.00% 0.00%
[1] Certain balances were adjusted to give effect to discontinued operations as described in Note 1—Significant Accounting Policies.