Reconciliation Tax Computed by Applying Statutory Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]
Income tax at the U.S. federal statutory rate of 35 percent																	$ 221,648	$ 1,824,973	$ 289,630
State income taxes, net of federal benefit																	23,000	237,637	4,627
Stock-based compensation expense																	16,015	19,946	20,021
Research tax credits																	(18,036)		(10,499)
Effect of non-U.S. operations																	(47,968)	(138,078)	(49,781)
Settlement with tax authorities																	(46,943)	(4,711)	(14,685)
Remeasuresment of prior year tax positions																	(24,246)
Acquisition related non-deductible expenses																	9,296	1,894
Goodwill impairment charge																	22,244
Other																	(1,618)	(1,618)	2,454
Provision for income taxes	$ 41,498	[1]	$ 31,891	[2]	$ 50,267	[3]	$ 29,736	[4]	$ 83,007	[5]	$ 1,774,094	[6]	$ 26,523	[7]	$ 56,419	[8]	$ 153,392	$ 1,940,043	$ 241,767

[1] Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2013 includes a gain on the sale of patents of $70 million, a goodwill impairment charge of $64 million, and net restructuring charges of $8 million.

[2] Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2013 includes net restructuring reversals of less than $1 million.

[3] Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2013 includes net restructuring charges of $4 million.

[4] Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2013 includes net restructuring reversals of $7 million.

[5] Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2012 includes a one-time distribution of foreign earnings resulting in an overall net benefit of approximately $117 million and net restructuring charges of $77 million.

[6] Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2012 includes net restructuring charges of $25 million and pre-tax gain of $4.6 billion related to the sale of Alibaba Group Shares, which is included in other income, net.

[7] Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2012 includes net restructuring charges of $129 million.

[8] Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2012 includes net restructuring charges of $6 million.