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Schedule of Reported Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 745,498	$ 1,000,625
Available-for-sale marketable securities, Unrealized Gain	2,145	4,818
Available-for-sale marketable securities, Unrealized (Loss)	(4,019)	(867)
Available-for-sale marketable securities, Fair Market Value	743,624	1,004,576
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	601,660	583,076
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	478,306	533,833
Available-for-sale marketable securities, Unrealized Gain	38	99
Available-for-sale marketable securities, Unrealized (Loss)	(648)	(145)
Available-for-sale marketable securities, Fair Market Value	477,696	533,787
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	374,785	240,234
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	267,192	466,792
Available-for-sale marketable securities, Unrealized Gain	2,107	4,719
Available-for-sale marketable securities, Unrealized (Loss)	(3,371)	(722)
Available-for-sale marketable securities, Fair Market Value	265,928	470,789
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 226,875	$ 342,842

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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