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Investments with Continuous Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value $ 2,184,292 $ 2,473,260
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (15,554) (10,352)
Investments with continuous unrealized losses for 12 months or greater, Fair value 45,464 74,076
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (31) (387)
Total Investments with continuous unrealized losses, Fair value 2,229,756 2,547,336
Total Investments with continuous unrealized losses, Unrealized losses (15,585) (10,739)
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 1,717,212 2,138,546
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (11,440) (9,027)
Investments with continuous unrealized losses for 12 months or greater, Fair value 40,465 68,084
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (30) (379)
Total Investments with continuous unrealized losses, Fair value 1,757,677 2,206,630
Total Investments with continuous unrealized losses, Unrealized losses (11,470) (9,406)
Government Sponsored Enterprises Debentures    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 464,080 308,026
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (4,112) (1,252)
Investments with continuous unrealized losses for 12 months or greater, Fair value 4,999 5,992
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (1) (8)
Total Investments with continuous unrealized losses, Fair value 469,079 314,018
Total Investments with continuous unrealized losses, Unrealized losses (4,113) (1,260)
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 3,000 26,688
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (2) (73)
Total Investments with continuous unrealized losses, Fair value 3,000 26,688
Total Investments with continuous unrealized losses, Unrealized losses $ (2) $ (73)