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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

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- Definition Available-for-sale Securities, Debt Maturities, within One Year, Gross Unrealized Gains. + References No definition available. + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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