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Investments with Continuous Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value $ 962,999 $ 1,911,338
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (5,366) (8,636)
Investments with continuous unrealized losses for 12 months or greater, Fair value 2,287,106 1,358,676
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (27,498) (13,266)
Total Investments with continuous unrealized losses, Fair Value 325,006 3,270,014
Total Investments with continuous unrealized losses, Unrealized losses (32,864) (21,902)
Government And Corporate Debentures Fixed Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 807,274 1,647,125
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (4,369) (7,318)
Investments with continuous unrealized losses for 12 months or greater, Fair value 1,852,625 1,063,690
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (22,278) (9,585)
Total Investments with continuous unrealized losses, Fair Value 2,659,899 2,710,815
Total Investments with continuous unrealized losses, Unrealized losses (26,647) (16,903)
Government Sponsored Enterprises Debentures    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 40,213 236,403
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (79) (1,281)
Investments with continuous unrealized losses for 12 months or greater, Fair value 429,101 294,986
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (5,213) (3,681)
Total Investments with continuous unrealized losses, Fair Value 469,315 531,389
Total Investments with continuous unrealized losses, Unrealized losses (5,292) (4,962)
Government And Corporate Debentures Floating Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 115,511 27,810
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (917) (37)
Investments with continuous unrealized losses for 12 months or greater, Fair value 5,380  
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (7)  
Total Investments with continuous unrealized losses, Fair Value 120,892 27,810
Total Investments with continuous unrealized losses, Unrealized losses $ (925) $ (37)