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Investment in Securities - Investments in Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost $ 8,394,157 $ 8,211,449
Bonds held-to-maturity securities, gross unrealized gains 285,854 72,403
Bonds held-to-maturity securities, gross unrealized (losses) (11,412) (153,768)
Fixed maturity securities, bonds held-to-maturity 8,668,599 8,130,084
Bonds available-for-sale securities, amortized cost 6,609,357 6,261,621
Bonds available-for-sale securities, gross unrealized gains 250,349 61,286
Bonds available-for-sale securities, gross unrealized (losses) (16,789) (107,344)
Bonds available-for-sale securities, fair value 6,842,917 6,215,563
Bonds investments in securities, cost or amortized cost 15,003,514 14,473,070
Bonds investments in securities, gross unrealized gains 536,203 133,689
Bonds investments in securities, gross unrealized (losses) (28,201) (261,112)
Bonds investments in securities, fair value 15,511,516 14,345,647
U.S. states and political subdivisions    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 207,563 245,360
Bonds held-to-maturity securities, gross unrealized gains 7,146 5,840
Bonds held-to-maturity securities, gross unrealized (losses) (52) (301)
Fixed maturity securities, bonds held-to-maturity 214,657 250,899
Bonds available-for-sale securities, amortized cost 1,063,172 848,228
Bonds available-for-sale securities, gross unrealized gains 42,859 16,827
Bonds available-for-sale securities, gross unrealized (losses) 0 (3,025)
Bonds available-for-sale securities, fair value 1,106,031 862,030
U.S. treasury and government    
Investment [Line Items]    
Bonds available-for-sale securities, amortized cost 28,300 28,304
Bonds available-for-sale securities, gross unrealized gains 489 338
Bonds available-for-sale securities, gross unrealized (losses) (44) (243)
Bonds available-for-sale securities, fair value 28,745 28,399
Foreign governments    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 3,934 3,961
Bonds held-to-maturity securities, gross unrealized gains 492 469
Bonds held-to-maturity securities, gross unrealized (losses) 0 0
Fixed maturity securities, bonds held-to-maturity 4,426 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
Bonds available-for-sale securities, fair value 6,361 6,210
Corporate debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 7,849,211 7,640,891
Bonds held-to-maturity securities, gross unrealized gains 267,162 58,772
Bonds held-to-maturity securities, gross unrealized (losses) (10,580) (150,834)
Fixed maturity securities, bonds held-to-maturity 8,105,793 7,548,829
Bonds available-for-sale securities, amortized cost 5,479,173 5,345,579
Bonds available-for-sale securities, gross unrealized gains 203,949 41,812
Bonds available-for-sale securities, gross unrealized (losses) (16,576) (103,573)
Bonds available-for-sale securities, fair value 5,666,546 5,283,818
Residential mortgage-backed securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 205,408 315,306
Bonds held-to-maturity securities, gross unrealized gains 8,109 7,237
Bonds held-to-maturity securities, gross unrealized (losses) (737) (2,633)
Fixed maturity securities, bonds held-to-maturity 212,780 319,910
Bonds available-for-sale securities, amortized cost 24,006 31,735
Bonds available-for-sale securities, gross unrealized gains 848 424
Bonds available-for-sale securities, gross unrealized (losses) (169) (497)
Bonds available-for-sale securities, fair value 24,685 31,662
Collateralized debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 127,892 5,214
Bonds held-to-maturity securities, gross unrealized gains 2,944 71
Bonds held-to-maturity securities, gross unrealized (losses) (43) 0
Fixed maturity securities, bonds held-to-maturity 130,793 5,285
Bonds available-for-sale securities, amortized cost 9,706 2,775
Bonds available-for-sale securities, gross unrealized gains 843 675
Bonds available-for-sale securities, gross unrealized (losses) 0 (6)
Bonds available-for-sale securities, fair value 10,549 3,444
Other debt securities    
Investment [Line Items]    
Bonds held-to-maturity securities, amortized cost 149 717
Bonds held-to-maturity securities, gross unrealized gains 1 14
Bonds held-to-maturity securities, gross unrealized (losses) 0 0
Fixed maturity securities, bonds held-to-maturity $ 150 $ 731