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Investment in Securities - Investments in Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost $ 8,715,569 $ 8,211,449
Bonds held-to-maturity securities, gross unrealized gains 355,009 72,403
Bonds held-to-maturity securities, gross unrealized (losses) (6,890) (153,768)
Fixed maturity securities, bonds held-to-maturity 9,063,688 8,130,084
Bonds available-for-sale securities, amortized cost 6,545,358 6,261,621
Bonds available-for-sale securities, gross unrealized gains 301,024 61,286
Bonds available-for-sale securities, gross unrealized (losses) (20,137) (107,344)
Cost of equity securities 6,826,245 6,215,563
Bonds investments in securities, cost or amortized cost 15,260,927 14,473,070
Bonds investments in securities, gross unrealized gains 656,033 133,689
Bonds investments in securities, gross unrealized (losses) (27,027) (261,112)
Bonds investments in securities, fair value 15,889,933 14,345,647
U.S. states and political subdivisions    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 203,858 245,360
Bonds held-to-maturity securities, gross unrealized gains 6,969 5,840
Bonds held-to-maturity securities, gross unrealized (losses) 0 (301)
Fixed maturity securities, bonds held-to-maturity 210,827 250,899
Bonds available-for-sale securities, amortized cost 1,053,360 848,228
Bonds available-for-sale securities, gross unrealized gains 52,394 16,827
Bonds available-for-sale securities, gross unrealized (losses) (9) (3,025)
Cost of equity securities 1,105,745 862,030
U.S. treasury and government    
Investment [Line Items]    
Bonds available-for-sale securities, amortized cost 29,510 28,304
Bonds available-for-sale securities, gross unrealized gains 477 338
Bonds available-for-sale securities, gross unrealized (losses) (26) (243)
Cost of equity securities 29,961 28,399
Foreign governments    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 3,921 3,961
Bonds held-to-maturity securities, gross unrealized gains 469 469
Bonds held-to-maturity securities, gross unrealized (losses) 0 0
Fixed maturity securities, bonds held-to-maturity 4,390 4,430
Bonds available-for-sale securities, amortized cost 5,000 5,000
Bonds available-for-sale securities, gross unrealized gains 1,361 1,210
Bonds available-for-sale securities, gross unrealized (losses) 0 0
Cost of equity securities 6,361 6,210
Corporate debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 8,152,982 7,640,891
Bonds held-to-maturity securities, gross unrealized gains 336,960 58,772
Bonds held-to-maturity securities, gross unrealized (losses) (5,998) (150,834)
Fixed maturity securities, bonds held-to-maturity 8,483,944 7,548,829
Bonds available-for-sale securities, amortized cost 5,424,250 5,345,579
Bonds available-for-sale securities, gross unrealized gains 245,034 41,812
Bonds available-for-sale securities, gross unrealized (losses) (19,934) (103,573)
Cost of equity securities 5,649,350 5,283,818
Residential mortgage-backed securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 208,752 315,306
Bonds held-to-maturity securities, gross unrealized gains 7,885 7,237
Bonds held-to-maturity securities, gross unrealized (losses) (629) (2,633)
Fixed maturity securities, bonds held-to-maturity 216,008 319,910
Bonds available-for-sale securities, amortized cost 23,699 31,735
Bonds available-for-sale securities, gross unrealized gains 933 424
Bonds available-for-sale securities, gross unrealized (losses) (168) (497)
Cost of equity securities 24,464 31,662
Collateralized debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 146,056 5,214
Bonds held-to-maturity securities, gross unrealized gains 2,726 71
Bonds held-to-maturity securities, gross unrealized (losses) (263) 0
Fixed maturity securities, bonds held-to-maturity 148,519 5,285
Bonds available-for-sale securities, amortized cost 9,539 2,775
Bonds available-for-sale securities, gross unrealized gains 825 675
Bonds available-for-sale securities, gross unrealized (losses) 0 (6)
Cost of equity securities $ 10,364 3,444
Other debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost   717
Bonds held-to-maturity securities, gross unrealized gains   14
Bonds held-to-maturity securities, gross unrealized (losses)   0
Fixed maturity securities, bonds held-to-maturity   $ 731