XML 55 R43.htm IDEA: XBRL DOCUMENT v3.7.0.1
Marketable Securities with Contractual Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year $ 1,078,521 $ 1,082,520
Gross unrealized gains up to one year 426 3,137
Gross unrealized losses up to one year (507) (776)
Fair value up to one year 1,078,440 1,084,881
Amortized cost, over one year through five years 2,308,920 2,339,591
Gross unrealized gains, over one year through five years 2,255 1,559
Gross unrealized losses, over one year through five years (15,078) (9,963)
Fair value, over one year through five years 2,296,097 2,331,187
Government And Corporate Debentures Fixed Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 915,302 994,600
Gross unrealized gains up to one year 311 3,088
Gross unrealized losses up to one year (446) (752)
Fair value up to one year 915,167 996,936
Amortized cost, over one year through five years 1,770,641 1,947,588
Gross unrealized gains, over one year through five years 1,903 1,439
Gross unrealized losses, over one year through five years (11,024) (8,654)
Fair value, over one year through five years 1,761,520 1,940,373
Government Sponsored Enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 149,972 46,230
Gross unrealized gains up to one year 99 25
Gross unrealized losses up to one year (61) (17)
Fair value up to one year 150,010 46,238
Amortized cost, over one year through five years 520,669 366,700
Gross unrealized gains, over one year through five years 282 109
Gross unrealized losses, over one year through five years (4,052) (1,243)
Fair value, over one year through five years 516,899 365,566
Government And Corporate Debentures Floating Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 13,247 41,690
Gross unrealized gains up to one year 16 24
Gross unrealized losses up to one year   (7)
Fair value up to one year 13,263 41,707
Amortized cost, over one year through five years 17,610 25,303
Gross unrealized gains, over one year through five years 70 11
Gross unrealized losses, over one year through five years (2) (66)
Fair value, over one year through five years $ 17,678 $ 25,248