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Investments with Continuous Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value $ 398,982 $ 465,292
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (792) (4,010)
Investments with continuous unrealized losses for 12 months or greater, Fair value 12,547 42,231
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (5) (213)
Total Investments with continuous unrealized losses, Fair value 411,529 507,523
Total Investments with continuous unrealized losses, Unrealized losses (797) (4,223)
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 352,886 267,326
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (747) (2,225)
Investments with continuous unrealized losses for 12 months or greater, Fair value 6,046 27,490
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (4) (69)
Total Investments with continuous unrealized losses, Fair value 358,932 294,816
Total Investments with continuous unrealized losses, Unrealized losses (751) (2,294)
Government Sponsored Enterprises
    
Schedule of Available-for-sale Securities [Line Items]    
Investments with continuous unrealized losses for less than 12 months, Fair value 39,883 131,540
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (39) (151)
Investments with continuous unrealized losses for 12 months or greater, Fair value 252  
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses 0  
Total Investments with continuous unrealized losses, Fair value 40,135 131,540
Total Investments with continuous unrealized losses, Unrealized losses (39) (151)
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 6,213 66,426
Investments with continuous unrealized losses for less than 12 months, Unrealized losses (6) (1,634)
Investments with continuous unrealized losses for 12 months or greater, Fair value 6,249 14,741
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses (1) (144)
Total Investments with continuous unrealized losses, Fair value 12,462 81,167
Total Investments with continuous unrealized losses, Unrealized losses $ (7) $ (1,778)