Segment Information (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
Segment Reporting Information [Line Items]
Revenue	$ 1,265,795	[1]	$ 1,138,973	[2]	$ 1,135,244	[3]	$ 1,140,368	[4]	$ 1,345,807	[5]	$ 1,201,732	[6]	$ 1,217,794	[7]	$ 1,221,233	[8]	$ 4,680,380		$ 4,986,566		$ 4,984,199
TAC																	254,442		518,906		603,371
Revenue ex-TAC																	4,425,938		4,467,660		4,380,828
Global operating costs																	1,830,621	[10],[9]	1,672,070	[10],[9]	1,638,975	[10],[9]
Depreciation and amortization																	628,778		649,267		625,864
Goodwill impairment charge	63,555																63,555
Stock-based compensation expense																	278,220		224,365		203,958
Restructuring charges, net	8,000				4,000		(7,000)		77,000		25,000		129,000		6,000		3,766		236,170		24,420
Income from operations	174,218	[1]	92,759	[2]	136,979	[3]	185,970	[4]	189,990	[5]	152,189	[6]	54,813	[7]	169,376	[8]	589,926		566,368		800,341
Patents
Segment Reporting Information [Line Items]
Gains on sales of patents																	(79,950)
Americas
Segment Reporting Information [Line Items]
Revenue																	3,481,502		3,461,633		3,302,989
TAC																	158,974		182,511		160,110
Revenue ex-TAC																	3,322,528		3,279,122		3,142,879
Direct costs by segment																	747,684	[11]	733,316	[11]	696,103	[11]
Restructuring charges, net																	571		102,623
EMEA
Segment Reporting Information [Line Items]
Revenue																	385,186		472,061		629,383
TAC																	42,915		114,230		221,916
Revenue ex-TAC																	342,271		357,831		407,467
Direct costs by segment																	165,719	[11]	161,990	[11]	165,750	[11]
Goodwill impairment charge																	63,555	[12]
Restructuring charges, net																	2,862		45,360
Asia Pacific
Segment Reporting Information [Line Items]
Revenue																	813,692		1,052,872		1,051,827
TAC																	52,553		222,165		221,345
Revenue ex-TAC																	761,139		830,707		830,482
Direct costs by segment																	197,619	[11]	224,114	[11]	225,417	[11]
Restructuring charges, net																	$ 333		$ 88,187

[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.

[9] Global operating costs include product development, service engineering and operations, general and administrative, and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment. Prior to 2012, marketing and customer experience costs were managed on a global basis and included as global operating costs. Prior period amounts have been revised to conform to the current presentation.

[10] The net cost reimbursements from Microsoft pursuant to the Search Agreement are primarily included in global operating costs.

[11] Direct costs for each segment include cost of revenue-other, as well as other operating expenses that are directly attributable to the segment such as employee compensation expense (excluding stock-based compensation expense), local sales and marketing expenses, and facilities expenses. Beginning in 2012, marketing and customer experience costs are managed locally and included as direct costs for each segment. Prior period amounts have been revised to conform to the current presentation.

[12] Gross goodwill balances for the EMEA segment were $1.1 billion as of both January 1, 2012 and December 31, 2013. The EMEA segment includes accumulated impairment losses of $488 million as of January 1, 2012, and $551 million as of December 31, 2013.