Balance Sheet Components - Cash, Cash Equivalents and Short-Term and Long-Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Cash (1)	$ 345,119	$ 1,139,554
Money market funds	400,388	1,089,284
Certificates of Deposit, at Carrying Value	2,969	0
Total cash and cash equivalents	748,476	2,228,838	$ 610,917
Total marketable securities	13,451	17,459
Total cash, cash equivalents and short-term and long-term investments	761,927	2,246,297
Certificates of deposit
Investment Holdings [Line Items]
Total marketable securities	6,988	14,106
Total marketable securities
Investment Holdings [Line Items]
Total marketable securities	$ 6,463	$ 3,353

Total Cash, Cash Equivalents And Short-Term And Long-Term Investments

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

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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