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Marketable Securities with Contractual Maturities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year $ 1,082,520 $ 1,039,671
Gross unrealized gains up to one year 3,137 3,624
Gross unrealized losses up to one year (776) (146)
Fair value up to one year 1,084,881 1,043,149
Amortized cost, over one year through five years 2,339,591 2,372,736
Gross unrealized gains, over one year through five years 1,559 3,263
Gross unrealized losses, over one year through five years (9,963) (5,528)
Fair value, over one year through five years 2,331,187 2,370,471
Government And Corporate Debentures Fixed Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 994,600 882,051
Gross unrealized gains up to one year 3,088 3,433
Gross unrealized losses up to one year (752) (141)
Fair value up to one year 996,936 885,343
Amortized cost, over one year through five years 1,947,588 1,916,756
Gross unrealized gains, over one year through five years 1,439 2,905
Gross unrealized losses, over one year through five years (8,654) (4,519)
Fair value, over one year through five years 1,940,373 1,915,142
Government Sponsored Enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 46,230 154,619
Gross unrealized gains up to one year 25 183
Gross unrealized losses up to one year (17) (5)
Fair value up to one year 46,238 154,797
Amortized cost, over one year through five years 366,700 390,468
Gross unrealized gains, over one year through five years 109 256
Gross unrealized losses, over one year through five years (1,243) (990)
Fair value, over one year through five years 365,566 389,734
Government And Corporate Debentures Floating Interest Rate    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost up to one year 41,690 3,001
Gross unrealized gains up to one year 24 8
Gross unrealized losses up to one year (7)  
Fair value up to one year 41,707 3,009
Amortized cost, over one year through five years 25,303 65,512
Gross unrealized gains, over one year through five years 11 102
Gross unrealized losses, over one year through five years (66) (19)
Fair value, over one year through five years $ 25,248 $ 65,595