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Investments with Continuous Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value $ 2,473,260 $ 1,394,934
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (10,352) (3,495)
Investments with continuous unrealized losses for 12 months or greater, Fair value 74,076 351,611
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (387) (2,179)
Total Investments with continuous unrealized losses, Fair value 2,547,336 1,746,545
Total Investments with continuous unrealized losses, Unrealized losses (10,739) (5,674)
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 2,138,546 1,199,879
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (9,027) (2,994)
Investments with continuous unrealized losses for 12 months or greater, Fair value 68,084 257,258
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (379) (1,666)
Total Investments with continuous unrealized losses, Fair value 2,206,630 1,457,137
Total Investments with continuous unrealized losses, Unrealized losses (9,406) (4,660)
Government Sponsored Enterprises Debentures    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 308,026 177,953
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (1,252) (487)
Investments with continuous unrealized losses for 12 months or greater, Fair value 5,992 89,350
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (8) (508)
Total Investments with continuous unrealized losses, Fair value 314,018 267,303
Total Investments with continuous unrealized losses, Unrealized losses (1,260) (995)
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 26,688 17,102
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (73) (14)
Investments with continuous unrealized losses for 12 months or greater, Fair value   5,003
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses   (5)
Total Investments with continuous unrealized losses, Fair value 26,688 22,105
Total Investments with continuous unrealized losses, Unrealized losses $ (73) $ (19)