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Contractual Maturities of Investments Held (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Schedule of Available-for-sale Securities |
Due within one year, cost | $ 1,349,970
Due after 1 year through 5 years, cost | 48,796
Due after 5 years through 10 years, cost | 13,916
Due after 10 years, cost | 38,644
Total, cost | 1,451,326
Due within one year, fair value | 1,347,979
Due after 1 year through 5 years, fair value | 48,599
Due after 5 years through 10 years, fair value | 13,489
Due after 10 years, fair value | 40,408
Total, fair value | $ 1,450,475

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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=82897076&loc=d3e27198-111563 + Details
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