Investments in Equity Interests (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Alibaba Group	Dec. 31, 2012 Alibaba Group	Oct. 23, 2005 Alibaba Group	Dec. 31, 2013 Yahoo Japan	Dec. 31, 2012 Yahoo Japan	Dec. 31, 2011 Yahoo Japan	Dec. 31, 2013 Other	Dec. 31, 2012 Other
Schedule of Equity Method Investments [Line Items]
Investment in equity interests	$ 3,426,347	$ 2,840,157	$ 1,018,126	$ 276,389		$ 2,399,590	$ 2,555,717		$ 8,631	$ 8,051
Percent ownership of common stock as of balance sheet date			24.00%	24.00%	46.00%	35.00%	35.00%	35.00%	19.00%	24.00%

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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 210.5-02.12)

-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 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

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Balance Type:	debit
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